CN107100162B - Indigenous method is consolidated in a kind of microorganism gas-liquid cycle slip casting - Google Patents
Indigenous method is consolidated in a kind of microorganism gas-liquid cycle slip casting Download PDFInfo
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- CN107100162B CN107100162B CN201710371199.2A CN201710371199A CN107100162B CN 107100162 B CN107100162 B CN 107100162B CN 201710371199 A CN201710371199 A CN 201710371199A CN 107100162 B CN107100162 B CN 107100162B
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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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- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Indigenous method is consolidated in a kind of microorganism gas-liquid cycle slip casting, and step includes: a. that grouting tube 1 is vertically squeezed into ground 7；B. it is injected in the solid soil body 8 by grouting tube 1 to solid 1.5 times of 8 pore volume of the soil body of OD600=1.2 bacterium solution 3 reinjects the urea and CaCl that are 0.5mol/L~1.0mol/L with the isometric concentration of bacterium solution 32The consolidating fluid 4 mixed；C. using air compressor 6, injection pressure is 100KPa~200KPa in the solid soil body 8, volume is the compressed air to 1.5 times of solid soil body pore volume, will eject to the Pore Solution in the solid soil body 8, make to be in unsaturated state to the solid soil body 8, and stand 12h；D. to inject 1.5 times of consolidating fluids 4 to solid 8 pore volume of the soil body in the solid soil body 8,12h is stood；E. d is repeated to operate 1 time；F. b, c, d, e operation is repeated, until reaching requirement or slip casting liquid (bacterium solution 3 or consolidating fluid 4) when solid soil body Final 8 degree can not inject when in the solid soil body 8, stops slip casting.
Description
Technical field
Consolidate land reform the present invention relates to microorganism gas-liquid cycle slip casting and is apt to soil strength uniformity and improvement grouting process enhancing
The method of soil strength belongs to the technical field of soil stabilization.
Background technique
Microorganism soil-fixing technology is the solid indigenous method of a kind of ecology, environmental protection, and the solid soil of existing microorganism slip casting mainly passes through
Alternately injection microbial inoculum and consolidating fluid, using microorganism induction calcium carbonate crystal technology (MICP technology), finally in soil
The cementing soil particle of calcium carbonate crystal is precipitated in intergranular pore.The CaCO of microorganism induction deposition3Crystalline solid has cementing and filling
Effect, the soil body can be reinforced effectively.Microorganism slip casting solidification sand and silt are mainly utilized in engineering at present.
The technical solution of the prior art one
It is that low speed injects a certain amount of microbial inoculum into soil first, then low speed injects the CaCl of low concentration2It is fixed
Liquid utilizes Ca2+Flocculation, realize the fixation of microorganism, last low speed injects consolidating fluid (i.e. urea and CaCl2Mixing
Liquid) so that the continuous mineralising of the microorganism for being adsorbed on sand particle surface generates calcite crystalline solid, solidify the soil body.
The shortcomings that prior art one
It is reacted for control and CaCO is precipitated3The rate of crystalline solid, it is micro- using alternately injecting that microorganism slip casting solidifies sand
Biological bacterium solution and consolidating fluid, grouting method length amplitude of variation along grouting serous fluid flow direction is big, and there are significant unevenness
Even property, the neighbouring CaCO of grouting port3Crystalline solid blocks soil body hole and forms blocking, causes distal end to reinforce difficult, single hole slip casting is effective
Reinforcing scope is small, and this method period is long, and low efficiency, stock utilization is low, deficiency in economic performance.
The technical solution of the prior art two
Microbial inoculum stirring is buried, a period of time is stood after sample is made, adsorbs bacterium sufficiently, then repeatedly injection
Consolidating fluid solidifies the soil body so that calcite crystalline solid is precipitated in the continuous mineralising of the microorganism being adsorbed on soil particle.
The shortcomings that prior art two
Because being buried using microbial inoculum stirring, so the grouting method can only once introduce microorganism to the soil body is reinforced
Bacterium, as multiple consolidating fluid injects, micro organism quantity consumption decaying in the soil body, and the efficiency of the calcium carbonate of its mineralising generation is very
It is fast to reduce, it is difficult to form high-intensitive soil mass consolidation.
