STUDY ON DYNAMIC ANALYSIS OF STONE COLUMN BEHAVIOUR IN LIQUEFIABLE SOIL

• Main Author: ROHIMAH, GHIFARIYATU
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/60911
• Institution: Institut Teknologi Bandung

The Refinery Development Master Plan Program (RDMP) is one of the types of infrastructure needed to support economic growth to increase national energy. In this final project, design of soil improvement for tank foundation was proposed so that the tank can perform satisfactorily. Stone column was selected as ground improvement method that allows densification of liquefiable loose sand. The design process of stone column is based on column capability to dissipate excess pore water pressure in case of earthquake. This can happen because the permeability of the stone column is higher than the surrounding soil. Also, to mitigate liquefaction, the stone column will increase the stiffness of the soil which causes the Cyclic Stress Ratio (CSR) value to decrease, and in the installation process, the stone column will possibly increase density of soil so that the Cyclic Resistance Ratio (CRR) value increases. Based on the design concept, the stone column configuration results are obtained in the form of a square, diameter stone column 0.8 and 0.5 meters with a spacing of 1.5 m and 3 m, and installation depth 15m. The objective of the study is to find out the relationships between earthquake loading and stone column configuration on increases of excess pore water pressure. The independent variables used in this study are input ground motion with 8 earthquake accelerations and stone column configuration. The liquefaction potential analysis is conducted numerically by using a finite difference method FLAC Dynamic 2D software. From this modeling, it can be seen that the ability of stone column to mitigate liquefaction. In addition, recommendations for the relationship between excess pore water pressure, PGA, and stone column configuration are presented in this study.