| 基于生物诱导碳酸钙沉淀的土体固化研究进展 |
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| 引用本文： | 张茜,叶为民,刘樟荣,王琼,陈永贵.基于生物诱导碳酸钙沉淀的土体固化研究进展[J].岩土力学,2022,43(2):345-357. |
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| 作者姓名： | 张茜 叶为民 刘樟荣 王琼 陈永贵 |
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| 作者单位： | 1. 同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家重点研发计划(No.2019YFC1509900);国家自然科学基金(No.42030714,No.41807237)。 |
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| 摘 要： | 基于微生物或脲酶诱导碳酸钙沉淀（MICP/EICP）的土体固化技术是近年来岩土和地质工程领域的研究热点之一。在系统回顾基于生物诱导碳酸钙沉淀的土体固化技术发展历程的基础上，重点阐述了MICP/EICP固化机制、土体孔隙结构、菌液和脲酶性质、胶凝液性质和固化方式等方面对碳酸钙特性影响的研究进展。研究结果表明：土体孔隙越小，越不利于微生物或脲酶入渗，固化均匀性越差；土颗粒接触点越多，可为碳酸钙提供的沉积点位越多，碳酸钙与土颗粒间的黏结和桥接作用越强，固化效果越好；一定菌液或脲酶浓度或脲酶活性范围内，碳酸钙的生成速率和生成总量随浓度及活性的增大而增大，但过高的浓度或活性易导致碳酸钙生成速率过快，从而在土体注入端发生堵塞；低浓度胶凝液得到的碳酸钙晶体更小，在土体中的分布更均匀；采用合适的注浆饱和度可提高具有黏结作用的碳酸钙的占比；采用多层交替注入或单相低pH值注入可提高碳酸钙在试样中分布的均匀性。基于碳酸钙沉淀特性的影响因素，提高固化土体的均匀性，验证其耐久性，室内试验结果在现场尺度的适应性和改进方案应该成为以后研究的重点。
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| 关 键 词： | 微生物诱导碳酸钙沉淀 脲酶诱导碳酸钙沉淀 碳酸钙特性 脲酶 固化机制 |
| 收稿时间： | 2021-08-07 |
| 修稿时间： | 2021-10-19 |
Advances in soil cementation by biologically induced calcium carbonate precipitation |
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| ZHANG Qian,YE Wei-min,LIU Zhang-rong,WANG Qiong,CHEN Yong-gui.Advances in soil cementation by biologically induced calcium carbonate precipitation[J].Rock and Soil Mechanics,2022,43(2):345-357. |
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| Authors: | ZHANG Qian YE Wei-min LIU Zhang-rong WANG Qiong CHEN Yong-gui |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | Soil cementation technology based on microbially or enzyme induced calcium carbonate precipitation(MICP/EICP) is one of the hot topics in the field of geotechnical and geological engineering in recent years. In this study, a systematic review was performed on this technology, focusing on advances in the cementation mechanisms of MICP/EICP and the influence of soil pore structures, properties of bacterium, urease and cementation solution, and cementation methods on characteristics of calcium carbonate(CaCO3). The results indicate that the smaller the soil pores are, the more difficult the infiltration of microorganisms or urease is and the worse the cementation uniformity is. More contact points among soil particles will produce more deposition points for CaCO3,resulting in stronger bonding and bridging effects and better cementation effects. The generation rate and total amount of CaCO3 increase as the concentration of bacterium or urease and the activity of urease increase in a certain range. However, too high concentration or activity will induce a too high generation rate of CaCO3, resulting in clogging near the injection end. The calcium carbonate crystals obtained from low concentration cementation solution are relatively small and evenly distributed in the soil. The use of appropriate grouting saturation can increase the proportion of CaCO3 with bonding effect. Multilayer alternating injection or one-phase low pH injection can improve the distribution uniformity of CaCO3 in the sample. Based on influencing factors of CaCO3 precipitation characteristics, the improvement of cemented soil uniformity, durability verification, and the adaptability and improvement scheme of applying the laboratory test results to the field scale should be the focus points of the future research. |
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| Keywords: | microbially induced calcium carbonate precipitation(MICP) enzyme induced calcium carbonate precipitation(EICP) calcium carbonate characteristics urease cementation mechanism |
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