Liquefaction is a phenomenon associated with loose, saturated cohesionless soil subjected to cyclic loading (earthquake-induced loading) resulting in partial or complete loss of stiffness of soil. Liquefaction is observed to be one of the most devastating phenomena during earthquakes. The north-central region of India lies in a seismically vulnerable zone, which, accompanied by alluvial sandy deposits and a shallow groundwater table, makes soil susceptible to liquefaction. The current study describes the approach used to evaluate and mitigate liquefaction at a brown-field project site in this region. Soil investigation using Standard Penetration Test (SPT) and Electric Cone Penetration Test (eCPT) is adopted to evaluate the liquefaction potential and its consequences. Subsequently, ground improvement using vibro stone columns is designed for mitigation of liquefaction. The proposed structure is a mounded storage vessel (MSV), which is sensitive to the settlement, and the vibro stone columns were designed to ensure the serviceability criteria of the MSVs. This optimal foundation solution was verified using eCPTs conducted after ground improvement works, which showed that the liquefaction was successfully mitigated.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Evaluation and Mitigation of Liquefaction for Sandy Alluvial Deposit in Central India

  • Tanmay Gupta,
  • Madan Kumar Annam

摘要

Liquefaction is a phenomenon associated with loose, saturated cohesionless soil subjected to cyclic loading (earthquake-induced loading) resulting in partial or complete loss of stiffness of soil. Liquefaction is observed to be one of the most devastating phenomena during earthquakes. The north-central region of India lies in a seismically vulnerable zone, which, accompanied by alluvial sandy deposits and a shallow groundwater table, makes soil susceptible to liquefaction. The current study describes the approach used to evaluate and mitigate liquefaction at a brown-field project site in this region. Soil investigation using Standard Penetration Test (SPT) and Electric Cone Penetration Test (eCPT) is adopted to evaluate the liquefaction potential and its consequences. Subsequently, ground improvement using vibro stone columns is designed for mitigation of liquefaction. The proposed structure is a mounded storage vessel (MSV), which is sensitive to the settlement, and the vibro stone columns were designed to ensure the serviceability criteria of the MSVs. This optimal foundation solution was verified using eCPTs conducted after ground improvement works, which showed that the liquefaction was successfully mitigated.