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Microbial induced calcite precipitation (MICP) is a low-cost, low-maintenanceenvironmentally sustainable soil restoration technology. It has excellent potential to decrease the hydraulic conductivity and enhance the shear resistance of soil through calcite precipitation and filling of voids. Thereby, the technique can be applied in-situ to resolve the issues related to liquefaction, erosion, settlements, and frost damage. An attempt was also made in the present study to employ surfactant for further enhancement of strength in microbially-induced cemented sandy soil. Various volumes (50 ml in each layer) of non-ionic surfactants such as Nonidet P-40 were applied to soils with various amounts (approximately 150 ml in each layer) of bacteria (Sporosarcina pasturii) content, and these soils were treated with MICP using a mixing process. Laboratory tests viz. unconfined compression strength (UCS), triaxial, and ultra-sonic pulse velocity (UPV) was performed to examine the shear strength improvement of the studied soil. It was observed that a large amount of shear strength improvement in the studied soil through MICP treatment alone and surfactant induced MICP treatment, respectively. Moreover, the rate of strength improvement is faster (13 days) in case of surfactant mixed MICP as compared to the solely MICP treated soil.

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Increase of Strength of Pure Sandy Soil Under Drained Conditions by MICP Treatment

  • 会议论文

  • 发表日期：

    2025年

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  • Soumik Dana,
  • Sunanda Mondal,
  • Supriya Pal,
  • Sufia Khannam Kazy

摘要

Microbial induced calcite precipitation (MICP) is a low-cost, low-maintenanceenvironmentally sustainable soil restoration technology. It has excellent potential to decrease the hydraulic conductivity and enhance the shear resistance of soil through calcite precipitation and filling of voids. Thereby, the technique can be applied in-situ to resolve the issues related to liquefaction, erosion, settlements, and frost damage. An attempt was also made in the present study to employ surfactant for further enhancement of strength in microbially-induced cemented sandy soil. Various volumes (50 ml in each layer) of non-ionic surfactants such as Nonidet P-40 were applied to soils with various amounts (approximately 150 ml in each layer) of bacteria (Sporosarcina pasturii) content, and these soils were treated with MICP using a mixing process. Laboratory tests viz. unconfined compression strength (UCS), triaxial, and ultra-sonic pulse velocity (UPV) was performed to examine the shear strength improvement of the studied soil. It was observed that a large amount of shear strength improvement in the studied soil through MICP treatment alone and surfactant induced MICP treatment, respectively. Moreover, the rate of strength improvement is faster (13 days) in case of surfactant mixed MICP as compared to the solely MICP treated soil.