Mechanical behaviour and microstructure of granite residual bio-cemented soil by microbially induced calcite precipitation with different cementation-solution concentrations
文献类型：期刊论文
| 作者 | An, Ran1,2; Gao, Haodong2,3; Zhang, Xianwei2; Chen, Xin3; Wang, Yixian1; Xu, Hao3 |
| 刊名 | ENVIRONMENTAL EARTH SCIENCES
 |
| 出版日期 | 2024 |
| 卷号 | 83期号:1页码:13 |
| 关键词 | MICP Granite residual soil Mechanical behaviour Microstructure Cementation-solution concentration |
| ISSN号 | 1866-6280 |
| DOI | 10.1007/s12665-023-11352-w |
| 英文摘要 | Microbially induced calcite precipitation (MICP) stands as an environmentally friendly and promising technique for enhancing the performance of soil. Bacteria catalyze the hydrolysis of urea, prompting calcium ions to react with carbonate ions, ultimately forming calcium carbonate precipitation as a cement within soil grains. However, studies of using MICP to enhance granite residual soil (GRS) that is recognized as a problematic soil because of its wide grain size distribution are relatively rare. In this present study, bio-cemented GRS samples were prepared through grouting with Sporosarcina pasteurii as the colony and a mixture of urea and calcium chloride as the cementation solution. The effect of cementation-solution concentrations on the mechanical properties of the bio-cemented samples was analyzed through unconfined compression and triaxial shear tests. Furthermore, X-ray computerized tomography, scanning electron microscopy, and X-ray diffraction experiments were performed to reveal the mechanism of MICP from a microscopic perspective. The experimental results indicate that an optimal concentration of 2 mol/L achieved the highest level of cementation, resulting in an impressive 47.15% increase in the unconfined compressive strength of the GRS samples. The triaxial shear strength and stress paths of bio-cemented samples were affected by the cementation level. The variation of porosity indicated that CaCO3 precipitation improves soil densification by filling the macropores among the soil grains. The CaCO3 precipitates from the MICP treatment predominantly exist in the form of calcite crystals, serving to fill, wrap, and cement within the soil structure, thereby enhancing the cohesive and frictional forces exerted by the bio-cemented grains. |
| 资助项目 | National Natural Science Foundation of China[12102312] ; National Natural Science Foundation of China[42177148] ; National Natural Science Foundation of China[SKLGME021018] ; Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[SKLGP2021K011] ; Open Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001130365600008 |
| 出版者 | SPRINGER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40295]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | An, Ran; Zhang, Xianwei |
| 作者单位 | 1.Hefei Univ Technol, Sch Civil & Hydraul Engn, Hefei, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Wuhan Univ Sci & Technol, Sch Urban Construct, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | An, Ran,Gao, Haodong,Zhang, Xianwei,et al. Mechanical behaviour and microstructure of granite residual bio-cemented soil by microbially induced calcite precipitation with different cementation-solution concentrations[J]. ENVIRONMENTAL EARTH SCIENCES,2024,83(1):13. |
| APA | An, Ran,Gao, Haodong,Zhang, Xianwei,Chen, Xin,Wang, Yixian,&Xu, Hao.(2024).Mechanical behaviour and microstructure of granite residual bio-cemented soil by microbially induced calcite precipitation with different cementation-solution concentrations.ENVIRONMENTAL EARTH SCIENCES,83(1),13. |
| MLA | An, Ran,et al."Mechanical behaviour and microstructure of granite residual bio-cemented soil by microbially induced calcite precipitation with different cementation-solution concentrations".ENVIRONMENTAL EARTH SCIENCES 83.1(2024):13. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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