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.
机构:
Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R ChinaHubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
Liu, Yiming
Liao, Xinchao
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Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R ChinaHubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
Liao, Xinchao
Li, Lihua
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Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R ChinaHubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
Li, Lihua
Mao, Haijun
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机构:
Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China
State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R ChinaHubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
机构:
Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Cui, Lan
Cao, Wenzhao
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MCC Grp, Cent Res Inst Bldg & Construct Shenzhen Co Ltd, Shenzhen 518055, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Cao, Wenzhao
Sheng, Qian
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Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Sheng, Qian
Xie, Mingxing
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Taiyuan Univ Technol, Coll Civil Engn, Taiyuan 030024, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Xie, Mingxing
Yang, Tao
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Huazhong Univ Sci & Technol, Inst Geotech & Underground Engn, Wuhan 430074, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Yang, Tao
Xiao, Ping
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Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Shenyang Univ Technol, Sch Architecture & Civil Engn, Shenyang 110870, Peoples R ChinaChinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
机构:
Power China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China
Zhejiang Engn Res Ctr Marine Geotech Invest Techn, Hangzhou 311122, Peoples R ChinaPower China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China
Shan, Zhigang
Zhang, Peng
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Ocean Univ China, Coll Engn, Qingdao 266100, Peoples R ChinaPower China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China
Zhang, Peng
Kou, Hailei
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Ocean Univ China, Coll Engn, Qingdao 266100, Peoples R ChinaPower China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China