微生物诱导CaCO_(3)加固土体的影响因素和应用进展

Influencing factors and application progress of microbial induced CaCO_(3) in soil reinforcement

近年来,微生物诱导碳酸钙沉淀(MICP)技术已经成为一种新兴的土体加固手段。基于微生物原理的MICP加固技术对于解决岩土工程中的各种问题具有显著的环保优势,因此得到诸多专业人士的重视,并开展了相关研究。详细介绍了微生物诱导碳酸钙沉淀的原理及其影响因素的研究进展,并对其在岩土工程中的具体应用进行综述。研究结果表明:微生物诱导碳酸钙沉淀是一个复杂的微生物化学过程,碳酸钙沉淀物的生成量及沉淀速率受多种因素影响,例如温度、pH值、加固方式等;MICP具有良好的流动性,生成具有胶结性的碳酸钙沉淀,减小土体孔隙,降低渗透性,在防渗封裂隙修复、土体加固等方面具有广泛的应用前景。

In recent years,microbial induced calcium-carbonate precipitation(MICP)technology has become an emerging method for soil reinforcement.Based on the microbial principle,the MICP reinforcement technology has significant environmental protection advantages for solving various problems in geotechnical engineering.Thus,it has received the attention of many professionals,and related research has been carried out.In this paper,the research progress on the principle and influencing factors of microbial-induced calcium carbonate precipitation is introduced in detail,and its specific application in geotechnical engineering is reviewed.Microbial-induced calcium carbonate precipitation is a complex microbial chemical process.The amount of calcium carbonate precipitate and the rate of precipitation are affected by many factors,such as carbon source,temperature and pH,reinforcement method,fiber parameters,fiber length,etc..MICP has good mobility,generates cementing calcium carbonate precipitation,reduces soil porosity,reduces permeability,and has a wide application prospect in seepage prevention and sealing fracture repair,soil reinforcement and other aspects.