CN108797562A - A kind of liquefied foundation microorganism grouting method - Google Patents
A kind of liquefied foundation microorganism grouting method Download PDFInfo
- Publication number
- CN108797562A CN108797562A CN201810616791.9A CN201810616791A CN108797562A CN 108797562 A CN108797562 A CN 108797562A CN 201810616791 A CN201810616791 A CN 201810616791A CN 108797562 A CN108797562 A CN 108797562A
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- China
- Prior art keywords
- fixer
- cacl
- solution
- slip casting
- grouting method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
Abstract
The invention discloses a kind of liquefied foundation microorganism grouting methods.The method is with microbial inoculum and CaCl2The mixed solution of solution is fixer, controls CaCl in fixer2A concentration of 30~50mM/L, first fixer is poured into sand column, stationary culture in situ, then pour into nutrient salt solution, the nutrient salt solution be 0.5mol/L isoconcentrations urea and CaCl2Mixed liquor determines slip casting batch according to solidifying requirements.The method of the present invention can effectively shorten hardening time, reduce bacterium solution dosage and slip casting batch, and calcium carbonate gelling is effectively relieved and is unevenly distributed phenomenon.
Description
Technical field
The present invention relates to a kind of liquefied foundation microorganism grouting methods, belong to injecting paste material preparing technical field.
Background technology
The ground of soft foundation, the especially soil layer containing liquefiable, under increasingly increased traffic loading reciprocating or ground
It shakes under load action, fatigue life and working performance allow of no optimist.The method of traditional liquefied foundation regulation mainly passes through
Inhibit excess pore water pressure accumulation or improve soil strength, to slow down liquefied foundation caused by destroy.
Ideal injecting paste material needs controllable gelling time and lower viscosity to ensure that it can be transferred to finger
Fixed position.Traditional liquefied foundation regulation method mainly passes through the accumulation for inhibiting excess pore water pressure or the raising soil body
Intensity.Currently used grouting method mainly has cement injection and chemical grouting.Cement injection since cement granules grain size is big, because
This slurry transmission range in the soil body is small, and grouting pressure is big.Chemical grouting causes environment since slurry has certain toxicity
Pollution, and it is cementing after intensity it is low (Towhata I.Geotechnical Earthquake Engineering.Springer,
2008.)。
Specific microorganism, for example, urease-producing microorganism when using nutritive salt rich in calcium ion and nitrogen source, can
The calcium carbonate crystal with gelatification is quickly precipitated.Microorganism induction calcium carbonate crystal slurry injection technique can effectively improve weak sand
The strength and stability of soil is cut under the intensity of intensity and rigidity effectively improving the soil body, moreover it is possible to keep the permeability that the soil body is certain
(Nemati M,Voordouw G.Modification of porous media permeability,using calcium
carbonate produced enzymatically in situ.Enzyme and Microbial Technology,
2003,33(5):635-642.)。
Relative to traditional cement or chemical grouting technology, microorganism slurry injection technique has a some superiority, but its exist with
Lower urgent problem to be solved：(1) can grouting mode and batch be further simplified, in order to practical operation；(2) microorganism and battalion
Can salt dosage be supported reduce, to reduce cost；(3) can the calcium carbonate gelling that reaction generates be uniformly distributed, to give full play to glue
Solidifying intensity；(4) how to determine suitable solidification intensity, put in raising soil body liquefaction stress and reduction acceleration surface with realizing
Big coefficient obtains therebetween balance (Dejong JT, et al.Microbially induced cementation to
control sand response to undrained shear.Journal of Geotechnical and
Geoenvironmental Engineering.2006,132(11):1381-1392.)。
Invention content
The purpose of the present invention is to provide a kind of liquefied foundation microorganism grouting methods.The method is by controlling fixer
Concentration reduces bacterium solution dosage and slip casting batch, shortens hardening time, solves the problems, such as that calcium carbonate gel is unevenly distributed, simultaneously
Give full play to calcium carbonate biology cementitious material solidification intensity.
Realize that the technical solution of the object of the invention is as follows：
A kind of liquefied foundation microorganism grouting method, is as follows：
With microbial inoculum and CaCl2The mixed solution of solution is fixer, controls CaCl in fixer2A concentration of 30
~50mM/L first pours into fixer in sand column, stationary culture in situ, then pours into nutrient salt solution, the nutrient salt solution
For the urea and CaCl of 0.5mol/L isoconcentrations2Mixed liquor determines slip casting batch according to solidifying requirements.
Preferably, the bacterium solution injection speed is 1~2ml/min.
Preferably, the nutritive salt slip casting rate is 0.3ml/min~1ml/min.
Preferably, the stationary culture time in situ be 12~for 24 hours.
Compared with prior art, the present invention has the following advantages：
The present invention is by controlling CaCl in fixer2Concentration, save raw material usage and shorten the curing reaction time, it is full
Solidifying requirements in sufficient practical application.
Description of the drawings
Fig. 1 is lower transmission rate figure of the bacterium solution in sand column of various concentration fixer effect.
