CN104047280B - Soft foundation sharp separation compacting method - Google Patents
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Abstract
The present invention relates to a kind of soft foundation sharp separation compacting method, the method comprises the following steps that: step one, water-gas separation integrated tube well are arranged；Step 2, water and soil separation precipitation；After step 3, dynamic reinforcement, aqueous vapor separates construction；Step 4, backfill pipe well。This soft foundation sharp separation compacting method has employing water-gas separation integrated tube well precipitation in conjunction with dynamic reinforcement method, precipitation depth requirement can be reached, again can rapid dispersion because of after dynamic reinforcement produce pore water pressure, and be applicable to hypotonicity soil property dynamic reinforcement require advantage。
Description
Technical field
The present invention relates to a kind of soft-soil foundation treatment method, particularly relate to a kind of soft foundation sharp separation suitable in large-area soft foundation consolidation process and tamp method。It is applicable to place can not be met the place of the hydraulic fill sand mud of design bearing capacity and compactness, possession base processing technology field。
Background technology
At present, utilize method riverine, that Coastal beach passes through reclamation by pumping filling not enough to solve land used, due to new barged-in fill high-moisture, high rheological variation, high-compressibility, low-intensity。Hydraulic reclamation is difficult to enter plant equipment and launches subsequent construction after completing, for Accelerating The Construction speed, conventional well-points dewatering is in conjunction with the method for strong rammer, tube well dewatering binding site rammer and vacuum preloading, it mainly solves the problem that water content of soil is too high, by the method for well-points dewatering or tube well dewatering, to reduce water content of soil, so as to meet strong rammer technique, reach the purpose of consolidation process, improve bearing capacity and the compactness of the soil body。That is, in this all of reinforcement measure, reducing water content of soil is main purpose, only when the soil body meets dynamic reinforcement optimum moisture content, by dynamic reinforcement methods such as the multipass point rammer in strong rammer process, vibroroller cmpactings, to change soil body three high and one low soil property。The method reducing water content in the present soft soil foundation of China has Application of light well point precipitation, plastic draining board precipitation, tube well dewatering, and its Main Function reduces subsoil water exactly。
But in engineering practice, well-points dewatering is due to the restriction (general embedded depth only 6m) by well-point pipe length, therefore its precipitation depth is only about 2m, soft soil for below 2m, its water content cannot meet an optimum moisture content that rammer is required at all, and therefore, its reinforcement depth is typically only 4～6m, and the degree of compaction of the soil body along with reinforcement depth sharp-decay, so-called " crust layer " actually also only have about 4m；Conventional tube well dewatering is then the principle utilizing waterpower to release weight, its precipitation depth is determined along with pipe well placed-depth, generally can reach 5～6m, for a rammer, the compacting of the soil body is created condition, owing to the soft soil water content of its 5～6m meets a condition ramming compacting, therefore its reinforcement depth is according to engineering practice, generally can reach 7～8m, so on both precipitation methods, tube well dewatering is more suitable for the consolidation process of soft foundation in conjunction with dynamic compaction method。But owing to tube well dewatering belongs to free-draining, particularly when the process of large-area soft foundation, by in conjunction with heavy-tamping method, the dynamic reinforcements such as vibratory drilling method process, in applying these dynamic reinforcement processes, the impact that the soil body is applied by dynamic reinforcement, vibration pressure, excess pore water pressure can be produced, the soil body experiences destruction recovery process in the process of dynamic reinforcement, and tube well dewatering is owing to belonging to passive precipitation, when the soil body is under the impact and load pressure of dynamic reinforcement, the soil body produces super quiet pore water and super quiet pore pressure (being referred to as excess pore water pressure) because of deformation, particularly in an impact process rammed, in the soil body, excess pore water pressure is generally up to more than 50KPa, impulsive force is more high, the excess pore water pressure produced is more high, to flabbiness ground strengthened process, generally all take to hit less the principle of multipass, when adopting multipass point to ram, need to wait for this pressure dissipation to more than 90%, after allowing the soil body recover, just can carry out next to ram all over point。
