CN204898658U - Be used for consolidating little biological glue knot sand pile of soft soil foundation - Google Patents

Be used for consolidating little biological glue knot sand pile of soft soil foundation Download PDF

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Publication number
CN204898658U
CN204898658U CN201520436878.XU CN201520436878U CN204898658U CN 204898658 U CN204898658 U CN 204898658U CN 201520436878 U CN201520436878 U CN 201520436878U CN 204898658 U CN204898658 U CN 204898658U
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China
Prior art keywords
sand
pile
sand pile
microorganism
cementing
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Expired - Fee Related
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CN201520436878.XU
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Chinese (zh)
Inventor
王安辉
余沛
王玉雅
韩守杰
高庆敏
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Shangqiu Institute of Technology
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Shangqiu Institute of Technology
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Abstract

The utility model discloses a be used for consolidating little biological glue knot sand pile of soft soil foundation combines together the sand pile technique with microorganism grout technique, form little biological glue knot sand pile, consolidates the soft soil foundation, and the pile body includes sand material and microorganism thick liquid. The construction flow of biological glue knot sand pile includes a little: A. Leveling of ground measures the laying -out, B. The pore -forming is crept into to stake machine location, C. Descend the slip casting pipe, throw in the sand material, D. Fill fungus liquid and glued solution in proper order. The induced calcite gel that forms of microorganism becomes whole with loose sand grain gluing, effectively improves the intensity of pile body, higher porosity and permeability can be maintain to glued sand body simultaneously, and a drainage of accelerateing stake week soil is concretied. Little biological glue knot sand pile can obviously improve the engineering properties of soft foundation soil, effectively improves the bearing capacity of soft base, has simultaneously that the construction is simple and convenient, the construction disturbance is little, advantages such as intensity can regulation and control, energy saving and emission reduction, ecological environmental protection, can popularize and apply in weak soil foundation stabilization engineering.

