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A kind of microbiological low-temperature grouting soil consolidation method

A technology of microorganisms and microbial glue, which is applied in chemical instruments and methods, soil protection, building construction, etc., can solve the problems of uneven grouting of microorganisms at room temperature, etc., to improve the effect of soil consolidation, enhance the strength of soil, and save treatment The effect of fees

Active Publication Date: 2017-08-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to provide a method for microbial low-temperature grouting soil consolidation, by changing the temperature of the grouting solution, and changing the alternate injection of bacteria liquid and mixed liquid into mixed single liquid single grouting, shortening the grouting cycle and improving resource utilization efficiency, and effectively solved the problem of inhomogeneity of microbial normal temperature grouting, thus forming a new microbial grouting soil consolidation program

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  • A kind of microbiological low-temperature grouting soil consolidation method

Examples

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Effect test

Embodiment 1

[0041] In this example, a microbial low-temperature grouting soil consolidation method is used to consolidate sandy soil foundations, and the method includes the following steps:

[0042] a. According to the actual engineering foundation soil conditions, choose summer for construction, and drive the grouting flower tube 2 of the low-temperature grouting equipment into the sandy soil foundation 3 according to the design requirements;

[0043] b. Use centrifugation to remove the existing biological enzymes and mix the 4°C low-temperature bacterial liquid with the mixture of 4°C calcium chloride and urea to make a microbial cementing liquid, and keep the temperature at 4°C, in which the concentration of the bacterial liquid is OD 600 =1.2, calcium chloride concentration is 0.50mol / L, urea concentration is 0.50mol / L;

[0044] c. Load the insulated container 1 with a well-proportioned 4°C low-temperature microbial cementing liquid 4, and the temperature control system 7 controls th...

Embodiment 2

[0049] In this example, a microbial low-temperature grouting soil consolidation method is used to solidify the silt foundation (the natural void ratio of the silt in the site is 0.87), and the method includes the following steps:

[0050] a. According to the actual project foundation soil conditions, choose summer for construction, and drive the grouting flower tube of the low-temperature grouting equipment into the powder soil foundation according to the design requirements;

[0051] b. Use centrifugation to remove the existing biological enzymes and prepare 4°C low-temperature bacterial liquid (bacterial liquid concentration OD 600 =1.2), mixed with a mixed solution of 4°C calcium chloride and urea (the concentration of calcium chloride is 0.25mol / L, and the concentration of urea is 0.25mol / L) to make a microbial cementing liquid, and keep the temperature at 4°C;

[0052] c. Load the insulated container 1 with a well-proportioned 4°C low-temperature microbial cementing liquid ...

Embodiment 3

[0057] In this example, a microbial low-temperature grouting soil consolidation method is used to solidify the silt foundation (the natural void ratio of the silt in the site is 0.42), and the method includes the following steps:

[0058] a. According to the actual project foundation soil conditions, choose summer for construction, and drive the grouting flower tube of the low-temperature grouting equipment into the powder soil foundation according to the design requirements;

[0059] b. Use centrifugation to remove the existing biological enzymes and prepare 4°C low-temperature bacterial liquid (bacterial liquid concentration OD 600 =1.2), mixed with a mixed solution of 4°C calcium chloride and urea (the concentration of calcium chloride is 0.10mol / L, and the concentration of urea is 0.10mol / L) to make a microbial cementing liquid, and keep the temperature at 4°C;

[0060] c. Load the insulated container 1 with a well-proportioned 4°C low-temperature microbial cementing liqui...

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Abstract

A method for microbial low-temperature grouting, the steps comprising: a. driving the grouting flower tube 2 of the low-temperature grouting equipment into the foundation 3; b. using centrifugation to remove the existing biological enzymes and preparing a 4°C low-temperature bacterial solution (Bacterial solution concentration OD600=1.2 or so), mixed with calcium chloride and urea at 4°C (calcium chloride concentration is 0.10mol / L~0.50mol / L, urea concentration is 0.10mol / L~0.50mol / L) Mix to make microbial cementing fluid, and keep the temperature at 4°C; c. Inject microbial cementing fluid 4 into the soil to be solidified through the low-temperature grouting equipment composed of 1, 2, 5, 6, and 7; d. After grouting After the soil temperature rises to 15°C, let it stand for 1 hour; e. Repeat steps c and d until the microbial cementing fluid cannot be injected into the soil or the soil strength meets the requirements, then stop grouting.

Description

technical field [0001] The invention relates to a method for microbiological low-temperature grouting and soil consolidation to improve the uniformity of soil strength and improve the grouting process to enhance soil strength, and belongs to the technical field of foundation soil reinforcement. Background technique [0002] The existing microbial grouting soil consolidation technology uses microbial induced calcium carbonate crystallization technology (MICP technology) by injecting microbial bacterial liquid and nutrient salts into the soil, and finally calcium carbonate crystals are rapidly precipitated in the pores between soil particles, and the soil particles pass through The cementation of calcium carbonate connects them into a whole and plays the role of solidifying the soil. At present, microbial normal temperature grouting is mainly used to solidify sand and silt in engineering. [0003] Technical solution of prior art one [0004] Microbial normal-temperature grout...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12C09K17/40C09K103/00
CPCC09K17/40C09K2103/00E02D3/12
Inventor 邵光辉冯建挺朱彦朱哲黄容聘
Owner NANJING FORESTRY UNIV
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