Method for consolidating subsoil through microorganisms in circulating grouting mode

Abstract

A method for consolidating subsoil through microorganisms in a circulating grouting mode includes the steps that a, grout injecting pipes and grout extracting pipes are inserted into the subsoil to be consolidated at intervals; b, microorganism bacterial liquid is circularly injected into the subsoil through the grout injecting pipe (I) and the grout extracting pipe (I'); c, a cement solution is circularly injected into the subsoil through the grout injecting pipe (II) and the grout extracting pipe (II'); d, the extraction and injection functions of the grout injecting pipe (I) and the grout extracting pipe (I') are interchanged, and the microorganism bacterial liquid is made to circularly injected into the subsoil in the opposite direction; e, the extraction and injection functions of the grout injecting pipe (II) and the grout extracting pipe (II') are interchanged, and the cement solution is circularly injected into the subsoil in the opposite direction; and f, the steps b, c, d and e are repeated until the subsoil meets the consolidation requirement. A grouting system with integrated extraction and injection, alternation of positive circulation and negative circulation and orthogonal streamlines is formed in the subsoil through the microorganism circulating grouting mode, the microorganism bacterial liquid and the cement solution can be rapidly and uniformly injected into the subsoil and react to generate calcium carbonate sand or powder with loose cementing, and a composite subsoil with high bearing capacity is formed.

Description

technical field [0001] The invention relates to a method for strengthening foundation by microbial circulation grouting, which belongs to the technical field of foundation treatment. Background technique [0002] As an emerging technology for foundation treatment, microbial grouting has the advantages of small construction disturbance, low pouring pressure, long diffusion distance, short construction period and good ecological compatibility. As a new method of sustainable soil reinforcement, it has a wide range of application prospects, and has increasingly attracted the attention of the geotechnical engineering community and has begun to be applied in engineering; the existing microbial injection Slurry technology generally adopts the step-by-step circulation grouting method of microbial bacterial liquid and cementing solution, because the microbial bacterial liquid and cementing solution will quickly form calcium carbonate crystals after meeting around the pipe, which will...

AI Technical Summary

Problems solved by technology

[0011] Technical problem: The purpose of the present invention is to overcome the problems and deficiencies of the current microbial grouting technology, such as difficult grout injection, uneven reinforcement, small effective radius of reinforcement, and low utilization rate of grout materials, thereby inventing a microbial circulation grouting reinforcement foundation. method, a new grouting technology is proposed, which combines the pumping and injection of microbial bacterial liquid and cementing solution, alternating positive and negative cycles, and orthogonal streamlines.

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