Adopt vacuum well-point dewatering, by vacuum pump to the certain thickness evacuation of the soil body, in the soil body, super quiet pore pressure is discharged the soil body with super quiet pore water, but owing to its well point embedded depth is limited, the super quiet pore pressure of the subjacent bed soil body still cannot dissipate, its dissipation is dependent on slowly dissipating after pore water is entered well point by vacuum pump, therefore, vacuum well-point dewatering is in conjunction with the method for strong rammer, its tamping energy, ram number cannot improve, the super exactly quiet pore pressure of its reason is difficult to dissipate at earth's surface below 2m and causes, and put the tamping energy that rammer takes and directly influence the reinforcement depth of ground。
Tube well dewatering belongs to passive precipitation due to pipe well, and therefore, the excess pore pressure dissipation speed produced in the soil body after strong rammer is slower。Tube well dewatering is the principle precipitation utilizing waterpower to release weight, therefore unlike vacuum well-point dewatering, is made excess pore water pressure actively dissipate by vacuum pump (negative pressure) evacuation。For the soil property that the infiltration coefficients such as soft foundation particularly silty clay are little, its pore water pressure dissipation time length even cannot dissipate, and causes soil structures to destroy, soil structures once destruction, several months at least its convalescent period, more than 1 year at most。
It addition, the selection of precipitation method be according to soil coefficient of permeability K determine, according to soil coefficient of permeability K empirical value: vacuum well-point dewatering its be suitable in the soil layer that infiltration coefficient is K 0.1～50m/d, and tube well dewatering be applicable to infiltration coefficient be K 20～200m/d。Both precipitation methods are only applicable to the bigger sandy soil of infiltration coefficient, slity soil as can be seen here；And the soil layer of the soil property such as hypotonicity such as very soft sill clay, silty clay for coefficient of permeability K≤0.1m/d, then cannot be suitable for。
In sum；Though the pore water pressure that vacuum well-point dewatering energy rapid dispersion is because producing after dynamic reinforcement, but owing to its precipitation depth is limited, therefore it is only capable of the pore water pressure of dissipation shallow-layer；And though level of ground water can be down to below earth's surface 5～6m by tube well dewatering, but owing to tube well dewatering belongs to passive precipitation, the pore water pressure dissipation therefore produced after dynamic reinforcement is slow；The scope of application according to both precipitation methods, is only applicable to soil property above in the soil layer that infiltration coefficient is K 0.1～50m/d, and the soil property for coefficient of permeability K≤0.1m/d then cannot meet the precipitation requirement needed for dynamic reinforcement。
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency, one is provided to adopt water-gas separation integrated tube well precipitation in conjunction with dynamic reinforcement method, precipitation depth requirement can be reached, again can rapid dispersion because of after dynamic reinforcement produce pore water pressure, and be applicable to hypotonicity soil property dynamic reinforcement require soft foundation sharp separation compacting method。
The object of the present invention is achieved like this:
A kind of soft foundation sharp separation compacting method, the method comprises the following steps that:
Step one, water-gas separation integrated tube well are arranged
1.1, pipe well filter opening is set；
1.2, integrated tubes welding；
1.3, aqueous vapor separates balance control end layout；
1.4, integrated pipe well pattern network connects；
Step 2, water and soil separation precipitation
Integrated pipe well is properly functioning carries out water and soil separation precipitation, and level of ground water is down to below earth's surface 5～7m；
After step 3, dynamic reinforcement, aqueous vapor separates construction
3.1, first pass point is bulldozed after ramming and then carries out first pass aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
3.2, second time point is bulldozed after ramming and then carries out second time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
Step 4, backfill pipe well
4.1, pull out control end, take out the built-in immersible pump of integrated pipe well, utilize the weak soil of integrated pipe well periphery to insert in integrated pipe well；
4.2, after the backfill in fact of integrated pipe well, full rammer can be carried out and construct。
Wherein after step 3.2 also in steps 3.3 or after step 3.2 also in steps 3.3 and step 3.4；
3.3, the 3rd time point is bulldozed after ramming and then carries out the 3rd time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
