CN111101413B - A device and construction method for saline soil roadbed in seasonal frozen soil areas - Google Patents
A device and construction method for saline soil roadbed in seasonal frozen soil areas Download PDFInfo
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- CN111101413B CN111101413B CN202010079233.0A CN202010079233A CN111101413B CN 111101413 B CN111101413 B CN 111101413B CN 202010079233 A CN202010079233 A CN 202010079233A CN 111101413 B CN111101413 B CN 111101413B
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 26
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 24
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005056 compaction Methods 0.000 claims abstract description 32
- 238000005192 partition Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000004571 lime Substances 0.000 claims abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 26
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a device and a construction method applied to a saline soil roadbed in a seasonal frozen soil area, belongs to the technical field of roadbed foundations, and aims to solve the problems that the saline soil roadbed in the seasonal frozen soil area is prone to frost heaving, salt swelling and subsidence and the thickness of a bedding layer is not prone to compaction when traditional roadbed sand is used as a water permeability isolation layer. The device comprises an earthwork roadbed, a heat stabilizing facility and a partition facility, wherein the partition facility comprises a middle coarse sand lower protection layer, a modified desert sand partition layer and a middle coarse sand upper protection layer which are sequentially arranged from bottom to top, the heat stabilizing facility comprises a bottom roadbed stabilizing facility and an upper heat preservation facility, and the bottom roadbed stabilizing facility comprises a lime soil compaction pile and a lime soil cushion layer which are sequentially arranged from bottom to top. The method comprises the steps of construction of a bottom roadbed stabilization facility, construction of a partition facility, construction of an earthwork roadbed and an upper heat preservation facility, and construction of a peripheral waterproof wall. The invention can maintain the long-term water, heat and salt stability of the roadbed through the combination of the structure and the construction method, and has the advantages of low cost, few construction procedures and simple maintenance.
Description
Technical Field
The invention belongs to the technical field of roadbed foundations, and particularly relates to a device and a construction method applied to a saline soil roadbed in a seasonal frozen soil area.
Background
(1) Mechanism of dissolution and sinking, salt swelling and frost heaving of saline soil roadbed in seasonal frozen soil area:
The reasons of the salinized soil can be summarized as that the mother rock with drought climate, rare precipitation, strong evaporation and soil formation contains more salt, the distribution of northwest provinces in China is particularly wide, the northwest provinces are mostly located in seasonal frozen soil areas, and the thickness of the active layer is about 1.5m-2.0m; the method comprises the steps of carrying out a freeze thawing cycle on soil bodies in a range of a saline soil roadbed active layer in a seasonal frozen soil area, wherein the freeze thawing cycle is accompanied by various physical and chemical processes such as water salt migration, salt phase change and energy transmission, after the warm season is finished and the cold season is finished, the earth surface is frozen in the range of the whole active layer, the frozen surface is developed downwards, water migrates downwards towards the frozen surface, meanwhile, the salt migration is accompanied by the salt migration, when groundwater is active, the dissolution and the migration effects on soluble salts such as sodium chloride and sodium sulfate in the soil bodies are remarkable, the dissolution and the sinking diseases are easy to induce, after the soil bodies enter the warm season, the earth surface is melted, the frozen surface is transferred downwards, the water migrates downwards towards the frozen surface, meanwhile, the salt solution solubility is gradually improved, the precipitated crystals are melted, and the earth surface is subjected to repeated salt swelling, frost swelling and subsidence processes along with the alternate change of the temperature in the seasonal frozen soil area, the soil bodies are repeatedly swelled and loose, the soil bodies are caused to deform and destroy the soil bodies, the soil bodies are subjected to construction, the salt content is displayed, the salt content is high, the salt content is unstable, the soil bodies are unstable, and the salt content is unstable, and the salt is unstable and the deformed.
In order to relieve and prevent frost heave, salt heave and solving sink diseases of saline soil subgrade in a frozen region, the effective way is to control the processes of water and salt migration, salt phase change, energy transmission and the like in soil body.
