CN107119670A - A kind of solid indigenous method in microorganism negative pressure surface - Google Patents
A kind of solid indigenous method in microorganism negative pressure surface Download PDFInfo
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- CN107119670A CN107119670A CN201710396335.3A CN201710396335A CN107119670A CN 107119670 A CN107119670 A CN 107119670A CN 201710396335 A CN201710396335 A CN 201710396335A CN 107119670 A CN107119670 A CN 107119670A
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- soil
- mass consolidation
- soil mass
- negative tube
- vavuum pump
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
Abstract
The method of the solid soil in microorganism negative pressure surface, step includes：A. treating that 10~20cm of below the surface of soil mass consolidation 4 buries negative tube 1, line-spacing 20cm forms negative pressure pipe network；B. microbial inoculum is sprayed onto and treats the surface of soil mass consolidation 4, vavuum pump 3 is opened simultaneously, and the air and Pore Solution treated in soil mass consolidation 4 are extracted by negative tube 1, acceleration treats that the microbial inoculum on the surface of soil mass consolidation 4 is infiltrated, and closes vavuum pump 3 when having bacterium solution to enter negative tube 1, stands 4~8h；C. by the cementing spray solution prepared in advance to treating the surface of soil mass consolidation 4, then open vavuum pump 3 and the air and Pore Solution treated in soil mass consolidation 4 are extracted by negative tube 1, making treating around negative tube 1, soil mass consolidation 4 is in unsaturated state, when saturation degree is reduced to 25%, vavuum pump 3 is closed, 12h is stood；D. repeat step b, c is until treat that solid soil strength meets reinforcement criteria.
Description
Technical field
The present invention relates to a kind of method of the solid soil in microorganism negative pressure surface, belong to the technical field of soil body surface reinforcing.
Background technology
Microorganism soil-fixing technology is ecological, the environmentally friendly solid indigenous method of a class, and existing microorganism soil-fixing method, which is mainly, to be passed through
Microbial inoculum and consolidating fluid are injected, admix or spray, using microorganism induction calcium carbonate crystal technology (MICP technologies), finally
The cementing soil particle of calcium carbonate crystal is separated out in hole between soil particle.The CaCO of microorganism induction deposition3Crystalline solid has cementing
With the effect of filling, the soil body can be reinforced effectively.It can be used for foundation stabilization, stability of slope and protection, water in current engineering
In terms of soil is kept.The intergranular cohesion of the loose grounds such as sand, silt is weak, anti-water erosion and wind erosion ability, the exposed soil body
Incident soil erosion problem.The solid soil of antimicrobial surface is to prevent microorganism induction calcium carbonate crystal principle for soil body surface
The technology of shield.
The technical scheme of prior art one
Grouting Pipe is inserted on ground to be reinforced, using Grouting Pipe by microbial inoculum and consolidating fluid (urea, calcium ion
Mixed solution) ground is simultaneously or successively injected, the calcarinate soil particle formation solidification soil layer produced using microorganism induction.
The shortcoming of prior art one
Microorganism grouting mode consolidated subsoil, the calcium carbonate of generation easily causes jam of grouting pipe, is oozed close to the soil body in pipe week
Permeability is remarkably decreased, and causes follow-up slurries to be difficult to inject, thus the effective radius reinforced is small, and the strength plane distribution of solidification soil layer is equal
Even property is poor, is difficult to use in the anti-erosion top layer protection works of the soil body.
The technical scheme of prior art two
Solid soil body surface sprinkling microbial inoculum and consolidating fluid directly are being treated, the soil body one is infiltrated by the deadweight of sprinkling liquid
Depthkeeping degree, the calcarinate soil particle formation solidified earth surface layer produced using microorganism induction.
The shortcoming of prior art two
Influenceed significantly by factors such as soil body pore size, capillarity, permeability by spray pattern soil mass consolidation effect.
When being reinforced for sand top layer, back-up coat thickness is difficult to control to；When being reinforced for silt top layer, it is difficult to control to except thickness is reinforced
Outside, also there is the problem of back-up coat low intensity, anti-disintegrative are poor.
The technical scheme of prior art three
Mix microbial inoculum and consolidating fluid respectively in compacted soil is treated, uniform mixing forms microorganism mud, injection or
Soil body surface is layed in, soil layer is solidified after being formed after its hardening.