3.4, the 4th time point is bulldozed after ramming and then carries out the 4th time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%。
Wherein in step 1.1, pipe well filter opening is arranged below from pipe well 2～3m suitable for reading。
Wherein in step 1.2, integrated tubes welding includes the layout of peripheral integrated pipe well and the layout of the integrated pipe well of internal layer, peripheral integrated pipe well is arranged in and needs reinforcing area periphery, peripheral integrated pipe well well spacing 10m or 15m, the integrated pipe well of internal layer is arranged in the middle of peripheral integrated pipe well, the integrated pipe well well spacing 15m of internal layer, the well spacing between peripheral integrated pipe well and the integrated pipe well of internal layer is 20～30m。
Step 1.3 wherein controls end include controlling end installation pipe, the top controlling end installation pipe arranges cover plate, cover plate arranges drain pipe, vacuum-pumping tube, immersible pump static line poling and vacuum conditions pipe, vacuum conditions pipe is provided with adjustment valve, the top of vacuum conditions pipe is provided with vacuum meter, control end installation pipe and insert integrated pipe well from upper end, cover plate is held on integrated pipe well top, the unsettled immersible pump that is hung in each integrated pipe well, connecting cable on immersible pump, cable is drawn control end by immersible pump static line poling and is connected with outside power supply, the discharge outlet of the immersible pump lower end by hose connection drain pipe, the upper end of drain pipe also connects flexible pipe。
Wherein also with the carrying out of aqueous vapor separation evacuation precipitation while the rammer of step 3 midpoint。
The invention has the beneficial effects as follows:
1, implement simply, applied widely
By evacuation and set up aqueous vapor and separate and control, selecting to apply different vacuum pressure according to soil condition, the soil layer making it to meet the hypotonicity such as very soft sill clay, silty clay carries out consolidation process；By the method that aqueous vapor separates, in the consolidation process process to large-area soft foundation, soil body excess pore pressure dissipation in consolidation process process can not only be accelerated, and it being applicable to the soil layer of the hypotonicity such as soil property such as very soft sill clay of coefficient of permeability K≤0.1m/d, the solid reinforcement for hypotonicity provides a kind of brand-new precipitation method。
2, the engineering time is short, and speed is fast, and cost is low
The present invention is compared with tradition Treatment Methods of Soft Ground, tube well dewatering, vacuum well-point dewatering are separated balance by aqueous vapor, three is made to integrate, can deep layer lowering of watertable, the pore pressure that can produce after rapid dispersion dynamic reinforcement again, change tradition Precipitation Model, the pore water pressure due to aqueous vapor separation rapid dispersion, only need the week age just to reach required flabbiness ground strengthened technology requirement in unit are construction；
3, deep layer precipitation, efficiency is high, and consolidation effect is obvious
Integrated pipe well water power releases the precipitation advantage of weight, vacuum well point evacuation, and aqueous vapor separates balance and controls adjustable three controlled big principles, the super quiet pore pressure that rapid dispersion soft foundation produces after dynamic reinforcement。Its precipitation depth and excess pore pressure dissipation thickness reach 5～7m, ensure that this thickness meets dynamic reinforcement, for improving strong rammer, the tamping energy of soft foundation is created condition, bearing capacity after this method consolidation process reaches 120KPa～150KPa, not only reach the effect that deep-layer reinforcing is closely knit, simultaneously for reducing settlement after construction, the bearing capacity improving soft foundation has established solid foundation。
4, once arrange that precipitation network can implement multipass dynamic reinforcement
This method arranges aqueous vapor separation pipe well grid according to the soil condition needing reinforcing area, after normal operation, desired depth is dropped to etc. level of ground water, when pore water pressure dissipation is to more than 90% (normally only needing 1～2 day time), can be entered next all over dynamic reinforcement construction, the soil property that infiltration coefficient is little, also can implement to ram while the technique of dissipation pore water pressure, to the decrease speed of the dissipation of pore water pressure and level of ground water faster, substantially the purpose of continuous dynamic reinforcement can be reached, solve soft foundation dynamic reinforcement process Pore Pressure to dissipate not easily, the soil body holds difficulty recovery time。
