CN104032736B - The construction method of cement mixing method in Coral Reef Rock stratum - Google Patents
The construction method of cement mixing method in Coral Reef Rock stratum Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 108
- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 90
- 244000132059 Carica parviflora Species 0.000 title claims abstract description 83
- 238000002156 mixing Methods 0.000 title claims abstract description 57
- 239000004568 cement Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000005516 engineering process Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 17
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- 238000007906 compression Methods 0.000 claims description 17
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- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 238000000205 computational method Methods 0.000 claims description 2
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- 230000000694 effects Effects 0.000 description 2
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- 239000011398 Portland cement Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention provides the construction method of cement mixing method in a kind of Coral Reef Rock stratum, relate to Geotechnical Engineering technique of design and construction field. For in the construction of Coral Reef Rock stratum water-stop curtain, can utilize three axle mixing pile machines stir construction and how to take effective construction method to make the construction of cement mixing method there is the problem of operability it. Construction method: one, set up agitatability analysis and evaluation model according to the agitatability level value on Coral Reef Rock stratum, divide the agitatability rank on Coral Reef Rock stratum; Two, the agitatability level value of calculating Coral Reef Rock stratum in pre-construction site, judges the agitatability rank that it is corresponding, selects corresponding construction technology, is determined construction technology and is verified its pile quality by test pile; Three, test pile quality reaches after designing requirement, carries out the construction of cement mixing method by definite construction technology. Ensure operability and the construction quality of cement-soil stirring pile construction.
Description
Technical field
The present invention relates to Geotechnical Engineering technique of design and construction field, particularly a kind of Coral Reef Rock geologyUnder condition, the construction method of cement mixing method in water seepage prevention fender body.
Background technology
In base pit engineering, for ensureing the safety of base pit engineering and surrounding enviroment thereof, need design and construction onlyWater curtain, water-stop curtain is flow into foundation ditch and take in order to stop or to reduce underground water at the bottom of foundation pit side-wall and foundation ditchContinuous water-stop body. Under conventional formation condition, for example, be less than 3Mpa at sandy soils and uniaxial compressive strengthSoft Rock Area, generally adopt diaxon or three axle mixing pile machines to carry out the construction of water-stop curtain.
Due to the needs of engineering construction, some engineering project must be built under complicated geological condition near sea. FaceSea complex geological condition refers to: typical stratigraphic section can be summarized as three layers from top to bottom, as shown in Figure 2, onLayer 1 is taking flour sand, medium coarse sand as main, and its top is miscellaneous fill, and upper strata 1 includes a large amount of coral reef chips and coralCoral coral rock 4, infiltration coefficient is large, is 10E-3～10E-4(cm/s); Middle level 2 is strong weathered granite, layerThickly rise and fall and change greatlyr with bedrock surface, infiltration coefficient is larger, is 10E-5(cm/s) left and right, part is containedLarge block granite boulder; Lower floor 3 is middle weathered granite, and infiltration coefficient is little, can be considered aquicludeOr water barrier, bedrock surface big rise and fall.
In the above-mentioned engineering construction place with complicated geological condition near sea, 1 stratum, upper strata is containing a large amount of coral reefsCan chip and Coral Reef Rock, although Coral Reef Rock hardness is not high, utilize three conventional axle mixing pilesMachine stirs construction to it and there is no method and accurately judge, secondly, and while utilizing three axle mixing pile machines constructions, howTake measures on customs clearance to avoid " embrace and bore " and stir the unequal situation that is unfavorable for construction to occur also to require study.Visible, under complicated geological condition near sea, how to take effective construction method, make water in water-stop curtainThe construction of earth mixing pile has operability, and ensures that its construction quality is that those skilled in the art need solution badlyProblem certainly.
