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［ 15］ 中国水电十三局芜湖建设有限公司 . 青弋江分洪道工程稳定性分析报告［R］. 2016 .
Effect of nutrient solution concentration and microbial activity
on MICP solidified strength of soft clay
WANG Ziwen，WEI Ran，CAI Hong，XIAO Jianzhang，WU Shuaifeng
（State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，
China Institute of Water Resources and Hydropower Research，Beijing 100048，China）
Abstract： The microbial induced calcium carbonate deposition （MICP） technology of biomineralization has
the characteristics of small energy consumption，with great variety，rich resources and friendly environment.
More and more attention has been paid to improving the properties of sandy soil by using the good cementa⁃
tion ability of microbial calcium carbonate. Due to the special chemical composition and soil mechanical
properties of soft clay，microbial methods in the solidification of soft clay are still poorly understood. Based
on MICP technology， considering different nutrient solution concentration， microbial concentration and ure⁃
ase activity， this paper carried out a systematic shear strength analysis of low permeability solidified soft
clay，and further discussed the affecting factors of shear strength. The results show that the high enzyme ac⁃
tive microorganism should be selected as far as possible to solidify the soft clay. After curing， the shear
strength of the MICP solidified soft clay are improved significantly， and compared with the uncured sam⁃
ples， the internal friction angle increases by 3.96-5.52 times and the shear strength increases rapidly in
the early stage of curing. With the increasing concentration of nutrient solution， the internal friction angle
increases first and then decreases up to 28.10°。 The mixing method is more suitable for the soft clay by
MICP.
Keywords：MICP；soft clay；solidification；strength
（责任编辑：祁 伟）
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