Therefore this soft foundation sharp separation compacting method has employing water-gas separation integrated tube well precipitation in conjunction with dynamic reinforcement method, precipitation depth requirement can be reached, again can rapid dispersion because of after dynamic reinforcement produce pore water pressure, and be applicable to hypotonicity soil property dynamic reinforcement require advantage。
Accompanying drawing explanation
Fig. 1 is water-gas separation integrated tube well horizontal layout schematic diagram of the present invention。
The aqueous vapor that Fig. 2 is the present invention separates the structural representation balancing control end。
Accompanying drawing labelling in figure:
Control end pipe 1, cover plate 2, drain pipe 3, vacuum-pumping tube 4, immersible pump static line poling 5, vacuum conditions pipe 6 to be installed, regulates valve 7, vacuum meter 8。
Detailed description of the invention:
A kind of soft foundation sharp separation compacting method (hereinafter referred to as separating compacting method), the method comprises the following steps that:
Step one, water-gas separation integrated tube well are arranged
Need reinforcing area to arrange water-gas separation integrated tube well according to geological conditions, adopting water-gas separation integrated tube well precipitation in conjunction with dynamic reinforcement method, by the free moisture in the soil body from discharge, reduce water content of soil, to meet the optimum moisture content needed for dynamic reinforcement。
The requirement that water-gas separation integrated tube well is arranged is as follows:
1.1, pipe well filter opening is set
Traditional tube well dewatering, its pipe well is generally adopted PVC ripple chimney filter, and from 1.5m suitable for reading pipe well filter opening arranged below, filter opening spacing is that 20cm geometric ratio from top to bottom row are arranged, until bottom pipe well；Pipe well filter opening then according to soil condition, can be arranged on the soil layer that infiltration coefficient is little arranging pipe well filter opening by this method。It is noted that the technique controlling end connection vacuum pump owing to taking aqueous vapor to separate, therefore pipe well filter opening need to from pipe well 2～3m suitable for reading can be positioned below simultaneously。Pipe well adopts iron pipe, pvc pipe and corrugated tube, sand filtration pipe etc., and the diameter of pipe well is generally 250mm。
1.2, the layout of water-gas separation integrated tube well (hereinafter referred to as integrated pipe well)
Referring to Fig. 1, integrated tubes welding includes the layout of peripheral integrated pipe well and the layout of the integrated pipe well of internal layer, integrated tubes welding network is determined according to the sand content index of place hydraulic reclamation thing, it is general when hydraulic reclamation thing sand content is less than 40%, integrated tubes welding network is 10 × 10m, when sand content is more than more than 40%, then integrated tubes welding network is 15 × 15m。Peripheral integrated pipe well is arranged in and needs reinforcing area periphery, peripheral integrated pipe well well spacing 10m or 15m, the integrated pipe well of internal layer is arranged in the middle of peripheral integrated pipe well, the integrated pipe well of internal layer arranges 1～2 row, the integrated pipe well well spacing 15m of internal layer, the well spacing between peripheral integrated pipe well and the integrated pipe well of internal layer is 20～30m。Can determine according to soil condition and level of ground water situation during practice of construction。
During practical application this method, the layout grid of integrated pipe well according to soil condition with needing reinforcement technique index, can be determined according to test。
1.3, aqueous vapor separates balance control end (hereinafter referred to as controlling end) layout
After integrated pipe well completes by determined network arrangement, install at integrated pipe well head and control end, referring to Fig. 2, control end to include controlling end installation pipe 1, the top controlling end installation pipe 1 arranges cover plate 2, arranging drain pipe 3, vacuum-pumping tube 4, cable immersible pump static line poling 5 and vacuum conditions pipe 6 that up/down perforation is arranged on cover plate 2, vacuum conditions pipe 6 is provided with adjustment valve 7, the top of vacuum conditions pipe 6 is provided with vacuum meter 8。The length controlling end installation pipe 1 is 500mm, and it is 300mm that drain pipe 3 stretches into the length controlled in end installation pipe 1。
Controlling end and install pipe 1 iron pipe making, its diameter, less than integrated pipe well internal diameter, controls end installation pipe 1 and inserts integrated pipe well from upper end, and cover plate 2 is circular cover, and the diameter of cover plate 2 is more than integrated pipe well internal diameter, and cover plate 2 is held on integrated pipe well top。Controlling end installation pipe 1 to be tightly connected with integrated pipe well, the place of being tightly connected uses winding film to be wound around sealing。