Summary of the invention
For in the construction of the foundation pit waterproof curtain on Coral Reef Rock stratum, can utilize three conventional axles to stirMix a machine and it is stirred to construction there is no method and accurately judge, and how to take effective construction method to makeIn water-stop curtain, the construction of cement mixing method has the problem of operability, the object of this invention is to provide oneThe construction method of cement mixing method in kind of Coral Reef Rock stratum, can be according to Coral Reef Rock stratum canStirring property rank is selected the construction technology of corresponding highly effective, economical rationality, and then ensures Soil-cementThe operability of pile driving construction and construction quality thereof.
The present invention solves the construction party of cement mixing method in the Coral Reef Rock stratum that its technical problem adoptsMethod, step is as follows:
Step 1: set up agitatability analysis and comment according to the agitatability level value on described Coral Reef Rock stratumValency model, the agitatability rank of dividing described Coral Reef Rock stratum;
Step 2: calculate the agitatability level value on described Coral Reef Rock stratum in pre-construction site, judge itCorresponding described agitatability rank, selects corresponding construction technology, determines described construction technology by test pileAnd verify its pile quality;
Step 3: described test pile quality reaches after designing requirement, the described construction work of determining by described step 2Skill is carried out the construction of described cement mixing method;
The computational methods of described agitatability level value are as follows:
Step a, in the sampling of described Coral Reef Rock earth-boring, by the saturated compression test of single shaft, determine fullTerminal compression strength of the single axle value σ with described Coral Reef Rock stratum under statec；
Step b, the described terminal compression strength of the single axle value σ that described step a is obtainedcSubstitution agitatability levelValue equation obtains the agitatability level value on described Coral Reef Rock stratum, and described agitatability level value equation is:
Kjb＝0.6073+2.08Lnσc
Wherein, KjbFor the agitatability level value on described Coral Reef Rock stratum, it is dimensionless numerical value;
σcFor the terminal compression strength of the single axle value on described Coral Reef Rock stratum under saturation state, unit is Mpa.
Further, in described step 1, described agitatability partition of the level is I, II, III, tetra-portions of IVPoint, wherein,
The agitatability rank of part i is easily to stir, and its corresponding agitatability level value is 0～4;
The agitatability rank of part ii is for stirring, and its corresponding agitatability level value is 4～6;
The difficult stirring of agitatability rank of III part, its corresponding agitatability level value is 6～8;
The agitatability rank of IV part is for stirring, and its corresponding agitatability level value is > 8.
In the time that agitatability rank is part i, described in employing single shaft mixing pile machine or Double shaft stirring stake machine carry outThe construction of cement mixing method.
In the time can stirring rank and be part ii, adopt three axle mixing pile machines to carry out described cement mixing methodConstruction.
In the time can stirring rank and be III part or IV part, adopt Punching Borehole Cast-in-place Concrete Pile machine and according to TRDEngineering method is carried out the construction of described cement mixing method.
Preferably, in described step 2, described cement mixing method adopts secondary water-spray type slurry and secondary to repeatThe construction technology stirring, the drill bit of controlling described three axle mixing pile machines creeps into mixing speed and is less than 0.5m/min,And ensure grouting pressure, until described drill bit is through described Coral Reef Rock stratum.
Preferably, the hoisting velocity that described Coral Reef Rock stratum is repeated to stir is 1.0m/min～2.0m/min。
Preferably, in the time that described cement mortar can not continue to inject described Coral Reef Rock stratum, make described drill bitContinuous firing, and spray into clear water until described cement mortar recovers to inject in boring.
More excellent, in the work progress of described cement mixing method, in described boring, add cement mortar to useThe bentonite lubricating additive of amount 3%～5%.
Effect of the present invention is:
One, the construction method of cement mixing method in Coral Reef Rock of the present invention stratum, for containing a large amount of coralsThe engineering construction place on coral reef chip and Coral Reef Rock stratum, first stirring according to Coral Reef Rock stratumMixing property level value is set up agitatability analysis and evaluation model, secondly, determines the Coral Reef Rock of pre-construction siteThe agitatability rank on stratum, then, for different agitatability ranks, selects corresponding construction equipmentAnd construction parameter, formulate Cement Mixing Pile Construction Technology, construction equipment and the construction technology pin of economical rationalityStrong to property, avoid blindly adopting conventional equipment to cause " embrace and bore " and cement mortar and Coral Reef Rock to be stirredMix the generation of uneven phenomenon; In addition, also can avoid the unnecessary consumption of equipment and manpower, and then ensure coralOperability and the construction quality thereof of cement-soil stirring pile construction in coral coral rock stratum.