(2) Measures for controlling water and salt migration in the prior art:
The traditional method for preventing and treating salt swelling and sinking diseases of the saline soil subgrade is to arrange a separation layer, wherein the separation layer is divided into a watertight separation layer and a permeable separation layer. The traditional waterproof partition layer is mainly geotextiles such as waterproof geotextile and waterproof board, geotextiles such as waterproof geotextile are easy to be punctured by particle fillers under the action of external load, temperature load and the like in a construction rolling stage or an operation stage, the service life is influenced and the like, and the water content distribution of soil bodies at the upper edge of one cloth-film is uneven as shown by on-site water monitoring data of a roadbed test section of the one cloth-film partition layer; the permeable separation layer is generally filled with gravel, aeolian sand, river sand or desert sand and other fillers with good water permeability, and the basic principle of the separation is that the thickness of the separation layer is greater than or equal to the rising height of brine capillary water, so that the separation effect is achieved.
However, gravel or river sand is used as a water-permeable isolating layer, so as to play a role in isolating, the capillary water of gravel soil and sand is strongly raised to a height of 40-110cm, more filler is needed, the method is suitable for a road section with a roadbed filled height of more than 1.8m and convenient material taking of the filler, the capillary water of aeolian sand is strongly raised to a height of 80-90cm, when the aeolian sand is used as the water-permeable isolating layer, the paving thickness is at least 90cm, the problems that the compactness is difficult to control, the filler requirement is large and the like exist, when the silty soil and the clay soil are used as the water-permeable isolating layer, the capillary water is strongly raised to a height of 200-400cm, if the silty soil and the clay soil contain more powder and clay, the powder and the clay exist, the film water exists among the powder and the clay, the salt migration can be accompanied, the secondary salinization is caused, and the isolating layer is gradually invalid, and the content of the powder and the clay is strictly controlled in the construction difficulty is high.
(3) Current state of the art regarding subgrade and stability:
In road engineering in frozen soil areas or seasonal frozen soil areas for many years, the heat preservation method is commonly used in frost heaving prevention roadbeds, and a heat preservation layer is paved in the roadbeds, so that the change range of a roadbed soil temperature field in the range of an active layer can be effectively reduced, and the heat preservation method has positive effects on preventing frost heaving, water seepage and thawing.
Materials used for roadbed heat preservation in the prior art mainly comprise Polyurethane (PU) plates, polystyrene foam (EPS) plates, extruded polystyrene foam (XPS) plates and the like, the performance indexes of the road engineering heat preservation materials are required to reach a certain standard, the heat resistance and the compression resistance of the XPS plates are superior to those of the PU plates and the EPS plates, but the mechanical properties of the XPS heat preservation plate materials and roadbed filling are large in difference, the thickness of the XPS heat preservation plates and the heat preservation effect are in positive correlation, but the thickness of the heat preservation plates is too large to influence the integral rigidity of roadbeds, the problem that deflection values exceed standards and the like possibly occurs, and the XPS heat preservation plates are difficult to popularize and apply.
The heat preservation of the side slope has proved to play a reaction role in the road engineering of the frozen soil area for many years, and when the heat preservation material of the side slope is applied in the construction of the frozen soil area in seasons, the heat preservation performance is poor when the heat preservation material of the side slope is used as the heat preservation material of the side slope, the heat preservation material of the side slope is found to be easy to slide downwards, bulges or stagger with local deformation, and the heat conductivity coefficient of asphalt expanded perlite, fine particle soil and living turf soil is bigger.
Because the saline soil roadbed in the seasonal frozen soil area is required to solve the problem of sinking caused by the dual reasons of frost heaving and salt heaving, the requirements of roadbed substrate stability are considered in substrate treatment, and the soaking pre-dissolving method, the filling method, the dynamic compaction method, the compaction pile method and the like in the prior art are obviously limited.
The method is suitable for soil layers with small thickness and large permeability coefficient, the effect of the dynamic compaction method for treating the saline soil foundation is quite unsatisfactory, the pile foundation construction process is various in pile foundation types, in saline soil areas, soil body pore water is rich in saline solution, the specific gravity is high, the viscosity is high, the drainage is very difficult and slow, the drainage period is long, the construction period is long, the compaction effect of gravel piles is quite unsatisfactory, chloride ions and sulfate which are rich in the saline soil have a certain corrosion effect on metal materials and concrete, and therefore, the method is not suitable for being applied to the foundation treatment in the saline soil areas in all of steel sheet piles, prefabricated square piles, immersed tube filling piles, CFG piles and bored filling piles.
