SLOPE STABILITY ANALYSIS OF PT XYZ’S COAL PIT ON PSEUDO-STATIC AND DYNAMIC CONDITIONS DUE TO BLAST LOAD BY FINITE ELEMENT METHOD

• Main Author: Christian, Ervin
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67291
• Institution: Institut Teknologi Bandung

Open-pit mining activities on coal commodities will certainly form slopes where these slopes with parameters of material strength, conditions of certain constituent materials, and other external factors have the potential to fail. In addition, blasting activities are often carried out in mining sequences to disperse rock mass or simply to increase productivity. In addition, blasting causes vibration and blast load which can affect slope stability. Therefore, it is necessary to analyze the slope stability under static condition (initial condition), as well as in pseudo-static and dynamic conditions due to blast load. The analysis in this study was carried out by numerical modeling using the Finite Element Method (FEM) with RS2 software, in more detail using the Shear Strength Reduction (SSR) and dynamic analysis methods. Based on the analysis of a hypothetical (simple) model, it is found that there is a very close and unidirectional relationship between blast load and total permanent displacement (correlation: 0.99), as well as in the relationship between total maximum displacement and total permanent displacement (correlation: 0.99). Based on the analysis of the actual (complex) model, the results of the Safety Factor in the static state are 2.03 (safe), the Safety Factor in the pseudo-static state is 1.02 (unsafe), the Safety Factor under dynamic conditions with a critical displacement determination of 26 mm is 1.2 (safe), and the maximum blast load provision that is allowed at critical displacement limit conditions and the Safety Factor of 1.1 is 300 kPa which is equivalent to the total explosive charge of 451.13 kg.