The technical solution of the prior art three
Mix microbial inoculum and consolidating fluid respectively in soil, sample is made in uniform mixing, and stand makes the soil body for a period of time
Form intensity.
The shortcomings that prior art three
During microbial inoculum and consolidating fluid mix and stir soil sample, new adhesive bond is generated, and original adhesive bond is destroyed,
Soil body final strength increase rate is small, and Practical Project performance is poor, and engineering application value is small.
The technical solution of the prior art four
Manufactured soil sample is directly immersed in binding liquid to (binding liquid is in addition to mainly containing urea and CaCl2In addition, also contain
There is NH4Cl、NaHCO3And nutriment), a period of time is stood, through binding liquid free permeation into soil body hole, with micro-
PH value in bio-metabolic process increases, the cementing soil body of microorganism induction calcium carbonate crystal.
The shortcomings that prior art four
Microorganism adsorption by mineralization, adjusts pH, makes the carbonate knot generated on soil particle in the testing program
Partial crystallization goes out, and reaction is slow, Gu the native period is long.
Summary of the invention
Technical problem: existing microorganism slip casting soil retaining technology, the slip casting period is longer, low efficiency, and stock utilization is low；Slip casting
Soil body permeability is poor near mouthful, easily blocks, and distal end is caused to reinforce difficulty, it is difficult to form high-intensitive uniform consolidation body, single hole is infused
It is small to starch effective reinforced area.The purpose of the present invention is the gas using alternately injection microbial inoculum, compressed air and consolidating fluid
Liquid recycles slip casting soil retaining technology, reduces the saturation degree to the solid soil body by injecting compressed air, realizes in low CaCO3Crystallization content
Under the conditions of formed high-intensitive, save material utilization amount, while solving the problems, such as that grouting port distal end reinforces, expand single hole slip casting and effectively add
Gu range.
Technical solution
The principle of the present invention are as follows: overcome using the unsaturation effect of the solid soil of microorganism slip casting and lacked existing for existing saturation slip casting
It falls into.During microorganism slip casting under soil body saturation state is solid native, CaCO3Soil is mainly filled in its effect when crystallization content is lower
Based on body opening gap, it is cementing supplemented by, soil strength improve it is limited；In CaCO3Its effect is mainly filled under crystallization content moderate condition
Soil body hole is to play a role jointly with cementing soil particle；In CaCO3Under crystallization content higher strip part, CaCO is increased newly3Crystallization is to the soil body
The raising contribution efficiency of intensity significantly improves, but soil body hole can not continue slip casting close to closing at this time.In soil body unsaturation shape
During the solid soil of microorganism slip casting under state, the CaCO of microorganism induction precipitation3Easily calcite is formed on soil body particle surface
Coating, and calcium carbonate crystal body is preferentially precipitated at soil particle contact point, bridge joint is formed between soil particle, is analysed under unsaturated state
CaCO out3Crystalline solid is mainly used for cementing soil particle, only minimal amount of CaCO3Crystalline solid fills soil body hole, makes to be added
Gu the soil body is in low CaCO3High intensity can be formed under the conditions of crystallization content, in high CaCO3Crystallization content condition still keeps high osmosis,
The soil body property infused is kept, prevents grouting port from nearby blocking, guarantees that the grouting port distal end soil body is reinforced, it is effective to expand single hole slip casting
Reinforcing scope.
Indigenous method is consolidated in a kind of microorganism gas-liquid cycle slip casting, it is characterised in that the method steps are as follows:
A. grouting tube 1 is vertically squeezed into ground 7；
B. by grouting tube 1, the concentration injected in the solid soil body 8 first to 1.5 times of solid soil body pore volume is
OD600=1.2 bacterium solution 3 reinjects the urea and CaCl that are 0.5mol/L~1.0mol/L with the isometric concentration of bacterium solution 32It is mixed
Consolidating fluid 4 made of conjunction；
C. using air compressor 6, injection pressure is 100KPa~200KPa in the solid soil body 8, volume is to the solid soil body
The compressed air of 8 1.5 times of pore volumes will eject to the Pore Solution in the solid soil body 8, make to be in unsaturation shape to the solid soil body 8
State, saturation degree need to be controlled 20%~40%, stand 12h；
D. it is injected in the solid soil body 8 to solid 1.5 times of 8 pore volume of the soil body of consolidating fluid 4, stands 12h；
E. d is repeated to operate 1 time；
F. b, c, d, e operation is repeated, (bacterium solution 3 is cementing until reaching requirement or slip casting liquid to solid soil body Final 8 degree
Liquid 4) it can not inject when in the solid soil body 8, stop slip casting.