Based on the problems in the background technology, the technical personnel in the field develop and develop a device and a construction method applied to the salty soil roadbed of the seasonal frozen soil region in the highway engineering construction of the northwest multi-region seasonal frozen soil region with the thickness of the active layer of about 1.5m-2.0 m.
Disclosure of Invention
The invention aims to provide a device applied to a salty soil roadbed in a seasonal frozen soil area, so as to solve the problems that the roadbed in the seasonal frozen soil area is easily subjected to frost heaving, salt swelling, dissolution and the like.
The invention further aims to provide a construction method of the device applied to the salty soil roadbed in the seasonal frozen soil area, so as to solve the problem that the thickness of the cushion layer is not easy to compact when the traditional roadbed sand is used as the water permeability isolation layer.
In order to solve the problems, the technical scheme of the invention is as follows:
The device comprises an earthwork roadbed, a heat stabilizing facility and a partition facility, wherein the partition facility comprises a middle coarse sand lower protection layer, a modified desert sand partition layer and a middle coarse sand upper protection layer which are sequentially arranged from bottom to top, the heat stabilizing facility comprises a bottom roadbed stabilizing facility and an upper heat preservation facility, the bottom roadbed stabilizing facility comprises a lime soil compaction pile and a lime soil cushion layer which are sequentially arranged from bottom to top, the lime soil cushion layer is positioned below the middle coarse sand lower protection layer, and the earthwork roadbed and a pavement are sequentially paved above the middle coarse sand upper protection layer.
Further, the system also comprises a hydro-thermal monitoring facility, wherein the hydro-thermal monitoring facility is distributed in a group every 10Km-50Km kilometers, the length of each group of hydro-thermal monitoring facility is 1.5m-2.5m, and the hydro-thermal monitoring facility is semi-amplitude distributed in the soil subgrade and the medium coarse sand upper protective layer along the road base.
Further, the horizontal arrangement interval of the hydrothermal probes is 1m, the vertical arrangement interval of the hydrothermal probes is 0.5m, one group of the hydrothermal probes is laid to a depth exceeding the bottom end of the soil compaction pile by 0.5m, and the rest groups of the hydrothermal probes are only laid in the soil subgrade and the middle coarse sand upper protective layer.
Further, the hydrothermal monitoring facility comprises a thermistor cable and a hydrothermal probe which are connected with each other, the thermistor cable is connected with a monitoring device, the monitoring device comprises an information collector and a power supply device which are connected with each other, and the power supply device is connected with the thermistor cable.
Further, the outside of the lime soil compaction pile is provided with a modified desert sand water-proof wall.
Further, the upper heat preservation facility comprises a bubble mixed light soil base layer and a heat preservation protection channel, wherein the bubble mixed light soil base layer is positioned above the earthwork roadbed and below the road surface, and the heat preservation protection channel is positioned on two sides of the earthwork roadbed.
Furthermore, two sides of the partition facility are provided with sand grain soil edge-covering areas with trapezoidal sections, and the sand grain soil edge-covering areas encapsulate the periphery of the middle coarse sand lower protective layer, the modified desert sand partition layer and the middle coarse sand upper protective layer.
Furthermore, the lime soil compaction pile adopts quincuncial piles.
Further, the power supply device comprises a solar storage battery and a solar panel which are connected with each other, and the solar storage battery is connected with the solar panel through an inverter.
