Microbially induced calcium carbonate precipitation (MICP) uses the metabolic function of microbes to carry out biochemical reactions with other substances in the environment. Through the controlled growth of inorganic minerals, soil particles are cemented and soil pores are filled to solidify the soil and reduce its permeability. Thus, the application of this technology was foreseen in geotechnical engineering and environment (building antiseepage, contaminated soil restoration, slope soil erosion, and sand liquefaction). In this review article, based on current research findings, the urea hydrolysis and the cementation mechanism of MICP are briefly described. The influences of factors such as enzyme activity, cementation solution concentration, pH, temperature, grouting method, and particle size on MICP-treated soil are discussed. The engineering properties of MICP-treated soils are evaluated, for instance, the strength, stiffness, liquefaction resistance, permeability, and durability. The applications of MICP technology in ground improvement, geotechnical seepage control, foundation erosion resistance, and fixation of heavy metals are summarized. Finally, future directions of the development of MICP technology are elucidated to provide a reference and guidance for the promotion of MICP technology in the geotechnical engineering field.

中文翻译：

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微生物诱导碳酸钙沉淀 (MICP) 固化土壤的岩土工程特性

微生物诱导碳酸钙沉淀（MICP）利用微生物的代谢功能与环境中的其他物质进行生化反应。通过无机矿物质的受控生长，土壤颗粒被胶结，土壤孔隙被填充，从而使土壤固化并降低其渗透性。因此，这项技术在岩土工程和环境（建筑防渗、污染土壤修复、斜坡土壤侵蚀和沙土液化）中的应用是预见性的。在这篇综述文章中，基于目前的研究成果，简要描述了 MICP 的尿素水解和胶结机理。讨论了酶活性、胶结液浓度、pH值、温度、灌浆方法、粒径等因素对MICP处理土壤的影响。评估 MICP 处理土壤的工程特性，例如强度、刚度、抗液化性、渗透性和耐久性。综述了MICP技术在地基改良、岩土防渗、地基抗侵蚀、重金属固定等方面的应用。最后阐述了MICP技术未来的发展方向，为MICP技术在岩土工程领域的推广提供参考和指导。