碳酸钙
离散元法
降水
粒子(生态学)
碳酸盐
随机性
材料科学
地质学
矿物学
岩土工程
复合材料
机械
冶金
数学
物理
统计
气象学
海洋学
作者
Huanran Wu,Wentao Xiao,Xiang He,Jinquan Shi,Hanlong Liu,Yang Xiao
出处
期刊:Lecture notes in civil engineering
日期:2022-07-31
卷期号:: 546-553
标识
DOI:10.1007/978-3-031-12851-6_65
摘要
Microbially induced calcium carbonate precipitation (MICP) has the capability to improve engineering properties of sands and has attracted plenty of attentions recently. 3D discrete element modeling is conducted herein to investigate the MICP process from the perspective of micromechanics. The sand particles are represented by large particles and the calcium carbonate (CaCO3) formed during the MICP process are modeled with fine particles. The sand skeleton is formed first with coarse particles only, and random fine particles are generated within the pore space of the skeleton thereafter. The fines precipitate to the interparticle contacts or particle surfaces under random external driving forces, which is designed to mimic the MICP process in reality. Different roles of fines, including pore-filling, coating and bonding, are formed naturally during the virtual precipitation process given the randomness. The good agreement between the numerical results and the experimental data validates the proposed model and proves its capability and potential for modeling the mechanical responses of MICP-treated sands and analyzing the underlying mechanisms.
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