Two, the construction method of cement mixing method in Coral Reef Rock of the present invention stratum, tries into according to sceneStake, and Rock And Soil laboratory test in on-the-spot geotechnical investigation report and the data of on-the-spot field in-situ test are dividedAnalyse, and the terminal compression strength of the single axle on Coral Reef Rock stratum under saturation state, and with reference to rock mass drillabilityClassification research, draws agitatability level value equation and agitatability partition of the level standard by mathematical statistics matching,Can analyze the terminal compression strength of the single axle value of different Coral Reef Rocks, and by agitatability levelThe agitatability feature of the soft rocks such as value reflection Coral Reef Rock, agitatability rank classification determination methods directly perceived andBe easy to grasp, be convenient to take corresponding construction technology according to different geological conditions, shoot the arrow at the target, both ensuredConstruction quality, has improved again efficiency of construction.
Brief description of the drawings
Fig. 1 is the curve map of Coral Reef Rock stratum agitatability rank in one embodiment of the invention;
Fig. 2 to Fig. 4 is the construction schematic diagram of cement mixing method in Coral Reef Rock stratum in one embodiment of the invention;Fig. 5 is the construction process figure of cement mixing method in one embodiment of the invention.
Detailed description of the invention
Soil-cement in Coral Reef Rock stratum the present invention being proposed below in conjunction with the drawings and specific embodimentsThe construction method of stake is described in further detail. According to explanation and claims below, of the present invention excellentPoint and feature will be clearer. Below will by cited embodiment by reference to the accompanying drawings, describe skill of the present invention in detailArt content and feature. Need explanation in addition, accompanying drawing all adopts the form of simplifying very much and all uses non-accurateRatio, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Embodiment mono-: cement mixing method in Coral Reef Rock of the present invention stratum is described in conjunction with Fig. 1 to Fig. 5Construction method, the present embodiment is taking the engineering construction place on the Coral Reef Rock stratum of bordering on the sea as example, concrete stepsAs follows:
S101: set up agitatability analysis and evaluation model according to the agitatability level value on Coral Reef Rock stratum,As shown in Figure 1, divide the agitatability rank on Coral Reef Rock stratum;
S102: calculate the agitatability level value on Coral Reef Rock stratum in pre-construction work construction place, judgementThe agitatability rank that it is corresponding, select corresponding construction technology, determines cement mixing method by test pileConstruction technology is also verified pile quality, by the full stake of cement mixing method pile body long drilled holes being got to core, inspectionThe length of pile pile body, uniformity, and obtain the uniaxial compressive strength of sample by compression test, to checkCan strength of the mixing pile meet design requirement.
S103: after test pile quality meets design requirement, carry out cement according to the construction technology that step S102 is definiteThe construction of soil mixing pile.
The construction method of cement mixing method in Coral Reef Rock of the present invention stratum, for containing a large amount of coral reefsThe engineering construction place on chip and Coral Reef Rock stratum, first according to the agitatability on Coral Reef Rock stratumLevel value is set up agitatability analysis and evaluation model, secondly, determines the Coral Reef Rock stratum of pre-construction siteAgitatability rank, then, for different agitatability ranks, select corresponding construction equipment and executeWork parameter, formulates Cement Mixing Pile Construction Technology, construction equipment and the construction technology specific aim of economical rationalityAvoid blindly adopting conventional equipment to cause " embrace and bore " and cement mortar and Coral Reef Rock to be stirred not by force,All generations of phenomenon; In addition, also can avoid the unnecessary consumption of equipment and manpower, and then ensure coral reefThe operability of cement-soil stirring pile construction and construction quality thereof in limestone formation.
