微生物诱导碳酸钙固化土体研究进程

Research progress on soil improvement by microbial induced CaCO_(3)precipitation

微生物诱导碳酸钙沉淀是一种绿色环保的土体加固技术,但其固化受诸多因素影响,通过对国内微生物诱导碳酸钙相关文献进行梳理,从研究微生物固化的机理出发,归纳总结微生物固化中影响因素(温度、注浆方式、菌液浓度等方面)对生物固化土的影响,并对固化后部分物理性质进行总结,发现脲酶在30℃培养温度下,菌液的活性与浓度最高,在20~40℃,浓度适中的环境下,能生成更多的碳酸钙,分布更加均匀,且此技术在土体加固、修复等领域具有非常广阔的前景,提出未来可研究的方向,如生成的碳酸钙分布不均等。

The microbial induced CaCO_(3)precipitation(MICP)is a green environmental reinforcement technique for soil improvement.However,the progress of reinforcement is influenced by a large number of factors.Through the domestic literature review in MICP of the carding,based on the research of microbial-induced calcium carbonate precipitation,the paper summarized the influence of influencing factors(temperature,grouting methods,microbial concentration,and so on)on the bio-cured sand in the process of the MICP and also summarized the physical property of reinforced soil,indicating urease activity and concentration will reach the highest at 30℃.In the 20~40℃,at a good grain composition and more calcium carbonate will be produced and uniformly distributed on the surface.Meanwhile,the technique makes it a broad engineering application prospect in soil improvement,restoration,etc.In the last part of the paper,we proposed some feasibility studies for the future such as the resulting calcium carbonate precipitation unevenly distributed,etc.