Refky Adi Nata, Gaofeng Ren
CV. Bara Mitra Kencana is one of the coal mining company in Sawalunto, Indonesia. The mining activities' pattern of excavation yields natural and artificial slopes. Following observations in BMK-35 mining, it was regularly discovered that there were tiny failures and hanging rocks due to the abundance of rock discontinuity and excessively steep slopes of more than 80°. This study aims to analyze the strength of rocks by testing the Block Punch Index, analyzing the mass class of rocks with the SMR method, and knowing the safety factors using Software Slide Version 6.0. The test results obtained an average compressive strength for Sandstone of 0.3 MPa and 0.4 MPa for siltstone. While the UCS value from BPI is approximately 1.8 MPa for sandstone and 2.2 for siltstone. The acquired UCS measure is in use to determine the rock class. It is observed that the rock condition of the research object is poor category, the type of avalanche occur was the wedge failure. Pit slope safety factor BMK-35 was obtained by of 4.9. © 2024 American Institute of Physics Inc.. All rights reserved.
Mining Engineering Department, Wuhan University of Technology, Hubei Province, China; Faculty Department of Mining Engineering, Universitas Negeri Padang, Padang, Indonesia; Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Hubei Province, China