Integrated pipe well embedded depth is determined according to soil condition and level of ground water, generally can determine according to the water level decreasing value of designing requirement, and water level decreasing value is the 2/3 of integrated pipe well depth, and as required, water level decreasing reaches 6m, then pipe well embedded depth should be 9～10m。
The unsettled immersible pump that is hung in each integrated pipe well, immersible pump power adopts 0.75～2.2KW, and immersible pump is hung in integrated pipe well by rope and fixes, and its constant depth is determined according to the drawdown of designing requirement, when drawdown needs 6m, then immersible pump hangs deep in about 6m。Connecting cable on immersible pump, cable is drawn control end by immersible pump static line poling and is connected with outside power supply, the discharge outlet of the immersible pump lower end by hose connection drain pipe 3, the upper end of drain pipe 3 also connects flexible pipe, this flexible pipe passes in the open drain of pending foundation surface excavation, and waterproof geotextiles or waterproofing membrane are laid in the bottom in open drain。The upper end of vacuum-pumping tube 4 connects an evacuation house steward, and evacuation house steward carries out evacuation by external vacuum pump。
The operation principle of water-gas separation integrated tube well:
Vacuum pump carries out evacuation, vacuum pressure is formed in integrated pipe well, in integrated pipe well, vacuum pressure is shown by vacuum meter 8, according to gas-vapor mix situation in integrated pipe well, vacuum pressure in integrated pipe well is regulated by regulating valve 7, make vacuumizing effect adjustable controlled, to reach the excess pore water pressure that quickly the release soil body produces in dynamic reinforcement process, make the soil body shorten recovery time in dynamic reinforcement process。
1.4, integrated pipe well pattern network connects
After each integrated pipe well control end installation, the upper end of vacuum-pumping tube 4 connects an evacuation house steward, evacuation house steward carries out evacuation by external vacuum pump, a general vacuum pump connects 5～8 integrated pipe wells by evacuation house steward, its connected mode is, the pvc pipe adopting diameter 500mm is made evacuation house steward and is connected several integrated pipe well, by evacuation, house steward connects vacuum pump, the power of vacuum pump is more than 15KW, optimum is adopt reciprocating vacuum pump, because this equipment suction power is big, and it is operated in pure state of bleeding。
When evacuation house steward connects vacuum pump with integrated pipe well, then by the aboveground portion of integrated pipe being positioned by evacuation house steward, the port at integrated pipe well can be tied up with iron wire, vertical to guarantee integrated pipe well。
1.5, after integrated pipe well pattern network has connected, then can start vacuum pump, check interface tube and junction seal intact after carry out bailing test, when practice of construction, show according to vacuum meter and immersible pump drainage situation, debug in time, it is desirable to vacuum reaches 0.4～0.6MPa, the normal water outlet of immersible pump, to guarantee the normal operation of integrated pipe well。
Step 2, water and soil separation precipitation
After the normal water outlet of trail run, within about 1～2 day, level of ground water can be down to below earth's surface 5～7m, now in the soil body, Free water sharply declines, after the evacuation of vacuum pump gap, inside soil body divides Bound moisture to be sucked out the soil body to form Free water and be discharged, and water and soil separation precipitation vacuum pressure reaches 0.4～0.6Mpa。
After integrated pipe well is properly functioning, within about 1～2 day, level of ground water can be down to below earth's surface 5～7m, and vacuum well-point dewatering generally needs 7～10 days just can be down to earth's surface below 2m。
After step 3, dynamic reinforcement, aqueous vapor separates construction
The soil body is rammed through dynamic reinforcement, vibrating compacting time, the soil body produces super quiet pore pressure, and the energy (tamping energy) that its force value applies with power is directly proportional increase；In the soil body, Bound moisture forms super quiet pore water under ramming effect, and both are mixed into excess pore water pressure at (super quiet pore pressure and super quiet pore water), discharges press water (super quiet pore water) and pressure gas (super quiet pore pressure) in the soil body by this step。
The resolution time of pore water pressure is according to different soil properties, its resolution time is also different, substantial amounts of Construction practices proves, its resolution time of soil property that infiltration coefficient is more big is more short, wherein especially the fastest with medium coarse sand resolution time, normally only needing 48 hours, namely the excess pore water pressure after its rammer dissipates completely, can enter next all over dynamic reinforcement。And the soil property that infiltration coefficient is little, even if as very soft sill clay, silty clay etc. adopt vacuum well point to be aided with excess pore pressure dissipation, through the evacuation of month, also dissipation it is unable to reach, as continued dynamic reinforcement by force, its result is to occur that " spring soil " and causes soil structures to destroy, ends in failure。
