微生物加固粉土的强度特性及加固机理研究

doi:10.11896/cldb.23010024

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Abstract The microbial induced calcium carbonate precipitation (MICP) technology was used to strengthen the widely distributed Yellow River alluvial silt in North China for its poor grading and weak strength. The strength characteristics of MICP-reinforced silt were analyzed by triaxial tests;the microscopic mechanism was analyzed by microstructure tests;the macroscopic phenomenon combined with the microscopic mechanism revealed the strength reinforcement mechanism. The results showed that the strength of silt was greatly improved after MICP reinforcement;its cohesion and internal friction angle increased with the increase of the number of reinforcement rounds and cement concentration, and the growth rate showed a trend of faster and then slower;the reinforcement efficiency was higher at the cement concentration of 0.5 mol/L and two rounds of reinforcement. In terms of microstructure, the pores in the soil sample gradually decreased with the increase of cement concentration and the number of reinforcement rounds;the average non-porous area ratio of the soil sample cross-section increased with the increase of the number of reinforcement rounds and cement concentration;the cohesion, internal friction angle and the average non-porous area ratio all conformed to the bilinear increasing relationship of fast and then slow. The reason for the increase in cohesion and internal friction angle is that the calcium carbonate produced by the MICP reinforcement increases the average non-porous area ratio by binding the soil particles and filling and blocking the inter-particle pores, thus increasing the strength of the soil.

Key words： microbial induced calcite precipitation (MICP) cohesive force internal friction angle average non-pore area ratio strengthening mechanism

Published: 10 July 2024 Online: 2024-08-01

CLC number:

TU411

Fund:National Natural Science Foundation of China (42172299, 41972279).

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	Articles by authors
	PENG Liyun
	CHEN Xing
	QI Jilin
	ZHU Tongyu

Cite this article:

PENG Liyun,CHEN Xing,QI Jilin, et al. Study on Strength Characteristics and Strengthening Mechanism of Microbial Reinforced Silt[J]. Materials Reports, 2024, 38(13): 23010024-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23010024 OR http://www.mater-rep.com/EN/Y2024/V38/I13/23010024

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