The shortcoming of prior art three
Microbial inoculum and consolidating fluid are mixed and stirred during soil sample, and new adhesive bond generation, original adhesive bond is destroyed,
Bacterium solution and cementing material utilization rate are low, and solidification soil layer final strength increase rate is small, Practical Project poor performance, engineering application value
It is small.
The content of the invention
Technical problem：The purpose of the present invention is to overcome present microorganism surface cure soil body technology to there is solid soil thickness hardly possible
The problem of with control, lack of homogeneity, anti-water erosion with wind erosion ability, bacterium solution and low cementing material utilization rate, invent one
The method for planting the solid soil in microorganism negative pressure surface.
Technical scheme
The present invention principle be：Microbial inoculum and consolidating fluid are sprayed onto soil body surface to be reinforced, vacuum pumping is utilized
Air of the pre-plugged under soil body surface in the negative pressure pipe network of certain depth and soil body pore liquid are taken, makes to form negative in the soil body
Nip, under atmospheric pressure effect, increases and treats the microbial inoculum of solid soil body surface and the infiltration rate of consolidating fluid and depth, and
Using the unsaturation effect of microorganism soil-fixing, during microorganism induction calcium carbonate crystal, make to treat that the solid soil body is in unsaturation
State, calcium carbonate crystal body preferential build is at soil particle contact point, cementing loose sand or silt, improves calcium carbonate crystal
The efficiency of the cementing soil body, obtains the controllable surface protecting layer of uniform, high-strength, thickness, prevents erosion.
The method of the solid soil in a kind of microorganism negative pressure surface, it is characterised in that this method step is as follows：
A. treating that 10~20cm of below the surface of soil mass consolidation 4 buries negative tube 1, line-spacing 20cm forms negative pressure pipe network；
B. microbial inoculum is sprayed onto and treats the surface of soil mass consolidation 4, treated while opening vavuum pump 3 and being extracted by negative tube 1
Air and Pore Solution in soil mass consolidation 4, acceleration treat that the microbial inoculum on the surface of soil mass consolidation 4 is infiltrated, and bacterium solution to be had enters negative
Vavuum pump 3 is closed during pressure pipe 1,4~8h is stood；
C. by the cementing spray solution prepared in advance to the surface of soil mass consolidation 4 is treated, then open vavuum pump 3 and pass through negative tube
1 extracts the air and Pore Solution treated in soil mass consolidation 4, and making treating around negative tube 1, soil mass consolidation 4 is in unsaturated state, when
When saturation degree is reduced to 25%, vavuum pump 3 is closed, 12h is stood；
D. repeat step b, c is until treat that solid soil strength meets reinforcement criteria.
The method of the solid soil in described microorganism negative pressure surface, it is characterised in that described microbial inoculum is by Pasteur's gemma bar
Bacterium constitutes with nutrient solution, bacterial concentration OD600=1.5, consolidating fluid is urea and CaCl2Mixed according to equimolar concentration
Solution, the concentration of urea is 0.5mol/L~1.0mol/L, CaCl2Concentration is 0.5mol/L~1.0mol/L.
The method of the solid soil in described microorganism negative pressure surface, it is characterised in that described negative tube 1 is in the plane according to ten
Word interleaved mode arrangement, longitudinal direction and the mutual not UNICOM of horizontal negative tube, negative tube 1 is internal diameter 1cm plastic tubes, is buried in the earth
The side wall of negative tube 1 opens filter opening.
Beneficial effects of the present invention：
(1) ground top layer is formed negative pressure by vavuum pump pumping, microbial inoculum and cementing solution can be dramatically increased
Infiltration rate and depth, overcome microbial inoculum and cementing solution to be influenceed to be difficult to what is infiltrated by capillarity during sprinkling
Problem, obtains the controllable surface protecting layer of uniform, high-strength, thickness；
(2) using the unsaturation effect of microorganism soil-fixing, by the limited calcium carbonate knot generated during microorganism soil-fixing
Crystal preferential build plays cementation at soil particle contact point, improves the efficiency of the cementing soil body of calcium carbonate crystal, makes simultaneously
Surface cure soil layer keeps good permeability, can ensure certain infiltration rate when surface is by current scour, delay to invade
The stream time is lost；
(3) embedded plastic negative pressure pipe can be used as the flexible reinforcement body in surface cure soil layer, it is to avoid Local Cracking causes
Antiscour failure, improve the overall corrosion resistance of solid soil layer, and with environmental protection and eco-compatibility.