Description

The cementing sand pile of a kind of microorganism in order to reinforcing soft ground
Technical field
The utility model belongs to geotechnical engineering ground stabilization field, relates to the cementing sand pile of a kind of microorganism in order to reinforcing soft ground.
Background technology
Cement, lime and chemical grouting material are cementitious material the most conventional in soil stabilization.But the traditional cementitious material such as cement, lime can change the pH value of the soil body, make the soil body be alkalescence and form the erosion environment of certain limit, all bad impact can be caused on underground water and surrounding vegetation, and also can discharge a large amount of greenhouse gases in cement production process, its shortcoming such as high energy consumption, high pollution discharge existed, will certainly constitute a serious threat to ecological environment.For chemical grouting material, except water glass, all chemical grouting materials (epoxy resin, Acrylates, phenolic resins class, polyurethanes etc.) are all poisonous.Thus, the novel gelled material of research energy-saving and emission-reduction, ecological, environmental protective, economical and efficient, function admirable is significant.
Microorganism consolidation by grouting technology is a kind of novel soil stabilization method that latest developments are got up, by pouring into bacterium liquid and nutrient solution in loosening sand, utilize microorganism induction calcite precipitation (MICP) to act between sand particle and separate out calcite gel fast, improve the physico-mechanical properties of sand body.Existing result of study shows, MICP grouting technique effectively can improve the intensity of sand, rigidity, anti-liquefaction and erosion-resisting characteristics etc., and cementing sand body still can maintain higher porosity and permeability within the scope of some strength.Microorganism grouting agent is solution or suspension, compared with traditional cementitious material, have that stickiness is low, good fluidity, permeability be strong, reaction rate and cementing strength controllable, the advantage such as low in the pollution of the environment, belong to low energy consumption, low emission material.Thus, microorganism grouting technique, as a kind of soil stabilization new method of sustainable development, has potential engineering practical value and application prospect widely.
Sand pile method originates from the Europe of the 1830's, starts from the fifties in the application of China.Sand pile is for the treatment of loosening sand ground at first, is used for gradually afterwards processing weak cohesive soil.Engineering practice shows, sand pile method process loosening sand and the not high unsaturated rockmass ground of index of plasticity, and it is compacted or close effect of shaking is better, not only can improve bearing capacity of foundation soil, reduce foundation settlement, can also prevent methods of sand liquefaction.During sand pile process saturated soft clay foundation, mainly utilize the metathesis of sand pile and drainage to improve the stability of soft foundation, but because sand pile pile body is bulk solid, strength of the mixing pile is lower, and the natural structure of bury can be destroyed in vibration formation of pile, reduce its shear strength, thus, still can there is larger sedimentation and deformation in the soft clay ground after sand pile process under load action.
In order to improve the validity of sand pile in process soft clay foundation, the application of expansion microorganism grouting technique in soil stabilization, microorganism grouting being combined with sand pile, gives full play to both advantages, thus effective consolidation process soft foundation.
Utility model content
Technical problem: microorganism grouting is applied in sand pile technology by the utility model, one is provided to improve strength of the mixing pile, overcome the shortcomings such as conventional cement grouting injection pressure is high, construction disturbance is large, diffusion length is little, eco-compatibility is poor, and sand pile can be kept as vertical drainage passage (selective absorption because of microorganism), accelerate the cementing sand pile of the microorganism in order to reinforcing soft ground of stake week bury consolidation settlement.
Technical scheme: the cementing sand pile of the microorganism in order to reinforcing soft ground of the present utility model, comprises boring and fills with sand pile, be perfused with bacterium liquid and cementing solution (urea and CaCl in sand pile 2mixed liquor).According to the stake footpath of design, with engineering driller pore-forming to desired depth position, then insert steel grouting tube, subsequently to throwing in the sand material of certain grating in stake holes to absolute altitude, utilize Grouting Pipe in hole, pour into bacterium liquid and cementing solution successively, and regulate and control the intensity of pile body by repeatedly cycle grouting.
In a kind of preferred version of the cementing sand pile of the utility model microorganism, sand pile stake footpath D=0.3 ~ 0.7m, in quincuncial arrangement, pile center is apart from L=2.0 ~ 3.0D, and stake is long, depends on the thickness of soft soil needing consolidation process, should within 30m; Sand material particle diameter d=50 ~ 400 μm, cementing solution concentration ω=0.5 ~ 1.0mol/L.
