NUMERICAL STUDY OF SOIL STRUCTURE FOUNDATION INTERACTION TO DISTRIBUTION OF DYNAMIC LATERAL EARTH PRESSURE ON BASEMENT WALL DUE TO SATURATED LOOSE SAND LENSES

• Main Author: Dwi Nafisah, Anggit
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46515
• Institution: Institut Teknologi Bandung

Soil-structure interaction (SSI) is a method that considering interaction between building structure and soil material. Ostadan (2005) states that lateral earth pressure is a result of interaction between soil and structure when loaded by earthquake force and a fuction of all parameters that affected to that responses. Method that commonly used nowadays is two steps design that ignore the effect of mass and stiffness of the upper structure on designing the lower structure such as retaining or basement wall, meanwhile SSI method is rarely used. For several locations, loose-saturated-sand lenses often found and it is potentially liquefied when seismic loads are applied. This process could affect to the distribution and the amount of lateral earth pressure. The purpose of this research is to determine and analyze the distribution of lateral earth pressure on basement wall in seismic condition in soft clay with loose-saturated-sand lenses and also its effect to the lateral earth pressure on basement wall. Analyses are done using FLAC 2D with strain hardening model for clay soil and Finn-Bryne model for loose sand as constitutive model. For analyzing the effect of existence of loose sand lenses, depth of loose sand lenses, number of basement floor, existence of upper structure, PGA, and site class, variety of models should be done. This research show that the distribution and amout of lateral earth pressure are affected by loose-saturated-sand and other parameters mentioned. Ratio of excess pore water pressure and hydrodynamic force are also discussed in this research.