And water-gas separation integrated tube well, comprehensive utilization waterpower releases restitution reason and vacuum well point evacuation sets up the aqueous vapor equilibrium principle in aqueous vapor separation equilibrium process, can not only quickly reduce subsoil water, and the pore water of energy soil body principle of balance generation after ramming and pore pressure, well inner pore pressure (malleation) is made to rise and be extracted out the soil body by vacuum pump, pore water in the soil body then flows in pipe well after balance, the soil body discharged by the immersible pump being built, different soil properties produced excess pore water pressure after dynamic reinforcement is different, water-gas separation integrated tube well is then by aqueous vapor separation balance adjustment, so as to the rapid dispersion of produced excess pore water pressure after meeting various soil mass dynamic reinforcement。Aqueous vapor separation precipitation vacuum pressure is determined according to soil condition, is generally 0.4～0.6Mpa。
3.1, first pass point is bulldozed after ramming and then carries out first pass aqueous vapor separation evacuation precipitation；
3.2, second time point is bulldozed after ramming and then carries out second time aqueous vapor separation evacuation precipitation；
Can according to circumstances set up after step 3.2
3.3, the 3rd time point is bulldozed after ramming and then carries out the 3rd time aqueous vapor separation evacuation precipitation；
Can according to circumstances set up after step 3.3
3.4, the 4th time point is bulldozed after ramming and then carries out the 4th time aqueous vapor separation evacuation precipitation；
Utilize excess pore water pressure (malleation) produced by gas-vapor mix state in the soil body, vacuum pump evacuation is connected by the control end arranged on integrated pipe well port, aqueous vapor separation balance control is carried out by regulating valve, can according to the pressure of excess pore water pressure produced by the soil body after dynamic reinforcement, utilize and regulate valve according to the soil condition adjustment vacuum needing reinforcing area, its vacuum of different soil properties is also different, make the gas-vapor mix liquid in the integrated pipe well of inflow by after regulating valve regulation vacuum pressure, water is down, gas is up, vacuum pump is bled and is not drawn water, alleviate the load pressure of vacuum pump。Inspection vacuum pump is tightly connected with integrated pipe well, when confirming errorless, opens vacuum pump and carries out aqueous vapor separation evacuation precipitation。The method generally taking gap evacuation, after 2～3 days, the super quiet pore pressure dissipation of the soil body is to more than 90%, and level of ground water drops to earth's surface 5～7m。
Step 4, backfill pipe well
4.1, control end is pulled out, take out the built-in immersible pump of integrated pipe well, the weak soil utilizing integrated pipe well periphery is inserted in integrated pipe well, should be noted while backfilling integrated pipe well in this link, employing is vibrated and is held in both hands limit backfill limit jolt ramming, put down until being backfilling into place, and carry out labelling at integrated pipe well place, take to mend rammer measure when full rammer to facilitate。
4.2, after the backfill in fact of integrated pipe well, full rammer can be carried out and construct, completely ram tamping energy and generally take 1000KN.m,
Completely ram construction requirement: ramming print overlap joint 1/4, every 1～2 is hit；Meet integrated pipe well mark point when implementing this method, then take the tamping energy that pipe well marks some 1000KN.m to click 5～6 and hit, carry out integrated pipe well point mending and ram, it is ensured that the degree of compaction of pipe well point。Full rammer terminates rear levelling of the land, finally detects after waiting pore pressure dissipation。
In sum, the flow process of whole soft foundation sharp separation compacting method is:
1, water-gas separation integrated tube well is arranged
2, water and soil separation precipitation
3, after dynamic reinforcement, aqueous vapor separates construction: multipass dynamic reinforcement and aqueous vapor separation precipitation, backfill pipe well, full rammer。
Adopt soft foundation sharp separation compacting method embodiment 1,
Step one, water-gas separation integrated tube well are arranged