The construction method of the device applied to the saline soil roadbed in the seasonal frozen soil area is characterized by comprising the following steps:
Step A, construction of a bottom roadbed stabilizing facility:
Firstly, carrying out surface cleaning treatment by using an excavator, wherein the treatment depth is not less than 0.3m, so as to ensure that humus soil is excavated;
The pile forming process includes setting pile machine, driving steel pipe to reach required design, feeding, drawing pipe, forming pile, pressing pile top, ramming and sealing, and leveling the base with road roller and land leveling machine to reach required flatness;
The paving thickness is controlled by a marker post method, a 5% lime soil cushion layer with the thickness of 30-50cm is paved, and the layers are compacted;
Drilling holes after pile forming, burying a group of hydrothermal monitoring facilities, ensuring that a lowest-position hydrothermal probe is positioned at a position of 0.5m at the bottom end of the soil compaction pile, and then fully compacting and leveling;
And B, construction of partition facilities:
filling sand grain soil edge-covering areas in a layering manner;
sequentially paving middle coarse sand lower protective layers with the thickness of 5 cm;
a modified desert sand isolation layer with the thickness of 3cm-5 cm;
a protective layer is arranged on the middle coarse sand with the thickness of 5cm, and a hydrothermal monitoring facility with the corresponding depth is buried in the layer during filling;
Layering, primary pressing, leveling, re-pressing and finally rolling the surface layer;
And C, construction of an earthwork subgrade and an upper heat preservation facility:
Filling and isolating the upper layer earth subgrade and the heat preservation protecting channel of the facility in a layered manner, performing full-width construction, and ensuring that the thickness of the loose pump is not more than 0.3m;
Paving a bubble mixed light soil base layer, and curing for 7 days according to the standard;
And D, peripheral waterproof wall construction:
building a modified desert sand water-proof wall, and fully compacting by a rammer;
e, pavement construction:
The standard requires the construction of pavement.
The beneficial effects of the invention are as follows:
(1) The invention is provided with a partition facility below an earthwork subgrade, utilizes modified desert sand as a watertight partition layer, has the characteristics of small paving thickness, easy compaction and convenient construction, has the characteristic of flexible self-repairing, belongs to a flexible self-repairing watertight layer, replaces the traditional aeolian sand large-thickness watertight partition layer, and is shown by data monitored on a test section paving site, wherein the modified desert sand partition layer can directly partition capillary water, soluble salt dissolved in the capillary water is partitioned at the same time, has remarkable water and salt isolation effect, and radically solves the problems of dissolution and secondary salinization.
(2) The heat-stabilizing facility comprises a bottom roadbed stabilizing facility and an upper heat-preserving facility, wherein the upper heat-preserving facility is arranged above and around an earth roadbed, in a seasonal frozen soil area, the thickness of an active layer is about 1.5m-2.0m, the good heat-preserving facility can ensure that the earth roadbed is temporarily frozen in severe winter, the problem of subsidence after frost heaving and salt swelling of the lower roadbed is solved from the root, bubble mixed lightweight soil is selected as a heat-preserving layer paved above the earth roadbed, the density is smaller than that of common concrete, the strength and the rigidity are even better than those of a soil body, the heat conductivity coefficient, the strength and the density can be adjusted, the heat conductivity coefficient can be reduced by adjusting the density under the conditions of meeting the strength and the durability, the heat-insulating property is improved, the bubble mixed lightweight soil is high in porosity, the heat conductivity is small, the shock resistance, the heat insulation and the freeze thawing resistance can be good, the fluidity, the water retention property and the workability are good after the mixed according to a certain mixing proportion, the construction is convenient, the initial curing strength and the high-stability and the heat-insulating property of the cement aggregate can meet the requirements of the heat-insulating layer and the heat-insulating property.
In seasonal frozen soil areas, building heat-insulating protection channels, when the thickness of the side slope heat-insulating protection channels is larger than that of the movable layer, the ground temperature of the roadbed outside the widening section is always positive, the range of the movable layer outside the widening section can be reduced, the occurrence and development of frozen swelling, salt swelling and thawing diseases of the roadbed are controlled, and the problem of soil body expansion caused by salt phase change is avoided.
As the upper heat preservation facility of the seasonal frozen soil area, the combination of the bubble mixed light soil and the heat preservation protecting channel is used, the data monitored on the test section laying site shows that the good heat stabilizing effect can be achieved, and the data detected on the test section site is confirmed in construction.
The method is characterized in that a bottom layer roadbed stabilizing facility is paved below the middle coarse sand lower protective layer, the combination of a lime soil compaction pile and a lime soil cushion layer is selected by the bottom layer roadbed stabilizing facility, the characteristics of saline soil in a seasonal frozen soil area are specially considered, the factors such as compaction effect, water consumption, heat supply and the like are considered, the lime soil compaction pile can react and consume water to release heat and expand in volume in construction, a quincuncial pile group reacts with lower foundation soil, water absorption, expansion and compaction can obviously improve the bearing capacity of a substrate, the released large amount of reaction heat has positive effects on the thermal stability of the upper roadbed, and the combined lime soil cushion layer can ensure that the lower redundant capillary water is absorbed in later use, so that the application effect is good.
