Discrete Element Study on Mechanical Properties of MICP-Treated Sand under Triaxial Compression

被引:0
|
作者
Xie, Liquan [1 ]
Zhou, Jingsong [1 ]
Shen, Li [2 ]
Ji, Yifan [1 ]
Li, Wenlin [1 ]
Cheng, Yaofei [3 ]
机构
[1] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
[2] Tongji Univ, Sch Med, Shanghai 200092, Peoples R China
[3] Guangxi Pinglu Canal Construct Co Ltd, Nanning 535000, Peoples R China
关键词
microbial-induced calcium carbonate precipitation (MICP); discrete element method; shear strength; precipitation mode; microscopic mechanism; INDUCED CARBONATE PRECIPITATION; DISTRIBUTIONS; OPTIMIZATION; DEFORMATION; SIMULATIONS;
D O I
10.3390/jmse12091503
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Microbial-induced calcium carbonate precipitation (MICP) has attracted much attention as a promising technology for soil improvement in the infrastructures of marine engineering. This paper introduces a novel numerical sample preparation technique for MICP-treated sand, with particular attention paid to the distribution patterns of calcium carbonate, including contact cementing, bridging, and grain coating. The effect of calcium carbonate content (CCC) on the deformation and failure mechanism is studied at macroscopic and granular scales. The findings show that a small amount of calcium carbonate can quickly increase the strength of sand. The strength improvement and deformation control of MICP technology are better than those of traditional compaction treatment. As the calcium carbonate content increases, the mechanical coordination number of the sand also increases, indicating a more stable microstructure of the sand phase. In the contact bonding mode, initial failure occurs as shear failure between sand and calcium carbonate. In the bridge mode, initial failure manifests as shear failure between calcium carbonate particles. In the coating mode, initial failure occurs as tensile failure between sand and calcium carbonate. Calcium carbonate contributes to a reduction in both sliding and rolling movements among sand particles.
引用
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页数:19
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