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Method for eliminating loess collapsibility through microbial grouting

A microbial and collapsible technology, applied in the field of microbial grouting to eliminate loess collapsibility, can solve problems such as insufficient applicability, high implementation cost, and cumbersome implementation, and achieve obvious effects and reduce collapsibility

Inactive Publication Date: 2021-11-02
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In building construction, there are many ways to eliminate the collapsibility of loess. Commonly used treatment measures include: replacement and filling method, dynamic compaction method, compaction method, chemical method, pre-soaking meth

Method used

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  • Method for eliminating loess collapsibility through microbial grouting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 (Xianyang site soil):

[0020] A method for eliminating the collapsibility of loess by microbial grouting, specifically comprising the following steps:

[0021] 1) Slowly and evenly add the Bacillus busi solution to the loess at a rate of 5ml / s, let it infiltrate naturally, until the Bacillus busi solution completely infiltrates the soil, and let it stand for 25 minutes;

[0022] 2) Slowly and evenly add 1 mol / L cementing fluid equivalent to the Bacillus busi solution at a rate of 5ml / s to the loess after adding the Bacillus busi solution in step 1, and let it stand for 24 hours at an ambient temperature of 25°C;

[0023] 3) Repeat steps 1)-2) 4 times.

[0024] After testing, the collapsibility coefficient of the site soil dropped from 0.022 to 0.007.

Embodiment 2

[0025] Embodiment 2 (Xianyang site soil):

[0026] A method for eliminating the collapsibility of loess by microbial grouting, specifically comprising the following steps:

[0027] 1) Slowly and evenly add the Bacillus busi solution to the loess at a rate of 8ml / s, let it infiltrate naturally, until the Bacillus busi solution completely infiltrates the soil, and let it stand for 30 minutes;

[0028] 2) Slowly and evenly add 1.5 mol / L cementing fluid equivalent to the Bacillus busi solution at a speed of 8ml / s to the loess after adding the Bacillus busi solution in step 1, and let it stand for 36 hours at an ambient temperature of 27°C;

[0029] 3) Repeat steps 1)-2) 5 times.

[0030] After testing, the collapsibility coefficient of the site soil dropped from 0.022 to 0.005.

Embodiment 3

[0031] Embodiment 3 (Xianyang site soil):

[0032] A method for eliminating the collapsibility of loess by microbial grouting, specifically comprising the following steps:

[0033] 1) Slowly and evenly add the Bacillus busi solution to the loess at a rate of 10ml / s, let it infiltrate naturally, until the Bacillus busi solution completely infiltrates the soil, and let it stand for 35 minutes;

[0034] 2) Slowly and evenly add 2 mol / L cementing fluid equivalent to the Bacillus busi solution at a rate of 10ml / s to the loess after adding the Bacillus busi solution in step 1, and let it stand for 48 hours at an ambient temperature of 30°C;

[0035] 3) Repeat steps 1)-2) 6 times.

[0036] After testing, the collapsibility coefficient of the site soil dropped from 0.022 to 0.006.

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Abstract

The invention discloses a method for eliminating loess collapsibility through microbial grouting. The method comprises the steps that bacillus pasteurii liquid is slowly and evenly added into loess, natural infiltration is conducted till the bacillus pasteurii liquid completely infiltrates a soil body, standing is conducted for 25-35 min, then 1-2 mol/L cementing liquid with the same amount as the bacillus pasteurii liquid is slowly and evenly added, standing is conducted for 24-48 h at the environment temperature of 25-30 DEG C, and circulation is conducted for no less than 4 times. Calcium carbonate precipitates are induced to be generated through the bacterial liquid in a urea hydrolysis technology mode, and loess collapsibility is eliminated; and according to the method, the loess site soil samples of different collapsibility grades are reinforced by utilizing the MICP reinforcing technology, so that the purpose of eliminating the loess collapsibility is achieved, the method has the advantages that the method is simple, the raw materials are easy to obtain, the cost is low, the effect of eliminating the loess collapsibility is obvious, and the method has important practical engineering significance.

Description

technical field [0001] The invention belongs to the technical field of environmental geotechnical engineering, in particular to a method for eliminating the collapsibility of loess by microbial grouting. Background technique [0002] Collapsible loess has high strength and low compressibility in the state of natural low moisture content, but when the soil is soaked by water, the structure of the soil is destroyed, the strength decreases rapidly, and the compression If the property becomes larger, it will produce greater additional settlement under the same foundation load, which will cause great harm to building safety. In building construction, there are many ways to eliminate the collapsibility of loess. Commonly used treatment measures include: replacement and filling method, dynamic compaction method, compaction method, chemical method, pre-soaking method and cast-in-place pile foundation method, etc., due to different projects The particularity and complexity of the im...

Claims

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Application Information

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IPC IPC(8): E02D3/12C12N1/20C12R1/07
CPCE02D3/12C12N1/20
Inventor 刘小军李涛白斯达潘超钒方玉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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