The high-strength PVC corrugated tube that this example adopts water-gas separation integrated tube well diameter to be 2500mm, embedded depth is 10m, built-in 0.75KW immersible pump, and integrated pipe well arrangement technology is undertaken by Current Building ' job specfication；Integrated tubes welding sets peripheral integrated pipe well and the integrated pipe well of internal layer, peripheral integrated pipe well well spacing 10m, is arranged in and needs reinforcing area periphery；The integrated pipe well of internal layer is arranged on centre, well spacing 15m。
During practice of construction water-gas separation integrated tube well setting and arrange grid answer base area survey report disclose geological conditions determine。
In arranging integrated pipe well process, taking into full account and need reinforcing area subsoil water and soil property stratified condition, integrated pipe well filter opening is arranged on the shale silty clay that infiltration coefficient is less。
Step 2, water and soil separation precipitation
After integrated pipe well is properly functioning, within 1～2 day, namely level of ground water is down to below earth's surface 5～7m,
After step 3, dynamic reinforcement, aqueous vapor separates construction
3.1, first pass point is bulldozed after ramming and then carries out first pass aqueous vapor separation evacuation precipitation；
3.2, second time point is bulldozed after ramming and then carries out second time aqueous vapor separation evacuation precipitation；
Earth's surface below 5m is dropped in level of ground water, carry out first pass point rammer, first pass point rams tamping point and is arranged as 5 × 5m, the square layout of tamping point, tamping energy is 2500KN m, hitting for every 4～6, ceasing driving standard is: last two hit average ramming volume less than a front blow, and the last straw ramming volume is for being not more than 0.1m。Owing to this example needs reinforcing area soil property to be interlayer muck soil, therefore in a rammer process, integrated pipe well should keep normal precipitation。
First pass point is bulldozed after ramming and then carries out first pass aqueous vapor separation evacuation precipitation, take aqueous vapor Separation precipitation, until level of ground water drops to earth's surface below 5m, pore water pressure dissipation is to more than 90% (being generally 1～2 day), carry out second time point again to ram, second time tamping point is arranged in the middle of first pass, it is quincuncial arrangement with first pass tamping point, tamping energy is 2500KN m, hit for every 4～6, ceasing driving standard is: last two hit average ramming volume less than a front blow, the last straw ramming volume is for being not more than 0.1m, it is bulldozed after second time point rams and then carries out second time aqueous vapor separation evacuation precipitation, take aqueous vapor Separation precipitation, until level of ground water drops to earth's surface below 5m, pore water pressure dissipation is to more than 90% (being generally 1～2 day)。
Meet the soil layer of the hypotonicities such as soil condition difference very soft sill clay that particularly infiltration coefficient is little then water-gas separation integrated tube well properly functioning in ramming process when practice of construction process application this method, water-gas separation integrated tube well vacuum degree control is at about 0.6Mpa。To reach the purpose of rapid dispersion excess pore water pressure。
When practice of construction process application this method grid spacing and tamping energy, every ram number and all should determine according to the soil condition and instructions for use needing reinforcing area。
Step 4, backfill aqueous vapor separation pipe well,
Pull out aqueous vapor and separate control end, take out the built-in immersible pump of pipe well, utilize the weak soil of pipe well periphery to insert in pipe well, and with vibrator to pipe well backfill soil tamping。Should be noted while backfill pipe well in this link, adopt handful limit backfill limit jolt ramming of vibrating, put down until being backfilling into place, and carry out labelling, take to mend rammer measure when full rammer to facilitate。Carry out last to ram all over full, for guaranteeing the close compactness of rammer in pipe well, it is desirable to point rams workmen and meets pipe well point when full rammer, takes 1000KN m tamping energy, and every some complement 5～6 is hit；Full rammer prints overlap joint 1/4, and tamping energy is 1000KN m, and every 2 is hit, is bulldozed after rammer。
Implementing in tube well dewatering point rammer process, often descend water level decreasing value everywhere, every all over tamping energy, ram number and tamping point is arranged and reported expert engineer by construction party, subsequent processing construction can be carried out after the confirmation of expert engineer scene repetition measurement。
In this method implementation process, it is aided with information-based monitoring, the particularly monitoring of the ramming volume in level of ground water, the aqueous vapor separation balance vacuum meeting different soil and some rammer process, circumferential ridges amount and every pore water pressure dissipation between ramming in aqueous vapor separation process, by these information reflected in implementation process, provide technique adjustment for soft foundation aqueous vapor separation compacting method。
