THREE-DIMENSIONAL NUMERICAL ANALYSES ON EXCAVATIONS IN CENTRAL JAKARTA WITH CONSIDERATION OF TIME-DEPENDENT SOIL BEHAVIOR

• Main Author: Muhammad Dwiyanto Agung
• Other Authors: Fu-Chen Teng
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/wtv6rs

碩士 === 國立臺灣科技大學 === 營建工程系 === 107 === Jakarta is a rapidly developing city where many underground constructions are built recently, including Jakarta Mass Rapid Transit (MRT). Excavation cases in Central Jakarta namely Dukuh Atas and Bundaran HI station which is part of Jakarta MRT were analyzed in this study. Soft soil (SS) model was employed to both stations to observe the excavation characteristics. At Dukuh Atas station, a large increment of wall deformation after 1 month of completion of the slab at the final stage of excavation has been found which does not exhibit at Bundaran HI station. It is presumably due to the creep effect of the soil and dissipation of pore water pressure because of the presence of the sand lens. Three-dimensional (3D) numerical analysis with soft soil creep model (SSC) to analyze the time-dependent soil behavior is carried out in this study. SSC model is adequate to model the behavior of soft soils by considering the soil creep. Parameters of the SSC model was calibrated and interpreted based on both results from in situ and laboratory tests. In this study, wall deformation after completion of the slab is compared to wall deformation at 1 month after completion of the slab. The output from the SSC model will be compared to the soft soil model (SS) that represents no creep behavior. Moreover, a series of parametric was conducted to evaluate the best fit soil parameters and design details, such as PIP wall and opening on slabs.