Test device for reinforcing soil body based on MICP technology and use method

Abstract

The invention discloses a test device for reinforcing a soil body based on an MICP technology and a use method. The device is composed of a sample preparation mold and a liquid injection auxiliary system. The sample preparation mold comprises a semicircular three-dimensional thin-wall groove cylinder, a thin-wall round cover with slotted edges, an octagonal prism supporting rod and a solid anti-seepage strip; the liquid injection auxiliary system comprises a device base, a three-dimensional hollow side plate, a side plate connecting and fixing plate, a movable hollow upper sealing cover and a drawer type waste liquid collecting bin. When a microorganism solidification aeolian sand sample is prepared, aeolian sand is filled into a sample preparation mold, thin-wall round covers with slotted edges are buckled at the two ends, a solid anti-seepage strip is embedded into the slotted position of the mold, the sample preparation mold is fixed in a liquid injection auxiliary system through an octagonal prism supporting rod, and after liquid is circulated through a peristaltic pump, the sample preparation mold is filled with the solid anti-seepage strip. And the liquid is conveyed to the opening in the groove through the liquid injection hose for injection. The method has the characteristics that the material consumption is reduced, the phenomenon of non-uniform pouring caused by solidification of part of soil is avoided, and the pouring efficiency and the reinforcing effect can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of microbial grouting test, and in particular relates to a test device and a use method for soil reinforcement based on MICP technology. Background technique [0002] Microbial-induced calcium carbonate precipitation (MICP) technology is an emerging soil reinforcement technology in recent years. It has received more and more attention in the field of geotechnical engineering due to its environmental friendliness, cost savings, and simple operation. The bacteria used is a facultative anaerobic Bacillus pasteuri. If urea and calcium-dissolved liquid are cultured in moist soil, calcium carbonate metabolites can be produced between soil particles, and loose soil can be removed. The particles are cemented into a whole, thereby improving the mechanical properties such as soil strength and permeability. Microbial-induced calcium carbonate precipitation to strengthen soil technology has broad application prospects....

AI Technical Summary

Problems solved by technology

[0003] The traditional microbial-induced calcium carbonate precipitation technology is to use Bacillus pasteuriani to migrate in the soil to precipitate calcium carbonate to strengthen the soil, but because the bacteria migrate unevenly in the soil, they mainly stay on the surface layer of the solidified soil , so that the soil reinforcement effect is not uniform, which is a major limitation of the traditional microbial-induced calcium carbonate precipitation technology

[0004] The present invention proposes a test device and method for solidifying soil based on MICP technology, focusing on solving the problem of uneven solidification in soil reinforcement

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