A Study of Liquefaction Potential on Retaining Wall and Embankment in Parangtritis Village

Abstract

AbstractParangtritis Village located in Bantul Regency, Special Region of Yogyakarta. Previous studies showed that the Opak Active Fault line passes right through the east side of the construction. This study aims to examine the potential for liquefaction in the retaining wall and embankment structures in Parangtritis Village in the event of an earthquake in the area. The subsurface evaluation was based on N-SPT drilling data as well as soil data at 4 drill point. The bedrock acceleration value was determined based on SNI 2833:2016. To obtain a more specific bedrock peak acceleration value, the Indonesian Spectra Design seismic data was used by the Directorate General of Highway, Ministry of Public Works and Housing, where the PGA bedrock acceleration value is 0.558 g. The stages of liquefaction potential analysis are divided into three stages, Cyclic Stress Ratio, Cyclic Resistance Ratio, Factor of Safety. Liquefaction Potential Index analysis as a determinant of potential damage. Data processing results at four drill points indicate that the soil layer at several depths has liquefaction potential with a safety factor value of <1. The results of these calculations show that the LPI value is in the LPI vulnerable > 15, indicating a high liquefaction potential.