Microbial ecological modification method for expansive soil

A microbial ecology and expansive soil technology, which is applied in soil protection, chemical instruments and methods, building construction, etc., can solve the problems of expansive soil expansion characteristics that are difficult to be green and environmentally friendly, and achieve the purpose of reducing expansiveness, enhancing soil strength, The effect of improving the soil

Active Publication Date: 2022-07-12
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a microbial ecological modification method of expansive soil to solve the technical problem in the prior art that the expansion characteristics of expansive soil are difficult to carry out on the premise of environmental protection

Method used

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  • Microbial ecological modification method for expansive soil
  • Microbial ecological modification method for expansive soil
  • Microbial ecological modification method for expansive soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A kind of microbial ecological modification method of expansive soil, its mechanism is as follows image 3 shown, including:

[0077] S1. Weak expansive soil and medium expansive soil from Jiangjihuai, and Handan strong expansive soil are respectively sieved with 2 mm and dried for later use to obtain expansive soil to be modified, and then obtain pasteurized spores with strong urease-producing ability and environmental adaptability Sarcinus saccharomyces bacteria liquid, wherein the used sporococcus saccharides can survive in an alkaline environment (pH=7-13) and in areas with large temperature changes (15°C to 60°C);

[0078] S2. urea and calcium salt are mixed according to preset molar concentration to obtain cementing solution;

[0079] S3. Mix the Bacillus Pasteurella bacteria liquid and the cementitious liquid according to a preset volume ratio, and then add it to the expansive soil to be modified for mixing to obtain a sample;

[0080] S4. The sample is maintai...

Embodiment 2

[0092] Comparing Embodiment 2 and Embodiment 1, the difference between Embodiment 2 and Embodiment 1 is:

[0093] S31. Obtain the optimal moisture content of the expansive soil in the Yangtze River-Jihuai expansive soil and the expansive soil in the Jiang-Jihuai expansive soil;

[0094] S32. Select the preset volume ratio to obtain the selected volume ratio;

[0095] S33. Pasteurella saccharomyces bacteria liquid and cementation liquid are added in the expansive soil in the Jiangxi Huai River according to the selected volume ratio, and then mixed to obtain the mixed expansive soil;

[0096] S34. Detect the mixed expansive soil to obtain the moisture content of the mixed expansive soil;

[0097] S35. According to the moisture content and the selected volume ratio of the mixed expansive soil, draw a standard curve of the moisture content and the selected volume ratio, wherein the specific steps are as follows:

[0098] S511. Take the bacterial liquid cultured in the same batch...

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Abstract

The invention relates to the field of environmental geotechnical engineering, in particular to a microbial ecological modification method for expansive soil. The method comprises the following steps: respectively obtaining to-be-modified expansive soil and a sporosarcina pasteurii bacterial solution; mixing urea and calcium salt to obtain a cementing liquid; mixing the sporosarcina pasteurii bacterial liquid and the cementing liquid according to a preset volume ratio, and then adding the mixture into to-be-modified expansive soil for mixing to obtain a sample; maintaining the sample to obtain the green and environment-friendly modified expansive soil. By adopting sporosarcina pasteurii, urea can be continuously hydrolyzed into NH4 < + > and CO3 < 2->, meanwhile, Ca < 2 + > in expansive soil and added CaCl2 is continuously attracted to the surfaces of thalli, and Ca < 2 + > and CO3 < 2-> are combined on the surfaces of the thalli to form calcium carbonate crystals, so that the soil body strength of the expansive soil is enhanced; meanwhile, residual NH4 < + > and Ca < 2 + > in the reaction system can reduce the expansibility of the expansive soil through the effects of neutralizing negative charges and replacing cations respectively.

Description

technical field [0001] The present application relates to the field of environmental geotechnical engineering, in particular to a microbial ecological modification method of expansive soil. Background technique [0002] Expansive soil is a cohesive soil with many fissures naturally formed under geological action and has significant expansion and contraction characteristics. Because it contains more hydrophilic minerals such as montmorillonite and illite, it is very sensitive to water. It is also often encountered in civil and hydraulic engineering, causing damage to many infrastructures, so it is also called "disaster soil". [0003] Therefore, in the current direction of environmental geotechnical engineering, it is necessary to improve the expansive soil first, and the current improvement methods mainly include physical improvement and chemical improvement. A certain proportion of fiber or weathered sand can improve soil strength and reduce expansion, but the engineering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12C09K17/40C09K103/00
CPCE02D3/126C09K17/40C09K2103/00
Inventor 胡波刘浩林宋诚龚壁卫邱金伟童军李波刘军郑郧李从安
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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