The comprehensive sand pile method of the utility model and microorganism grouting technique, form the cementing sand pile of microorganism, carry out consolidation process to soft clay foundation.Pile body comprises sand material and microorganism slurries (bacterium liquid and cementing solution), by pouring into bacterium liquid and cementing solution in sand pile successively, the calcite gel with cementation can be generated fast between sand particle, and the entirety formed by loosen loose sand seed lac for having certain mechanical property, thus reach the object improving sand pile intensity.Meanwhile, cementing sand body still can maintain higher porosity and permeability within the scope of some strength, thus accelerates the discharging consolidation of bury around, improves the physico-mechanical properties of inter-pile soil.The utility model not only remains the advantage of sand pile method soft soil foundation, and overcoming the major defect of sand pile method and cementation, its beneficial effect is: 1) microorganism perfusion sand pile, and construction disturbance is little, grouting pressure is low, do not cause surrounding soil displacement, do not affect surrounding building; 2) grouting agent is solution or suspension, and its viscosity is very low, good fluidity, and perfusion distance can reach more than 5m; 3) eco-compatibility is good, and microorganism itself all has no adverse effects to environment and human body, and finally only has nature mineral calcite to retain in sand pile; 4) repeatedly cycle grouting can be realized, be regulated and controled the strength and stiffness (unconfined compression strength of sand pile can reach 300kPa ~ 30MPa) of cementing pile body by different perfusion number of times; 5) solidify cementing speed, and without the need to maintenance, in general 5 ~ 10d, enough intensity can be reached; 6) cementing sand body still can maintain higher porosity in a few MPa strength range, less to the Permeability of pile body; 7) adopt engineering driller rotating circulating bored pile, compared to sand compaction pile construction, to ground and surrounding environment disturbance little, and construction operation is easy, vibrate in construction little, noise is low.The utility model easy construction and easily promoting, can improve the intensity of pile body greatly, can accelerate again the discharging consolidation of stake week bury, and feasibility in Soft foundation treatment of expansion sand pile method and microorganism grouting technique and validity, have broad application prospects.
accompanying drawing illustrates:
Fig. 1 is construction flow chart of the present utility model.
Fig. 2 is sand pile layout plan of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail.The soft foundation related in the utility model refers to by mud, mucky soil, soft dredger fill and miscellaneous fill, or other high-compressibilities, hypotonicity soft layer form ground.
The cementing sand pile of microorganism in order to reinforcing soft ground, pile body comprises sand material and microorganism slurries (bacterium liquid and cementing solution), and its Specific construction flow process is:
1) smooth location, determine center, drilled pile position, pile position deviation is not more than ± 20mm, and aperture section buries the long steel pile casting for 1m underground; Driller insertion centering, its kelly, brill disk center should be consistent with pile center, and drilling rod is vertical, and gradient should be less than 1%.
2) by design stake footpath and the long drilling and forming hole of stake, adopt the large pump amount direct circulation working system boring of mud off, creep into projected depth, the revolution of drilling tool original position, direct circulation punching deslagging.
3) slip casting steel floral tube is transferred at the bottom of hole, and aim at drill center position, then filled out in hole by tumbling barrel and fill with sand material to aperture absolute altitude, in input sand material process, the hole flushing of Grouting Pipe injected clear water should be utilized incessantly.
4) in steel floral tube, insert the slip casting core pipe with two-way locking device, by hoisting grouting core pipe, pour into bacterium liquid and cementing solution in sand pile successively, bacterium liquid is a kind of Bacillus pasteurii of high urease-producing, and cementing solution is urea and CaCl 2mixed liquor, its concentration should be 0.5 ~ 1.0mol/L, grouting adopt subsectin bottler mode from bottom to top.
5) carry out repeatedly cycle grouting according to strength of the mixing pile designing requirement, twice grouting is no less than 6h interval time, after all grouting terminates, extracts Grouting Pipe, and fills the hole in pile body by cement mortar, can complete a cementing sandy pile construction of microorganism.
The cementing sand pile of microorganism of the present utility model is that in the method according to the cementing sand pile reinforcing soft ground of mentioned microorganism, step 1) obtains to step 5) construction.Protection domain of the present utility model is not limited with detailed description of the invention, but is limited by claim.

