ANALYSIS OF SIDEWALL SLOPE STABILITY USING THE BISHOP METHOD AT PT BATU HITAM JAYA, JAMBI PROVINCE
Abstract
A slope failure occurred at the lowest bench of the open-pit coal mine operated by PT Batu Hitam Jaya in Jambi, Indonesia, in early February 2025. The failure, measuring 16 meters wide, 5 meters high, and sloped at 38°, critically impacted an access road to the disposal area, disrupting operations and escalating safety risks. This failure disrupted mining operations and increased safety risks, highlighting the need for slope stability analysis to evaluate the safety of the existing slope design and to prevent recurrent failures. This study aims to identify the geotechnical parameters of the sidewall material, analyze the stability of the existing slope, and propose a safer slope redesign. Slope stability analysis was conducted using Rocscience Slide software based on the Mohr–Coulomb failure criterion and the Bishop Simplified method, which was selected due to its effectiveness in evaluating slopes with circular potential failure surfaces in open-pit mining conditions. The critical failure surface was determined using the Grid Search method. Initial analysis revealed Factor of Safety (FoS) values of 0.927 and 0.942, confirming the slope's unstable condition. Following a geometry redesign, the FoS values successfully increased to 1.302 and 1.244. These enhanced values classify the slope as significantly more stable and safe, ensuring reliable support for ongoing mining operations.
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