COMPARATIVE STUDY OF STABILITY IN SHALLOW COVER DEPTH AND DEEPER COVER DEPTH TUNNELS USING 2D NUMERICAL MODELING

• Main Author: Maulana, Andri
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85521
• Institution: Institut Teknologi Bandung

This study aims to compare the stability of tunnel structures at shallow cover depths and deeper cover depths by analysing the structural behaviours of tunnels using 2D finite element numerical methods. The data used is secondary data from the Samarinda Tunnel Construction Project. Modelling was carried out using the RS2 software, applying the Mohr-Coulomb failure criterion, with the assumption that the material is in a plastic and hydrostatic state. The study results show that the tunnel at a deeper cover depth (BH-05) experiences greater vertical and horizontal displacements compared to the tunnel at a shallow cover depth (BH-07). The arching zone formed in BH-05 is also larger, reaching a height of 2,5 m measured from the tunnel crown. The conclusion drawn is that the tunnel at a deeper cover depth has a lower stability potential compared to the tunnel at a shallow cover depth, especially in moderately weathered claystone.