Journal
INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING
Volume 15, Issue 8, Pages 994-1007Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19386362.2020.1836113
Keywords
Microbial-induced calcite precipitation; residual soil; isotropic consolidation; undrained shear strength
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Funding
- Universiti Tunku Abdul Rahman [IPSR/RMC/UTARRF/2017-C1/L06]
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Microbial-induced calcite precipitation can increase the isotropic yield stress and reduce the compression index of residual soil. The bio-mediated residual soil shows greater radial resistance compared to untreated soil when subjected to isotropic pressure.
Microbial-induced calcite precipitation has recently emerged as an attractive sustainable ground improvement technique. In present study, the stress-deformation responses of a bio-mediated residual soil in Malaysia were investigated through undrained triaxial compression tests with different isotropic consolidation pressures. A practical and effective bio-mediation treatment method for residual soil was proposed. Bio-mediation increased the residual soil isotropic yield stress from 40 kPa to 100 kPa attributed to the greater inter-particle resistances contributed by calcite precipitation. The soil compression index was also reduced from 0.188 to 0.071. The bio-mediated residual soil showed a greater radial resistance than its untreated counterpart when subjected to an isotropic pressure. Under isotropic consolidation pressure below the yield stress, the shear strength of bio-mediated soil was governed predominantly by the calcite content. However, beyond the yield stress, the calcite bonds would diminish and only a slight increase of ultimate shear strength was observed attributed to calcite densification.
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