In above-mentioned steps S101, according to the agitatability level value on Coral Reef Rock stratum, divide Coral Reef RockThe agitatability rank on stratum is I, II, III, tetra-parts of IV, and as shown in Figure 1, in figure, x axle represents to satisfyTerminal compression strength of the single axle value σ with Coral Reef Rock stratum under statec, what y axle represented Coral Reef Rock canStirring property level value;
Wherein, the agitatability rank of part i is easily to stir, and its corresponding agitatability level value is 0～4;
The agitatability rank of part ii is for stirring, and its corresponding agitatability level value is 4～6;
The difficult stirring of agitatability rank of III part, its corresponding agitatability level value is 6～8;
The agitatability rank of IV part is for stirring, and its corresponding agitatability level value is > 8.
Further, the agitatability level value in above-mentioned steps S101 and S102 is to calculate by the following methodDraw, concrete steps are as follows:
Step a, carry out drill hole sampling on Coral Reef Rock stratum, by the saturated compression test of indoor single shaft, reallyDetermine the terminal compression strength of the single axle value σ of the core on Coral Reef Rock stratum under saturation statec; The resistance to compression of the single shaft limitIntensity is under unidirectional pressurized condition, limit value of compressive stress when rock sample destroys, and test obtains the single shaft utmost pointLimit compression strength value σcStatistical value many in 3.5Mpa～9.0Mpa interval, generally, σc≤5Mpa。
Step b, the terminal compression strength of the single axle value σ that step a is obtainedcSubstitution agitatability level value equation obtainsGo out the agitatability level value on Coral Reef Rock stratum, above-mentioned agitatability level value equation is:
Kjb＝0.6073+2.08Lnσc
Wherein, KjbFor the agitatability level value on Coral Reef Rock stratum, it is dimensionless numerical value;
σcFor the terminal compression strength of the single axle value on Coral Reef Rock stratum under saturation state, unit is Mpa.
In sum, construction method of the present invention is tried pile according to scene, and in the report of on-the-spot geotechnical investigationThe Rock And Soil laboratory test (soil body: shear strength test; Coral Reef Rock test block: saturated single shaft resistance to compression examinationTest) and the on-the-spot field in-situ test (soil body: mark passes through and hits number, cone penetration test; Coral Reef Rock: markPass through test, original position shearing test) data analysis, and the single shaft on Coral Reef Rock stratum under saturation stateCompressive ultimate strength, and with reference to the research of rock mass Grades of Drillability, draw above-mentioned stirring by mathematical statistics matchingMixing property level value equation and agitatability partition of the level standard, can be to the single shaft limit of different Coral Reef RocksCompression strength value σ c analyzes, and stirring by soft rocks such as agitatability level value reflection Coral Reef RocksProperty feature, agitatability rank classification determination methods is directly perceived and be easy to grasp, and is convenient to according to different geology barsPart is taked corresponding construction technology, shoots the arrow at the target, and has both ensured construction quality, has improved again efficiency of construction.
Specifically,, in the time that Coral Reef Rock stratum agitatability rank is part i, adopt single shaft mixing pileMachine or Double shaft stirring stake machine are constructed.
In the time that Coral Reef Rock stratum can be stirred rank and is part ii, adopt three axle mixing pile machines to construct,The whitewashing of diaxon rotating Vortex and the Coral Reef Rock mix of three axle mixing pile machines, the reverse high-pressure jet of axis is in holeIn with the soil cement mix of fully stirring, and because the gas of axis high pressure ejection is in Coral Reef Rock stratumReverse upset, makes the soil body of original mix more even, and expanded diameter is more effective, and consolidation effect is more excellent.
In the time that Coral Reef Rock stratum can be stirred rank and is III part or IV part, adopt punching perfusionStake machine is also constructed according to TRD engineering method. TRD engineering method (Trench-Cutting&Re-mixingDeepWallMethod, i.e. mix and blend wall type construction of diaphragm wall method) be to cut meeting having of projected depthThe cutting box insertion of cutting chain and cutter head is underground, in carrying out the longitudinally horizontal propelling of cutting grooving, toThe inner injected water mud of ground, to reach and the abundant mix and blend of original state ground, connects in underground formation equal thicknessA kind of construction technology of continuous wall.