The method of the solid soil of the microorganism gas-liquid cycle slip casting, it is characterised in that bacterium solution used is Bacillus pasteurii
(S. pasteurii)。
Beneficial effects of the present invention:
(1) the gas-liquid cycle grouting and reinforcing soil body effectively improves the uniformity of soil stabilization, prevents grouting port from nearby blocking,
Guarantee that the grouting port distal end soil body is reinforced, expands single hole slip casting effective reinforced area.
(2) can guarantee to keep original permeability not drop significantly to the solid soil body during the slip casting of microorganism gas-liquid cycle
It is low, it can be achieved that more wheel slip castings to fine grained soil, make microorganism slip casting solidification fine grained soil that can also reach very high-intensitive, extend microorganism
Gu the applicable soil property range of soil.
(3) identical CaCO is being generated3It can get higher soil strength under content, reduce injecting paste material consumption, improve
Stock utilization.
Detailed description of the invention
Fig. 1 slip casting schematic diagram
Appended drawing reference: 1- grouting tube, 2- grouting pump, 3- bacterium solution, 4- consolidating fluid, 5- valve, 6- air compressor, 7-
Base, the 8- soil body to be consolidated
Specific embodiment
Embodiment 1
In this example, a kind of microorganism gas-liquid cycle slip casting consolidates indigenous method for solidifying sand foundation, this method include with
Lower step:
A. grouting tube 1 is vertically squeezed into ground 7；
B. by grouting tube 1, the concentration injected in the solid soil body 8 first to 1.5 times of solid soil body pore volume is
OD600=1.2 Bacillus pasteurii bacterium solution 3, reinject with the isometric concentration of bacterium solution 3 be 1.0mol/L urea with
The CaCl of 1.0mol/L2The consolidating fluid 4 mixed；
C. using air compressor 6, injection pressure is 100KPa in the solid soil body 8, volume is to solid soil body pore volume
1.5 times of compressed air will eject to the Pore Solution in the solid soil body 8, make to be in unsaturated state to the solid soil body 8, stand 12h；
D. the consolidating fluid 4 to 1.5 times of solid soil body pore volume is injected in the solid soil body 8, stands 12h；
E. d is repeated to operate 1 time；
F. b, c, d, e operation is repeated, (bacterium solution 3 is cementing until reaching requirement or slip casting liquid to solid soil body Final 8 degree
Liquid 4) it can not inject when in the solid soil body 8, stop slip casting.
Embodiment 2
In this example, a kind of microorganism gas-liquid cycle slip casting consolidates indigenous method for solidifying silt foundation, this method include with
Lower step:
A. grouting tube 1 is vertically squeezed into ground 7；
B. by grouting tube 1, the concentration injected in the solid soil body 8 first to 1.5 times of solid soil body pore volume is
OD600=1.2 Bacillus pasteurii bacterium solution 3, reinject with the isometric concentration of bacterium solution 3 be 0.5mol/L urea with
The CaCl of 0.5mol/L2The consolidating fluid 4 mixed；
C. using air compressor 6, injection pressure is 200KPa in the solid soil body 8, volume is to solid 8 pore-body of the soil body
The compressed air of 1.5 times of product will eject to the Pore Solution in the solid soil body 8, make to be in unsaturated state to the solid soil body 8, stand
12h；
D. it is injected in the solid soil body 8 to solid 1.5 times of 8 pore volume of the soil body of consolidating fluid 4, stands 12h；
E. d is repeated to operate 1 time；
F. b, c, d, e operation is repeated, (bacterium solution 3 is cementing until reaching requirement or slip casting liquid to solid soil body Final 8 degree
Liquid 4) it can not inject when in the solid soil body 8, stop slip casting.