(3) The hydrothermal probe in the hydrothermal monitoring facility can timely detect the hydrothermal current situation of an earthwork roadbed and the corresponding position below the earthwork roadbed, data are collected, the monitoring is convenient, solar power supply is adopted integrally, the hydraulic monitoring facility is more suitable for the current situation of a salty soil road section in a northwest seasonal frozen soil area, a half-width road width is adopted in a paving mode, a group of hydraulic monitoring facilities are generally arranged at one end of a hillside every 10Km-50Km kilometers in consideration of freezing depth, flexible adjustment is carried out according to the geological situation of a construction site road section, when the geological structure similarity of the construction site road section is higher, the arrangement interval is widened, when the geological structure similarity of the construction site road section is low and the situation above a road surface is complex, the arrangement interval is shortened, the hydrothermal monitoring facility can monitor the hydrothermal situation inside the roadbed in real time, monitor abnormality in time, long-term healthy operation of the salty soil area road in the frozen region is guaranteed, and modules with the function of forecasting of the hydrothermal abnormality situation can be additionally arranged according to requirements, and intelligent monitoring is achieved.
(4) The method is characterized in that the middle coarse sand lower protective layer, the modified desert sand isolation layer and the middle coarse sand upper protective layer are covered by layered filling sand soil, layered construction, laying and compaction are carried out, the stability of the middle coarse sand lower protective layer, the modified desert sand isolation layer and the middle coarse sand upper protective layer is guaranteed, meanwhile, the earthwork roadbed and the thermal insulation protection channel are integrally laid, the stability of the thermal insulation protection channel is guaranteed, the integrated construction process is few, the cost is low, and finally, the modified desert sand isolation wall is built, so that migration of water and salt on two sides of the roadbed is further prevented, and the stability of the roadbed is comprehensively guaranteed.
(5) The invention aims at the problems of salt swelling, frost heaving, sinking and the like induced by the processes of water salt migration, salt phase change, energy transmission and the like in a saline soil subgrade in a seasonal frozen soil area, can effectively separate underground capillary water and soluble salt from upward migration through the combination of a structure and a construction method, effectively control the processes of salt phase change, energy transmission and the like, achieves the effects of water absorption, hot filling, expansion compaction and the like on a lower substrate, maintains the long-term water, heat and salt stability of roadbed soil, monitors the water and heat conditions of the roadbed in time, and has the advantages that the related component materials are common geotechnical materials, the construction cost is low, the construction procedures are few, the later maintenance is simple, the construction of the whole facility and the roadbed construction are simultaneously carried out, and the long-term healthy operation effect of the constructed highway is remarkable.
Drawings
FIG. 1 is a schematic structural view of an apparatus for applying to a salty soil subgrade in a seasonal frozen soil zone;
Fig. 2 is a top view of fig. 1.
The device comprises a light soil base layer mixed by bubbles, a heat preservation protecting channel, a lime soil cushion layer, a 4-lime soil compaction pile, a 5-modified desert sand separating layer, a 6-medium coarse sand upper protective layer, a 7-medium coarse sand lower protective layer, a 8-modified desert sand water-proof wall, a 9-sand soil edge covering area, a 10-thermistor cable, a 11-hydrothermal probe, a 12-monitoring device, a 13-information collector, a 14-power supply device, a 15-road surface, a 16-earth subgrade.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
As shown in fig. 1-2, an apparatus for application to a salty soil subgrade in a seasonal frozen soil zone comprises an earthmoving subgrade 16, a heat stabilizing facility, a partition facility, and a hydrothermal monitoring facility.
The partition facility comprises a middle coarse sand lower protective layer 7, a modified desert sand partition layer 5 and a middle coarse sand upper protective layer 6 which are sequentially arranged from bottom to top, wherein sand grain soil edge-covering areas 9 with trapezoid cross sections are arranged on two sides of the partition facility, and the periphery of the middle coarse sand lower protective layer 7, the modified desert sand partition layer 5 and the middle coarse sand upper protective layer 6 are encapsulated in the sand grain soil edge-covering areas 9.
