Experimental Study on Influencing Factors and Mechanism of Microbial Soil Improvement Effect
ZHANG Minxia1,2,*, LIU Pengfei1, XU Ping1,2, XI Zhe1, ZHANG Chengye1
1 College of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China 2 Eco-Architecture and Environmental Construction Henan Engineering Technology Research Center, Jiaozuo 454003, Henan, China
Abstract: Microbially induced calcium carbonate precipitation (MICP) can effectively improve the physical and mechanical properties of engineering residue and significantly enhance its ability to resist wind erosion and dust generation. The key influencing factors of the improvement effect of microbial solidified soil were systematically analyzed by single factor orthogonal test of microbial solidified engineering residue. The microstructure, crystal structure and phase composition of microbial solidified engineering residue were measured by various microscopic tests, and the microstructure of microbial solidified engineering residue and the macro and micro mechanism of wind erosion and dust resistance were revealed. The results show that the concentration and dosage of bacteria liquid, the ratio of bacteria liquid to cementing liquid, the ratio of cementing liquid and the number of curing times have great influence on the curing effect. Based on this, the key parameters affecting the effect of microbial curing engineering muck are determined. From the microstructure analysis, it was found that a large amount of calcium carbonate precipitation was produced on the surface and between the pores of the soil particles of the microbial solidified engineering muck, which effectively enhanced the bon-ding performance between the soil particles, consolidated the upper soil particles into a hard shell layer with a certain thickness and strength, and greatly improved its wind erosion and dust resistance. By comparing and analyzing the reconstructed three-dimensional spatial structure of the original sample and the microbial solidified sample, it is found that the mineral precipitation of the soil improved by the microbial solidified soil is mostly concentrated in the upper part of the soil, and the porosity of the upper soil is also significantly smaller than that of the lower soil.
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2026, Vol. 40 