Claims (2)
1. indigenous method is consolidated in a kind of microorganism gas-liquid cycle slip casting, it is characterised in that the method steps are as follows:
A. grouting tube (1) is vertically squeezed into ground (7)；
B. injecting in the solid soil body (8) to the concentration of 1.5 times of pore volume of the solid soil body (8) is OD600=1.2 bacterium solution (3),
Reinject the urea and CaCl that are 0.5mol/L~1.0mol/L with bacterium solution (3) isometric concentration2The consolidating fluid mixed
(4)；
It c. is 100KPa~200KPa using air compressor (6) injection pressure in the solid soil body (8), volume is to the solid soil body
(8) 1.5 times of pore volume of compressed air will be ejected to the Pore Solution in the solid soil body (8), make to be in non-full to the solid soil body (8)
And state, saturation degree need to be controlled 20%~40%, stand 12h；
D. the consolidating fluid (4) to 1.5 times of pore volume of the solid soil body (8) is injected in the solid soil body (8), stands 12h；
E. d is repeated to operate 1 time；
F. b, c, d, e operation is repeated, until reaching requirement or slip casting liquid (bacterium solution (3) or cementing to the solid soil body (8) intensity
Liquid (4)) it can not inject when in the solid soil body (8), stop slip casting.
2. the method for the solid soil of microorganism gas-liquid cycle slip casting according to claim 1, it is characterised in that bacterium solution used is bar
Family name bacillus (S.pasteurii).
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| CN107100162B true CN107100162B (en) | 2019-02-22 |
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Families Citing this family (12)
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|---|---|---|---|---|
| CN108049409A (en) * | 2017-11-14 | 2018-05-18 | 河海大学 | A kind of method of the solid soil of microbes synthase inhibitor slip casing by pressure |
| CN108192623A (en) * | 2018-01-10 | 2018-06-22 | 南京林业大学 | Bayer process red mud roadbed microorganism curing and application process |
| CN108220197A (en) * | 2018-01-10 | 2018-06-29 | 南京林业大学 | A kind of gold tailings slag microorganism combined processing and application process |
| CN109165479B (en) * | 2018-10-29 | 2020-08-04 | 西南大学 | Method for judging soil body applicable to MICP technology |
| CN110130318A (en) * | 2019-05-24 | 2019-08-16 | 南京林业大学 | A kind of construction method of microorganism mixing-filling stake |
| CN110284491B (en) * | 2019-07-31 | 2024-07-23 | 南京林业大学 | Magnetized solution microorganism soil solidifying device and method |
| CN110886282B (en) * | 2019-12-17 | 2020-07-03 | 西南石油大学 | Particle excitation type microorganism soil stabilization wall protection device |
| CN112030942A (en) * | 2020-08-31 | 2020-12-04 | 南京林业大学 | Method for improving liquefaction resistance of foundation by silicate mineral decomposing bacteria |
| CN114396038A (en) * | 2022-01-21 | 2022-04-26 | 中煤航测遥感集团有限公司 | Method for reinforcing soil strength by using microorganism induced calcium carbonate deposition |
| CN115247420A (en) * | 2022-09-02 | 2022-10-28 | 浙江大学 | Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof |
| CN116397618B (en) * | 2023-02-21 | 2024-04-19 | 广州航海学院 | Method for reinforcing foundation of silt by combining hydraulic fracturing and MICP technology |
| CN116335115A (en) * | 2023-02-21 | 2023-06-27 | 广州航海学院 | Liquefied sand foundation treatment method combining high-energy gas fracturing and MICP technology |
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| AU2010281688B2 (en) * | 2009-08-03 | 2014-04-10 | University Of Idaho | In situ precipitation of calcium carbonate (CaCO3) by indigenous microorganisms to improve mechanical properties of a geomaterial |
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Application publication date: 20170829 Assignee: Nanjing Ruichi Engineering Technology Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2021320000047 Denomination of invention: A method of soil consolidation by microbial gas liquid circulation grouting Granted publication date: 20190222 License type: Common License Record date: 20210706 |
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Application publication date: 20170829 Assignee: Nanjing Ruichi Engineering Technology Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2022320000133 Denomination of invention: A soil consolidation method of microbial gas-liquid circulation grouting Granted publication date: 20190222 License type: Common License Record date: 20220721 |