Method for carrying out pressure grouting soil fixation by combining microorganisms with enzyme inhibitor

Abstract

The invention discloses a method for carrying out pressure grouting soil fixation by combining microorganisms with an enzyme inhibitor. The method comprises the steps that (1), a mixed single-liquid with the volume being 1-1.2 times of the pore volume of a to-be-fixed soil body area is injected into a grouting floral pipe by utilizing a grouting pump, wherein the mixed single-liquid comprises a microbial liquid, a culture solution, the inhibitor and a consolidating fluid; (2), the mixed single-liquid in the step (1) is injected into the to-be-fixed soil body area by utilizing a pressure pump,and the mixed single-liquid is left to stand for 10-15 hours after being completely injected; (3), deionized water is injected into the grouting floral pipe by utilizing an agent injecting pump; (4),the deionized water is injected into the soil body by utilizing the pressure pump; and (5), the operation from the step (1) to the step (4) is repeatedly carried out, and grouting is stopped until thestrength of the to-be-fixed soil body reaches the requirement or the mixed single-liquid cannot be injected into the to-be-fixed soil body. According to the method for carrying out pressure groutingsoil fixation by combining the microorganisms with the enzyme inhibitor, the biological activity of the microorganisms is not influenced, and meanwhile, the mixed single-liquid can be injected into the soil body around the grouting floral pipe quickly and efficiently to the greatest extent.

Description

technical field [0001] The invention relates to a method for soil consolidation by pressure grouting combined with enzyme inhibitors, and belongs to the technical field of soil reinforcement. Background technique [0002] Microbial soil stabilization technology is a newly developed soil reinforcement method in recent years. It uses microorganisms as a natural resource to improve soil, which is an environmentally friendly soil reinforcement technology. The existing microbial grouting soil consolidation technology first injects the microbial liquid into the soil through low pressure, and then injects the cementing solution, and uses the microbe-induced calcium carbonate crystallization technology (MICP technology), and finally precipitates rapidly in the pores between soil particles and preferentially deposits in the soil. Calcium carbonate gel crystallization at the corners of the contact points of soil particles without occupying large pore channels. Induced precipitation o...

AI Technical Summary

Problems solved by technology

This invention significantly improves the grouting rate of microbial soil fixation, and effectively solves the problem of easy blockage of the grouting port in the grouting soil fixation method by inhibiting microbial activity through boric acid. At the same time, combined with pressure grouting technology, the grouting liquid can be quickly , Penetrate into the surrounding soil to the greatest extent, effectively improve the uniformity of the strength of the grouted soil, enhance the strength of the soil to be fixed, and provide a new option for microbial grouting and soil consolidation

The inhibitor solidification scheme combined with the pressure grouting method significantly increases the grouting rate and effectively solves the problem that the microbial grouting port is easily blocked, effectively saves resources, reduces costs, optimizes the grouting process, and simplifies the grouting device. More economically viable, higher engineering value, and greener than previous grouting reinforcement methods

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