LIQUEFACTION POTENTIAL ANALYSIS BASED ON DETERMINISTIC SEISMIC HAZARD ANALYSIS AND N-SPT ON JOGJA - SOLO TOLL ROAD

• Main Author: Tiffany Pangaribuan, Myra
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/79347
• Institution: Institut Teknologi Bandung

efaction. Liquefaction is a phenomenon when the soil loses its bearing capacity and strength due to cyclic loading such as earthquake. The impact of liquefaction can result in significant losses and damage to infrastructure. Therefore, it is necessary to conduct a liquefaction potential analysis for the Jogja – Solo Toll Road project. Section 1.2 of the Jogja – Solo Toll Road is selected as the research area for analyzing earthquake hazards and liquefaction potential. Based on the stratigraphy, the study area is situated within the Merapi Volcano Rock Formation, which serves as the surface deposit dating back to the Quaternary period. The Quaternary deposits consist of loose materials such as sand, tuffaceous sand, silty sand, and clayey silt, which are prone to liquefaction potential. This research was conducted using the deterministic seismic hazard analysis (DSHA) from a particular seismic source, North Opak Fault 1, as well as the potential liquefaction calculated using the Idriss and Boulanger (2014) method for Standard Penetration Test (N-SPT) on twenty seven boreholes. The DSHA results show that the peak ground acceleration (PGA) of the study area ranges from 0.3 to 0.5 g, indicating a moderate intensity. Additionally, a low liquefaction potential of 37% was obtained and derived from observations of 10 out of 27 boreholes that showed a safety factor below 1 and a percentage of fine grain below 35%. Among the ten boreholes, only one borehole is high in liquefaction potential, while the remaining nine boreholes are low in liquefaction potential.