Analysis of pile foundation in liquefied soil with encased stone column

In this paper composite pile foundation with encased stone column is studied for loose sandy soil. One of the mainreasons for the failure of a structure in sandy soil is soil liquefaction caused by the earthquake. Stone column is one of the best techniques used in foundation system to mitigate the liquefaction of soil. In this study stone columns encased with geogrid are used to show that vertical deformation can be reduced. As a case study, a pile foundation system is designed for an RCC structure. This RCC structure is modeled in ETABS and the loads transferred to the foundation system are determined. The pile, pile cap and the stone columns are designed for this load as per IS standards. This composite foundation system is analyzed using ANSYS Workbench. A parametric study is conducted by varying the diameter and length of the stone columns. This study’s goal is to examine the overall vertical deformation of a pile of liquefiable soil. The findings show that the vertical deformation of the composite foundation is reduced as the diameter and depth of the encased stone column are increased.