LIQUEFACTION POTENTIAL ANALYSIS IN TRANS – SULAWESI RAILWAY, POLEWALI MANDAR-MAJENE SEGMENT USING CONE PENETRATION TEST METHOD

Abstract

rans-Sulawesi Railway is the first railway in Sulawesi. One of the segments that is passed by this railway is Polewali Mandar-Majene segment, West Sulawesi, which became the research area. The research area mostly contains of Quaternary sediments such as alluvial. Liquefaction may occur because of earthquake that causes loss of strength within soils. Most of the cases, liquefaction occur in Quaternary sediments that are decomposed, loose, and unconsolidated. So, liquefaction analysis is needed on the research area to determine the liquefaction potential that might happen there. Liquefaction potential analysis was carried out using cone penetration test method (CPT). The analysis conducted is liquefaction trigger analysis.

The analysis was carried out by calculating liquefaction safety factor (FS_L) and liquefaction potential index (LPI) at 14 CPT sites with varying depth from 3,8 meters – 14 meters. Based on the analysis, the liquefaction safety factor (FS_L) value obtained shown that the 14 CPT sites has a potential for liquefaction with Mw 7,5 earthquake because the FS_L values are less than 1. Based on the calculation of liquefaction potential index (LPI), the research area is in the high – highest category.