Claims (3)

1. in order to the cementing sand pile of microorganism of reinforcing soft ground, it is characterized in that: this cementing sand pile comprises boring and fills with sand pile, and be perfused with bacterium liquid and cementing solution in sand pile, its cementing solution is urea and CaCl 2mixed liquor.
2. the cementing sand pile of a kind of microorganism in order to reinforcing soft ground according to claim 1, it is characterized in that: described sand pile is quincuncial arrangement, stake footpath D=0.3 ~ 0.7m, pile center is apart from L=2.0 ~ 3.0D, stake is long, depends on the thickness of soft soil needing consolidation process, should within 30m, sand material particle diameter is preferably d=50 ~ 400 μm.
3. the cementing sand pile of a kind of microorganism in order to reinforcing soft ground according to claim 1, is characterized in that: described bacterium liquid is a kind of Bacillus pasteurii of high urease-producing, and cementing solution is urea and CaCl 2mixed liquor, its concentration is preferably ω=0.5 ~ 1.0mol/L, and bacterium liquid and cementing solution should pour in sand pile successively, and can repeatedly circumfusion.
CN201520436878.XU 2015-06-24 2015-06-24 Be used for consolidating little biological glue knot sand pile of soft soil foundation Expired - Fee Related CN204898658U (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105649003A (en) * 2016-01-11 2016-06-08 河海大学 Reinforcing device for reinforcing sand foundation through combination of microorganisms with vacuum drainage and reinforcing method of reinforcing device
CN106284280A (en) * 2016-09-18 2017-01-04 东南大学 A kind of method utilizing microorganism to prepare calcium carbonate solidification sand
CN106353480A (en) * 2016-08-10 2017-01-25 天津大学 Method for testing microbe cemented fine-grained soil under negative pressure
CN106906821A (en) * 2017-03-09 2017-06-30 方祥位 A kind of microorganism sand pile pile-forming apparatus and method
CN108004161A (en) * 2017-11-30 2018-05-08 河海大学 A kind of method and its microorganism reinforcing liquid that liquid prevention bump at bridgehead is reinforced using microorganism
CN109139014A (en) * 2018-10-29 2019-01-04 六盘水师范学院 Top gob-side entry retaining method is cut in a kind of perforation presplitting
CN109356176A (en) * 2018-11-15 2019-02-19 河海大学 A kind of method for reinforcing side slope for reinforcing liquid based on plant urase
CN109797734A (en) * 2019-01-14 2019-05-24 南京大学(苏州)高新技术研究院 A kind of prevention and control of soil erosion method based on microbial mineralization effect
CN110130318A (en) * 2019-05-24 2019-08-16 南京林业大学 A kind of construction method of microorganism mixing-filling stake
CN111501455A (en) * 2020-04-23 2020-08-07 山东交通学院 Construction process for reinforcing roadbed by combining biological enzyme curing material with cured powder soil roadbed and compacted sand piles
CN111535306A (en) * 2020-05-15 2020-08-14 北华航天工业学院 Microbial curing method and irrigation and drainage device suitable for marine soft soil foundation
CN111764960A (en) * 2020-08-17 2020-10-13 六盘水师范学院 Coal mining separation layer water damage prevention and control method
CN112211176A (en) * 2019-07-10 2021-01-12 广东工业大学 Microorganism grouting and drainage curing pile and construction method and application thereof
CN111764960B (en) * 2020-08-17 2021-11-12 六盘水师范学院 Coal mining separation layer water damage prevention and control method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105649003A (en) * 2016-01-11 2016-06-08 河海大学 Reinforcing device for reinforcing sand foundation through combination of microorganisms with vacuum drainage and reinforcing method of reinforcing device
CN106353480A (en) * 2016-08-10 2017-01-25 天津大学 Method for testing microbe cemented fine-grained soil under negative pressure
CN106284280A (en) * 2016-09-18 2017-01-04 东南大学 A kind of method utilizing microorganism to prepare calcium carbonate solidification sand
CN106284280B (en) * 2016-09-18 2019-10-11 东南大学 A method of calcium carbonate solidification sand is prepared using microorganism
CN106906821A (en) * 2017-03-09 2017-06-30 方祥位 A kind of microorganism sand pile pile-forming apparatus and method
CN108004161A (en) * 2017-11-30 2018-05-08 河海大学 A kind of method and its microorganism reinforcing liquid that liquid prevention bump at bridgehead is reinforced using microorganism
CN109139014B (en) * 2018-10-29 2020-03-10 六盘水师范学院 Perforation presplitting roof cutting gob-side entry retaining method
CN109139014A (en) * 2018-10-29 2019-01-04 六盘水师范学院 Top gob-side entry retaining method is cut in a kind of perforation presplitting
CN109356176A (en) * 2018-11-15 2019-02-19 河海大学 A kind of method for reinforcing side slope for reinforcing liquid based on plant urase
CN109797734A (en) * 2019-01-14 2019-05-24 南京大学(苏州)高新技术研究院 A kind of prevention and control of soil erosion method based on microbial mineralization effect
CN110130318A (en) * 2019-05-24 2019-08-16 南京林业大学 A kind of construction method of microorganism mixing-filling stake
CN112211176A (en) * 2019-07-10 2021-01-12 广东工业大学 Microorganism grouting and drainage curing pile and construction method and application thereof
CN111501455A (en) * 2020-04-23 2020-08-07 山东交通学院 Construction process for reinforcing roadbed by combining biological enzyme curing material with cured powder soil roadbed and compacted sand piles
CN111535306A (en) * 2020-05-15 2020-08-14 北华航天工业学院 Microbial curing method and irrigation and drainage device suitable for marine soft soil foundation
CN111764960A (en) * 2020-08-17 2020-10-13 六盘水师范学院 Coal mining separation layer water damage prevention and control method
CN111764960B (en) * 2020-08-17 2021-11-12 六盘水师范学院 Coal mining separation layer water damage prevention and control method

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CF01 Termination of patent right due to non-payment of annual fee

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