1 School of Civil and Traffic Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China 2 Beijing International Science and Technology Cooperation Base of Urban Transportation Infrastructure Construction, Beijing 100044, China 3 Shandong Rail Transit Survey and Design Institute Co., Ltd., Jinan 250101, China
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.
通讯作者: *齐吉琳,北京建筑大学土木与交通工程学院二级教授、博士研究生导师。1992年兰州大学水文地质与工程地质学专业本科毕业,1995年中国地震局兰州地震研究所地震地质学专业硕士毕业、1999年西安理工大学岩土工程学专业博士毕业。目前主要从事寒区岩土工程和特殊土力学等方面的研究。发表论文120余篇,包括Acta Geotechnica、Engineering Geology、Cold Regions Science and Technology、《岩土工程学报》《岩土力学》《岩石力学与工程学报》和《冰川冻土》等,SCI引用1 100余次,H因子为20。jilinqi@bucea.edu.cn
作者简介: 彭丽云,北京建筑大学土木与交通工程学院教授、博士研究生导师。2004年7月、2008年10月于北京交通大学获得工学学士学位和博士学位。目前主要从事特殊土力学、土体加固改良技术和城市地下工程风险分析与评估等方面的研究。发表论文30余篇,包括Construction and Building Material、《岩土工程学报》《岩土力学》《冰川冻土》,授权专利4项,出版专著2部。
引用本文:
彭丽云, 陈星, 齐吉琳, 朱同宇. 微生物加固粉土的强度特性及加固机理研究[J]. 材料导报, 2024, 38(13): 23010024-7.
PENG Liyun, CHEN Xing, QI Jilin, ZHU Tongyu. Study on Strength Characteristics and Strengthening Mechanism of Microbial Reinforced Silt. Materials Reports, 2024, 38(13): 23010024-7.
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