Brief description of the drawings
Fig. 1 negative tubes distribution method and negative pressure device floor map,
Reference：1. negative tube；2. gas-liquid separator；3. vavuum pump；4. treat soil mass consolidation.
Embodiment
Embodiment 1
In this example, a kind of method of the solid soil in microorganism negative pressure surface is used for sand surfacecti proteon, and this method includes following
Step：
A. treating that below the surface of soil mass consolidation 4 20cm buries negative tube 1, line-spacing 20cm forms negative pressure pipe network；
B. the concentration OD that will be made up of Bacillus pasteurii and nutrient solution600=1.5 microbial inoculum, is sprayed onto to be added
Gu the surface of the soil body 4, while open vavuum pump 3 extracts the air and Pore Solution treated in soil mass consolidation 4 by negative tube 1, accelerates to treat
The microbial inoculum on the surface of soil mass consolidation 4 is infiltrated, and is closed vavuum pump 3 when having bacterium solution to enter negative tube 1, is stood 4h；
C. it will prepare in advance by 1.0mol/L urea and 1.0mol/L CaCl2The consolidating fluid mixed, which is sprayed onto, to be treated
The surface of soil mass consolidation 4, then opens vavuum pump 3 and extracts the air and Pore Solution treated in soil mass consolidation 4 by negative tube 1, make to bear
Soil mass consolidation 4 is in unsaturated state to treating around pressure pipe 1, when saturation degree is reduced to 25%, closes vavuum pump 3, stands
12h；
D. repeat step b, c is until treat that solid soil strength meets reinforcement criteria.
Embodiment 2
In this example, a kind of method of the solid soil in microorganism negative pressure surface is used for silt surfacecti proteon, and this method includes following
Step：
A. treating that below the surface of soil mass consolidation 4 10cm buries negative tube 1, line-spacing 20cm forms negative pressure pipe network；
B. the concentration OD that will be made up of Bacillus pasteurii and nutrient solution600=1.5 microbial inoculum, is sprayed onto to be added
Gu the surface of the soil body 4, while open vavuum pump 3 extracts the air and Pore Solution treated in soil mass consolidation 4 by negative tube 1, accelerates to treat
The microbial inoculum on the surface of soil mass consolidation 4 is infiltrated, and is closed vavuum pump 3 when having bacterium solution to enter negative tube 1, is stood 8h；
C. it will prepare in advance by 0.5mol/L urea and 0.5mol/L CaCl2The consolidating fluid mixed, which is sprayed onto, to be treated
The surface of soil mass consolidation 4, then opens vavuum pump 3 and extracts the air and Pore Solution treated in soil mass consolidation 4 by negative tube 1, make to bear
Soil mass consolidation 4 is in unsaturated state to treating around pressure pipe 1, when saturation degree is reduced to 25%, closes vavuum pump 3, stands
12h；
D. repeat step b, c is until treat that solid soil strength meets reinforcement criteria.
Claims (3)
1. the method for the solid soil in a kind of microorganism negative pressure surface, it is characterised in that this method step is as follows：
A. treating that 10~20cm of below soil mass consolidation (4) surface buries negative tube (1), line-spacing 20cm forms negative pressure pipe network；
B. microbial inoculum is sprayed onto and treats soil mass consolidation (4) surface, extracted while opening vavuum pump (3) by negative tube (1)
The air and Pore Solution in soil mass consolidation (4) are treated, acceleration treats that the microbial inoculum on soil mass consolidation (4) surface is infiltrated, bacterium solution to be had
Into vavuum pump (3) is closed when negative tube (1), 4~8h is stood；
C. by the cementing spray solution prepared in advance to soil mass consolidation (4) surface is treated, then open vavuum pump (3) and pass through negative tube
(1) air and Pore Solution treated in soil mass consolidation (4) are extracted, making treating around negative tube (1), soil mass consolidation (4) is in unsaturation
State, when saturation degree is reduced to 25%, closes vavuum pump (3), stands 12h；