As shown in Figures 2 to 4, according to geotechnical engineering investigation report, the present embodiment engineering construction place is saturatedUnder state, the uniaxial compressive strength average on Coral Reef Rock stratum 4 is 6.2Mpa, according to agitatability level value sideThe agitatability level value that journey calculates Coral Reef Rock stratum 4 is 4.4, according to above-mentioned agitatability rankGrade scale, can be classified as the stirred rank of part ii, and taking corresponding construction equipment is that three axles stirMix a machine 5, take corresponding construction parameter and construction technology as follows: the employing the second gunite secondary again mode of stirring is executedWork, cement mixing method 6 joint forms, for socket one hole method, adopt the general silicon portland cement of P.O42.5, waterGray scale 1.2, cement mixing content is 20%, requires 28 days unconfined compressive strengths to be not less than 0.8MPa.
First, in the early-stage preparations stage of construction, except need are prepared normal triaxial mixing pile construction material requestedAnd apparatus, also should be equipped with at the scene the power supply units such as generator, prevent from waiting because having a power failure in work progress not trueDetermining cause element and cause the generation of " embrace and bore " phenomenon, Grout-jetting pipe is condensed by cement mortar; In above-mentioned steps S102,As shown in Figure 3 and Figure 4, in the time that three axle mixing pile machines 5 are met Coral Reef Rock stratum 4, control three axles and stirThe mixing speed of creeping into of stake machine 5 is less than 0.5m/min, and slow down bit speed, and ensure grouting pressure, untilThrough Coral Reef Rock stratum 4, make cement mortar and Coral Reef Rock uniform stirring.
In order to improve pile quality and the intensity of cement mixing method 6, can be to there is Coral Reef Rock stratum 4Region carry out one or many repeat stir, repeat stir hoisting velocity be generally 1.0m/min～2.0m/min. Point repeat mixing-filling in stake bottom, hoisting velocity is unsuitable too fast, avoid occurring negative pressure of vacuum,The phenomenons such as hole wall landslide.
For ensureing the continuity of work progress, in the time that cement mortar can not continue to inject Coral Reef Rock stratum 4,Need make drill bit continuous firing, and spray into clear water until cement mortar recovers to inject in boring.
In the work progress of cement mixing method 6, in boring, add the swelling of cement mortar consumption 3%～5%The additive of the lubricities such as soil, to strengthen the lubricity in drilling process, thereby reduces on Coral Reef Rock groundThe resistance of layer 4 construction. It should be noted that, above-mentioned construction method of the present invention only also can be applicable to other antiseepagesIn the design and construction of water fender body, be not limited to this.
For can the border on the sea agitatability on Coral Reef Rock stratum and pile quality of checking the present embodiment meet and establishMeter requirement, through examination pile, according to cement mixing method 6 boring and corings are detected, and to drying regimeAnd uniaxial compressive strength test interpretation of result under saturation state is known:
1, saturated uniaxial compressive strength still dry compression strength all exceeded foundation pit waterproof curtain and initially establishedEvaluation 1.5Mpa, has reached the requirement of foundation pit waterproof curtain bearing capacity.
2, the obtained cement earth pile core nothing within the scope of same depth in same foundation pit waterproof curtain difference positionConfined compressive strength gap is less, is illustrated as quality of pile stable.
3, the obtained cement earth pile core in different foundation pit waterproof curtain differences position within the scope of same depth without sideLimit compression strength value is also very approaching, is being less than within the scope of 4m, and stake core saturation intensity value is lower, is less than 3Mpa;Within the scope of 4～15m, stake core saturation intensity value is higher, all higher than 3Mpa.
