ANALYSIS OF SUBGRADE STRUCTURE SETTLEMENT ON THE JAKARTA BANDUNG HIGH-SPEED RAILWAY PROJECT

Abstract

The construction of the Jakarta-Bandung high-speed railway in Indonesia faces significant challenges due to high settlement rates. Geodetic studies conducted by the Bandung Institute of Technology (ITB) reveal that Bandung experiences some of the fastest and most extensive land subsidence globally, with rates varying from 8 to 23 cm per year across the region. These substantial subsidence rates critically affect the stability of subgrade structures along the railway route, necessitating a comprehensive analysis of foundation performance to predict settlement during construction and operational phases. This study employs PLAXIS software to simulate settlement under three foundation scenarios: CFG pile foundation, spun pile foundation, and without foundation. Settlement results are also compared against abutment construction using a bored pile foundation. The analysis indicates that the spun pile foundation achieves the lowest settlement rate and total settlement. These findings provide a valuable reference for mitigating structural subsidence and optimizing foundation design in high-subsidence areas.