ANALYSIS OF CRITICAL ACCELERATION ON BLASTING VIBRATION AT PT XYZ SLOPE STABILITY USING FINITE ELEMENT METHOD AND ANALYTICAL METHOD

• Main Author: Winarti, Sri
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40365
• Institution: Institut Teknologi Bandung

PT XYZ is a coal company, in which operations use blasting to peel the overburden to make it easier to take. The negative effect of blasting that can occur is one of them is ground vibration. If the ground vibration exceeds the threshold value it can cause the land to landslide, so an analysis of slope stability and a maximum horizontal vibration threshold value (a critical) is needed so it is not cause landslides that can disrupt mining operations. In this final project, research will be carried out in Highwall and In pit dumps. Slope stability analysis was carried out using the finite element method using the help of Rocscience Phase2 8.0 software. Then for critical acceleration modeling will be done using Phase2 8.0. and the analytical methods in the Newmark equation (1965) where the acceleration will be gradually increased until the slope becomes unstable. The value of static safety factor for the overall slope is 1.3 and the value of the dynamic safety factor is 1.1 with a high level of landslide severity. The results showed that the slopes were safe (stable) and the critical acceleration for each slope varied depending on the height and dip of the slope. For the value of critical acceleration based on the Newmark equation obtained a greater value compared to the results of modeling using Phase2. The relationship between critical acceleration to dynamic safety factor is inversely proportional where large critical acceleration will result in a small dynamic safety factor.