4, cement earth pile core unconfined compressive strength, in test specification, increases with buried depth, and analysis canKnow, because groundwater level depth is greater than 1.5m, and coral chip concrete dynamic modulus, water absorbing capacity is better, soPile body top cement grout is not given full play to strength of cement, and moisture abundance in the soil body of bottom, strength of cementPerformance fully.
5, a full stake long drilled holes is got core and is shown, pile body stirs, and pile body is complete.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention,Any change, modification that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, all belong to powerThe protection domain of profit claim.
Claims (9)
1. the construction method of cement mixing method in Coral Reef Rock stratum, step is as follows:
Step 1: set up agitatability analysis and comment according to the agitatability level value on described Coral Reef Rock stratumValency model, the agitatability rank of dividing described Coral Reef Rock stratum;
Step 2: calculate the agitatability level value on described Coral Reef Rock stratum in pre-construction site, judge itCorresponding described agitatability rank, selects corresponding construction technology, determines described construction technology by test pileAnd verify its pile quality;
Step 3: described pile quality reaches after designing requirement, the described construction work of determining by described step 2Skill is carried out the construction of described cement mixing method;
The computational methods of described agitatability level value are as follows:
Step a, in the sampling of described Coral Reef Rock earth-boring, by the saturated compression test of single shaft, determine fullTerminal compression strength of the single axle value σ with described Coral Reef Rock stratum under statec；
Step b, the described terminal compression strength of the single axle value σ that described step a is obtainedcSubstitution agitatability levelValue equation obtains the agitatability level value on described Coral Reef Rock stratum, and described agitatability level value equation is:
Kjb＝0.6073+2.08Lnσc
Wherein, KjbFor the agitatability level value on described Coral Reef Rock stratum, it is dimensionless numerical value;
σcFor the terminal compression strength of the single axle value on described Coral Reef Rock stratum under saturation state, unit is Mpa.
2. construction method according to claim 1, is characterized in that, in described step 1, and described stirringProperty partition of the level is I, II, III, tetra-parts of IV, wherein,
The agitatability rank of part i is easily to stir, and its corresponding agitatability level value is 0～4;
The agitatability rank of part ii is for stirring, and its corresponding agitatability level value is 4～6;
The difficult stirring of agitatability rank of III part, its corresponding agitatability level value is 6～8;
The agitatability rank of IV part is for stirring, and its corresponding agitatability level value is > 8.
3. construction method according to claim 2, is characterized in that, when agitatability rank is part iTime, adopt single shaft mixing pile machine or Double shaft stirring stake machine to carry out the construction of described cement mixing method.
4. construction method according to claim 2, is characterized in that, in the time can stirring rank and be part ii,Adopt three axle mixing pile machines to carry out the construction of described cement mixing method.
5. construction method according to claim 2, is characterized in that, is III part when stirring rankOr when IV part, adopt Punching Borehole Cast-in-place Concrete Pile machine and carry out described cement mixing method according to TRD engineering methodConstruction.
6. construction method according to claim 4, is characterized in that: in described step 2, and described soil cementMixing pile adopts secondary water-spray type slurry and secondary to repeat the construction technology stirring, and controls described three axle mixing pile machinesDrill bit creep into mixing speed and be less than 0.5m/min, and ensure grouting pressure, until described in described drill bit passesCoral Reef Rock stratum.
7. construction method according to claim 6, is characterized in that: described Coral Reef Rock stratum is carried outThe hoisting velocity that repeats to stir is 1.0m/min～2.0m/min.
8. construction method according to claim 6, is characterized in that: when described cement mortar can not continue to inject, make described drill bit continuous firing when on described Coral Reef Rock the stratum, and to boring in spray into clear water until described inCement mortar recovers to inject.
9. construction method according to claim 8, is characterized in that: in the construction of described cement mixing methodIn process, to the bentonite lubricating additive that adds cement mortar consumption 3%～5% in described boring.
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| CN104866664B (en) * | 2015-05-19 | 2018-05-25 | 上海市建工设计研究总院有限公司 | A kind of Impermeable underground wall curtain body construction difficulty Forecasting Methodology |
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