COMPARISON STUDY OF SAFETY FACTOR AND STRENGTH FACTOR IN NUMERICAL MODELING FOR TUNNEL STABILITY ANALYSIS BASED ON MOHR-COULOMB CRITERIA

• Main Author: Rheza Prakusya, Farrel
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85088
• Institution: Institut Teknologi Bandung

One of the functions of a tunnel is to serve as the main access in underground mining activities, and the creation of an opening in the rock mass changes the local stress conditions. Therefore, it is necessary to calculate the magnitude and direction of stress after the opening to ensure the stability of the tunnel. This research examines the difference between the SF and the FoS in the rock mass surrounding the tunnel with varying ?h/?v (K) ratios. This study is important to determine whether the SF can be used as FoS. The analysis conducted revealed that the SF value approaches the FoS value for each K ratio, except for K=1. This is because the general stress values (?1 and ?3) principal stress at points far from the center of the tunnel will approach the in situ stress values, resulting in a larger ratio used in the SF calculation.