Claims (4)
1. a soft foundation sharp separation compacting method, it is characterised in that the method comprises the following steps that:
Step one, water-gas separation integrated tube well are arranged
1.1, pipe well filter opening is set,
Pipe well filter opening is arranged below from pipe well 2～3m suitable for reading；
1.2, integrated tubes welding；
Wherein in step 1.2, integrated tubes welding includes the layout of peripheral integrated pipe well and the layout of the integrated pipe well of internal layer, peripheral integrated pipe well is arranged in and needs reinforcing area periphery, peripheral integrated pipe well well spacing 10m or 15m, the integrated pipe well of internal layer is arranged in the middle of peripheral integrated pipe well, the integrated pipe well well spacing 15m of internal layer, the well spacing between peripheral integrated pipe well and the integrated pipe well of internal layer is 20～30m；
1.3, aqueous vapor separates balance control end layout；
1.4, integrated pipe well pattern network connects；
Step 2, water and soil separation precipitation
Integrated pipe well is properly functioning carries out water and soil separation precipitation, and level of ground water is down to below earth's surface 5～7m；
After step 3, dynamic reinforcement, aqueous vapor separates construction
3.1, first pass point is bulldozed after ramming and then carries out first pass aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
3.2, second time point is bulldozed after ramming and then carries out second time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
Step 4, backfill pipe well
4.1, pull out control end, take out the built-in immersible pump of integrated pipe well, utilize the weak soil of integrated pipe well periphery to insert in integrated pipe well；
4.2, after the backfill in fact of integrated pipe well, full rammer can be carried out and construct。
2. a kind of soft foundation sharp separation compacting method according to claim 1, it is characterised in that after step 3.2 also in steps 3.3 or after step 3.2 also in steps 3.3 and step 3.4；
3.3, the 3rd time point is bulldozed after ramming and then carries out the 3rd time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%；
3.4, the 4th time point is bulldozed after ramming and then carries out the 4th time aqueous vapor separation evacuation precipitation until pore water pressure dissipation is to more than 90%。
3. a kind of soft foundation sharp separation compacting method according to claim 1 and 2, it is characterized in that controlling end in step 1.3 includes controlling end installation pipe (1), the top controlling end installation pipe (1) arranges cover plate (2), cover plate (2) arranges drain pipe (3), vacuum-pumping tube (4), immersible pump static line poling (5) and vacuum conditions pipe (6), vacuum conditions pipe (6) is provided with adjustment valve (7), the top of vacuum conditions pipe (6) is provided with vacuum meter (8), control end installation pipe (1) and insert integrated pipe well from upper end, cover plate (2) is held on integrated pipe well top, the unsettled immersible pump that is hung in each integrated pipe well, connecting cable on immersible pump, cable is drawn control end by immersible pump static line poling (5) and is connected with outside power supply, the discharge outlet of the immersible pump lower end by hose connection drain pipe (3), the upper end of drain pipe (3) also connects flexible pipe。
4. a kind of soft foundation sharp separation compacting method according to claim 1 and 2, it is characterised in that also with the carrying out of aqueous vapor separation evacuation precipitation while the rammer of step 3 midpoint。
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| CN104452734B (en) * | 2014-11-12 | 2017-02-15 | 叶吉 | Rapid soft foundation separation preloading method |
| CN104480928B (en) * | 2014-11-12 | 2017-01-11 | 叶吉 | Separable grouting pre-pressing method for soft foundation |
| CN104790376B (en) * | 2015-04-10 | 2016-06-22 | 江苏澄工科技有限公司 | The modified sharp separation compacting method of soft foundation |
| CN110004869B (en) * | 2019-02-11 | 2023-11-14 | 中国水电基础局有限公司 | Device and method for rapidly reducing pore water pressure of filled soil body |
| CN110344388B (en) * | 2019-07-17 | 2020-12-01 | 中冶沈勘工程技术有限公司 | Design method for effective impact distance of ramming points for reinforcing saturated sandy soil foundation by dynamic compaction method |
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| CN1228494A (en) * | 1998-03-06 | 1999-09-15 | 张凌 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
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| CN1228494A (en) * | 1998-03-06 | 1999-09-15 | 张凌 | Vacuum deep well reinforcing method for large thickness soft soil foundation |
| JP2003239296A (en) * | 2002-02-12 | 2003-08-27 | Nishimatsu Constr Co Ltd | Pumping equipment and underground water level lowering device |
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