D. repeat step b, c is until treat that solid soil strength meets reinforcement criteria.
2. the method for the solid soil in microorganism negative pressure surface according to claim 1, it is characterised in that described microbial inoculum
It is made up of Bacillus pasteurii with nutrient solution, bacterial concentration OD600=1.5, consolidating fluid is urea and CaCl2It is dense according to equimolar
The solution mixed is spent, the concentration of urea is 0.5mol/L~1.0mol/L, CaCl2Concentration is 0.5mol/L~1.0mol/
L。
3. the method for the solid soil in microorganism negative pressure surface according to claim 1, it is characterised in that described negative tube (1) exists
Arranged in plane according to right-angled intersection mode, longitudinal direction is internal diameter 1cm with the mutual not UNICOM of horizontal negative tube (1), negative tube (1)
Plastic tube, the negative tube being buried in the earth (1) side wall opens filter opening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710396335.3A CN107119670A (en) | 2017-05-26 | 2017-05-26 | A kind of solid indigenous method in microorganism negative pressure surface |
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| CN201710396335.3A CN107119670A (en) | 2017-05-26 | 2017-05-26 | A kind of solid indigenous method in microorganism negative pressure surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108049389A (en) * | 2017-11-20 | 2018-05-18 | 河海大学 | A kind of windproof microporous pipeline spray system and its application method fixed the sand for microorganism |
| CN108761044A (en) * | 2018-08-13 | 2018-11-06 | 重庆科技学院 | The experimental rig and method of microorganism induction precipitation of calcium carbonate solidification sand under a kind of subnormal ambient |
| CN108797562A (en) * | 2018-06-15 | 2018-11-13 | 南京理工大学 | A kind of liquefied foundation microorganism grouting method |
| CN108911605A (en) * | 2018-08-13 | 2018-11-30 | 重庆科技学院 | A kind of method that microorganism induction precipitation of calcium carbonate produces prefabricated drainage pipeline under subnormal ambient |
| 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 |
| CN109826211A (en) * | 2019-02-18 | 2019-05-31 | 西安工程大学 | A kind of sand slope protection construction method |
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| JP2011157700A (en) * | 2010-01-29 | 2011-08-18 | Ehime Univ | Soil improving method |
| CN104631430A (en) * | 2014-12-29 | 2015-05-20 | 南京林业大学 | Method for soft soil foundation treatment through microorganism grouting sand drain |
| CN105350517A (en) * | 2015-10-26 | 2016-02-24 | 南京林业大学 | Method for consolidating subsoil through microorganisms in circulating grouting mode |
| CN105507232A (en) * | 2015-12-08 | 2016-04-20 | 南京林业大学 | Microorganism slab grouting device and method used for reinforcing liquefiable foundation |
| CN105714765A (en) * | 2016-02-01 | 2016-06-29 | 南京林业大学 | Microorganism low-temperature grouting and soil reinforcing method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011157700A (en) * | 2010-01-29 | 2011-08-18 | Ehime Univ | Soil improving method |
| CN104631430A (en) * | 2014-12-29 | 2015-05-20 | 南京林业大学 | Method for soft soil foundation treatment through microorganism grouting sand drain |
| CN105350517A (en) * | 2015-10-26 | 2016-02-24 | 南京林业大学 | Method for consolidating subsoil through microorganisms in circulating grouting mode |
| CN105507232A (en) * | 2015-12-08 | 2016-04-20 | 南京林业大学 | Microorganism slab grouting device and method used for reinforcing liquefiable foundation |
| CN105714765A (en) * | 2016-02-01 | 2016-06-29 | 南京林业大学 | Microorganism low-temperature grouting and soil reinforcing method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108049389A (en) * | 2017-11-20 | 2018-05-18 | 河海大学 | A kind of windproof microporous pipeline spray system and its application method fixed the sand for microorganism |
| CN108797562A (en) * | 2018-06-15 | 2018-11-13 | 南京理工大学 | A kind of liquefied foundation microorganism grouting method |
| CN108761044A (en) * | 2018-08-13 | 2018-11-06 | 重庆科技学院 | The experimental rig and method of microorganism induction precipitation of calcium carbonate solidification sand under a kind of subnormal ambient |
| CN108911605A (en) * | 2018-08-13 | 2018-11-30 | 重庆科技学院 | A kind of method that microorganism induction precipitation of calcium carbonate produces prefabricated drainage pipeline under subnormal ambient |
| CN108911605B (en) * | 2018-08-13 | 2020-07-17 | 重庆科技学院 | Method for producing prefabricated drainage pipeline by microorganism-induced calcium carbonate precipitation in negative pressure environment |
| 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 |
| CN109826211A (en) * | 2019-02-18 | 2019-05-31 | 西安工程大学 | A kind of sand slope protection construction method |
| CN109826211B (en) * | 2019-02-18 | 2021-01-29 | 西安工程大学 | Sand slope protection construction method |
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