COMPARATIVE ANALYSIS AND EVALUATION OF LIQUEFACTION POTENTIAL ASSESMENT METHODS BASED ON CPTU DATA IN RECLAMATION ISLAND, PANTAI INDAH KAPUK, DKI JAKARTA

• Main Author: R, Erfandi
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/86767
• Institution: Institut Teknologi Bandung

Liquefaction analysis in reclamation areas has been intensively conducted because the main reclamation material is generally non-cohesive and susceptible to liquefaction. Indonesia, known as the “ring of fire”, has a high earthquake potential that can trigger liquefaction. Conus penetration test (CPT) is one of the methods used in collecting soil layer data, which is then used as data for the research area's liquefaction analysis and geological conditions. Liquefaction analysis in this study uses a comparison of 3 methods that are currently developing. Data analysis was carried out to produce the value of the liquefaction safety factor including the value of lateral displacement and subsidence, the condition of the land surface in the event of liquefaction, and the liquefaction potential index of the research area. The results of soil layer analysis in the study area resulted in 3 variations of sediment types: sand sediment type, silt sediment type, and clay sediment type. The comparison of the 3 methods used generally shows that the research area has high liquefaction potential in clean sand material at depths between 4.5 - 15 m from the surface. The largest lateral displacement values averaged at each CPTu point ranged from 97.46 - 339.02 cm and the largest land subsidence averaged at each CPTu point ranged from 4.41 - 23.39 cm. The ground surface conditions are estimated to have the potential for liquefaction and the liquefaction potential index (LPI) value shows that the study area has an average LPI of very high risk except at points CPTu-CH4950 and CPTu-CH5050 which have a high risk LPI value.