Geomechanics and Engineering

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Experimental study on Microbially Induced Calcite Precipitation for expansive soil stabilization

  • Zheng, Lu (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Yu, Qiu (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Jie, Liu (Transportation Planning Survey and Design Institute Co., Ltd.) ;
  • Chengcheng, Yu (CCCC Second Harbor Engineering Co., Ltd.) ;
  • Hailin, Yao (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences)
  • Received : 2022.06.09
  • Accepted : 2022.12.24
  • Published : 2023.01.10
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Abstract

Microbially induced carbonate precipitation (MICP) is extensively discussed as a promising topic for ground stabilization. The practical effect of stabilizing the expansive soil is presented in this paper with a logical process from the bacterial activity to the treatment technology. Temperature, pH, shaking frequency, and inoculation amount are discussed to evaluate the bacterial activity. The physic-mechanic properties are also evaluated to discuss the effect of the MICP process on expansive soil. Results indicate that the MICP method achieves the mitigation of expansion. The treated soil has a low proportion of fine particles (< 5 ㎛), the plasticity index significantly decreases, and strength values improve much. MICP process has a significant cementation effect on the soil matrix. Moreover, the infiltration model test presents the coating effect on the topsoil. According to the relation between the CaCO3 content and the treatment effect, the topsoil has better treatment than the deeper soil.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (42077262, 42077261 and 41972294)

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