The heat stabilizing facilities comprise a bottom roadbed stabilizing facility and an upper heat preservation facility:
The bottom roadbed stabilizing facility comprises a lime soil compaction pile 4 and a lime soil cushion layer 3 which are sequentially arranged from bottom to top, wherein the lime soil cushion layer 3 is positioned below a middle coarse sand lower protection layer 7, an earthwork roadbed 16 and a pavement 15 are sequentially paved above the middle coarse sand upper protection layer 6, the lime soil compaction pile 4 adopts quincuncial piles, and a modified desert sand water-proof wall 8 is arranged on the outer side of the lime soil compaction pile 4.
The upper heat insulation facility comprises a bubble mixed light soil base layer 1 and a heat insulation protecting channel 2, wherein the bubble mixed light soil base layer 1 is positioned above an earthwork roadbed 16 and below a road surface 15, and the heat insulation protecting channel 2 is positioned on two sides of the earthwork roadbed 16.
The hydrothermal monitoring facility comprises a thermistor cable 10 and a hydrothermal probe 11 which are connected with each other, the thermistor cable 10 is connected with a monitoring device 12, the monitoring device 12 comprises an information collector 13 and a power supply device 14 which are connected with each other, the power supply device 14 is connected with the thermistor cable 10, the power supply device 14 comprises a solar storage battery and a solar panel which are connected with each other, and the solar storage battery is connected with the solar panel through an inverter.
The hydrothermal monitoring facilities are distributed in a group every 10Km-50Km kilometers, the length of each group of the hydrothermal monitoring facilities is 1.5m-2.5m, the hydrothermal monitoring facilities are distributed in the earthwork roadbed 16 and the middle coarse sand upper protection layer 6 along the road base in a half-width mode, the horizontal distribution interval of the hydrothermal probes 11 is 1m, the vertical distribution interval of the hydrothermal probes 11 is 0.5m, the distribution depth of one group of the hydrothermal probes 11 exceeds the bottom end of the lime soil compaction pile 4 by 0.5m, and the rest groups of the hydrothermal probes 11 are only distributed in the earthwork roadbed 16 and the middle coarse sand upper protection layer 6.
The construction method of the device applied to the saline soil roadbed in the seasonal frozen soil area comprises the following steps:
Step A, construction of a bottom roadbed stabilizing facility:
firstly, carrying out surface cleaning treatment by using an excavator, wherein the treatment depth is determined according to geological conditions of a construction site, so as to ensure that humus soil is excavated, and the treatment depth in construction is not less than 0.3m;
The pile forming process includes setting pile machine, driving steel pipe to reach required design, feeding, drawing pipe, forming pile, pressing pile top, ramming and sealing, and leveling the base with road roller and land leveling machine to reach required flatness;
The paving thickness is controlled by a standard pole method, 5% lime soil cushion layer 3 is paved, the layers are compacted, the paving thickness is determined according to the geological conditions of a construction site, and the paving thickness is generally 30cm-50cm;
Drilling holes after pile forming, burying a group of hydrothermal monitoring facilities, ensuring that a lowest-position hydrothermal probe is positioned at 0.5m of the bottom end of the ash soil compaction pile 4, and then fully compacting and leveling;
And B, construction of partition facilities:
filling a sand soil edge-covering area 6 in a layering manner;
Paving middle coarse sand lower protective layers 7 with the thickness of 5cm in sequence;
a modified desert sand partition layer 5 with the thickness of 3cm-5 cm;
A 5cm thick middle coarse sand upper protective layer 6, and a hydrothermal monitoring facility with a corresponding depth is buried in the layer during filling;
The thickness of the modified desert sand isolation layer 5 is determined according to the geological conditions of the construction site, when the underground capillary water and the salt content are high, the paving thickness of the modified desert sand isolation layer 5 is properly increased, otherwise, the paving thickness reaches 3cm, so that the isolation can be realized, and the construction cost is lower;
Layering, primary pressing, leveling, re-pressing and finally rolling the surface layer;
And C, construction of an earthwork subgrade and an upper heat preservation facility:
The soil subgrade 16 and the heat preservation protecting channel 2 on the upper layer of the layered filling partition facility are constructed in full width, and the thickness of the loose pump is ensured not to exceed 0.3m;
Paving a bubble mixed light soil base layer 1, and curing for 7 days according to the standard;
And D, peripheral waterproof wall construction:
building a modified desert sand water-proof wall 8, and fully compacting by a rammer;
e, pavement construction:
The standard requires the construction of a pavement 15.
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