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Microorganism low-temperature grouting and soil reinforcing method

A technology of microorganisms and microbial glue, applied in chemical instruments and methods, soil protection, building structure, etc., can solve the problems of uneven grouting of microorganisms at room temperature, etc. blocking effect

Active Publication Date: 2016-06-29
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

Method used

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  • Microorganism low-temperature grouting and soil reinforcing 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 microorganism low-temperature grouting and soil reinforcing method comprises the steps that a, a grouting shock tube 2 of a low-temperature grouting device is driven into a foundation 3; b, a microorganism with biological enzyme centrifugally separated out and removed is used for preparing low-temperature bacterium liquid at the temperature being 4 DEG C, the low-temperature bacterium liquid is mixed with mixed liquid of calcium chloride and urea at the temperature being 4 DEG C to prepare microorganism consolidating liquid, and the temperature is kept to be 4 DEG C, wherein the concentration OD600 of the bacterium liquid is about 1.2, the concentration of the calcium chloride of the mixed liquid ranges from 0.10 mol / L to 0.50 mol / L, and the concentration of the urea of the mixed liquid ranges from 0.10 mol / L-0.50 mol / L; c, the microorganism consolidating liquid 4 is poured into a to-be-cured soil body through a low-temperature grouting device composed of 1,2,5,6 and 7; d, after the temperature of the soil body obtained after grouting is increased to 15 DEG C and is subject to the constant temperature, standing is conducted for 1 h; and e, the step c and the step d are repeated, and grouting is stopped till the microorganism consolidating liquid cannot be injected into the soil body or the strength of the soil body meets the requirement.

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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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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