Specific implementation mode
With reference to embodiment, the invention will be further described.
Embodiment 1
It is to wait for cementing sample with 30% sand column of relative compaction, slip casting bacterial concentration in inlet is compared with exit bacterial concentration
For main criterion.With microbial inoculum and CaCl2The mixed solution of solution is fixer, CaCl in fixer2Concentration point
Not Wei 25,30,50mM/L, first fixer is poured into sand column by the injection speed of 1ml/min, stationary culture 12h in situ, then with
The injection speed of 0.29ml/min pours into the urea and CaCl of 0.5mol/L isoconcentrations2The nutrient salt solution of mixed liquor composition.
CaCl in fixer2When solution concentration is respectively 25mM/L, 30mM/L and 50mM/L, fixed rate is respectively 40%,
75% and 95%.As shown in FIG. 1, FIG. 1 is various concentration fixers to act on lower transmission rate figure of the bacterium solution in sand column, C/C0
For grout outlet bacterium solution OD600With slip casting bacterium solution OD600Ratio；t/t0When being equal to sand column porosity for slip casting time and grouting volume
Slip casting time ratios.When concentration is more than 50mM/L, bacterium solution is transmitted uneven and transmission speed and is severely impacted, calcium carbonate distribution
It is uneven.
Claims (4)
1. a kind of liquefied foundation microorganism grouting method, which is characterized in that be as follows：
With microbial inoculum and CaCl2The mixed solution of solution is fixer, controls CaCl in fixer2A concentration of 30~
50mM/L first pours into fixer in sand column, stationary culture in situ, then pours into nutrient salt solution, and the nutrient salt solution is
The urea and CaCl of 0.5mol/L isoconcentrations2Mixed liquor determines slip casting batch according to solidifying requirements.
2. microorganism grouting method according to claim 1, which is characterized in that the bacterium solution injection speed be 1~
2ml/min。
3. microorganism grouting method according to claim 1, which is characterized in that the nutritive salt slip casting rate is
0.3ml/min~1ml/min.
4. microorganism grouting method according to claim 1, which is characterized in that the stationary culture time in situ is 12
~for 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810616791.9A CN108797562A (en) | 2018-06-15 | 2018-06-15 | A kind of liquefied foundation microorganism grouting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810616791.9A CN108797562A (en) | 2018-06-15 | 2018-06-15 | A kind of liquefied foundation microorganism grouting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108797562A true CN108797562A (en) | 2018-11-13 |
Family
ID=64086866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810616791.9A Pending CN108797562A (en) | 2018-06-15 | 2018-06-15 | A kind of liquefied foundation microorganism grouting method |
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Citations (9)
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|---|---|---|---|---|
| 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 |
| CN104818719A (en) * | 2015-03-16 | 2015-08-05 | 山东建筑大学 | Microorganism grouting method capable of improving early-stage calcium carbonate deposit volume |
| CN105220681A (en) * | 2015-10-26 | 2016-01-06 | 南京林业大学 | A kind of method of microorganism-electric field joint reinforcement Liquefaction Foundation |
| 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 |
| CN205224011U (en) * | 2015-12-08 | 2016-05-11 | 南京林业大学 | A dull and stereotyped slip casting device of microorganism for reinforcing ground that can liquefy |
| CN105714765A (en) * | 2016-02-01 | 2016-06-29 | 南京林业大学 | Microorganism low-temperature grouting and soil reinforcing method |
| CN106222102A (en) * | 2016-07-15 | 2016-12-14 | 南京林业大学 | A kind of multi-cultur es associating microorganism soil-fixing method |
| CN107119670A (en) * | 2017-05-26 | 2017-09-01 | 南京林业大学 | A kind of solid indigenous method in microorganism negative pressure surface |
| 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 |
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2018
- 2018-06-15 CN CN201810616791.9A patent/CN108797562A/en active Pending
Patent Citations (9)
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|---|---|---|---|---|
| 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 |
| CN104818719A (en) * | 2015-03-16 | 2015-08-05 | 山东建筑大学 | Microorganism grouting method capable of improving early-stage calcium carbonate deposit volume |
| CN105220681A (en) * | 2015-10-26 | 2016-01-06 | 南京林业大学 | A kind of method of microorganism-electric field joint reinforcement Liquefaction Foundation |
| 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 |
| CN205224011U (en) * | 2015-12-08 | 2016-05-11 | 南京林业大学 | A dull and stereotyped slip casting device of microorganism for reinforcing ground that can liquefy |
| CN105714765A (en) * | 2016-02-01 | 2016-06-29 | 南京林业大学 | Microorganism low-temperature grouting and soil reinforcing method |
| CN106222102A (en) * | 2016-07-15 | 2016-12-14 | 南京林业大学 | A kind of multi-cultur es associating microorganism soil-fixing method |
| CN107119670A (en) * | 2017-05-26 | 2017-09-01 | 南京林业大学 | A kind of solid indigenous method in microorganism negative pressure surface |
| 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 |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181113 |