Desain Geometri Lereng Disposal Yang Optimum Berdasarkan Karakteristik Geoteknik

Abstrak

Mining activities generally involve the removal of overburden to access economically valuable mineral resources. Therefore, in the Tapuemea Block, a designated area is required for the disposal of overburden material so that it does not cover zones that still contain economically mining materials. To support this plan, it is necessary to design a safe disposal area for handling overburden material by considering storage capacity and geotechnical stability. Since overburden fill material generally has low shear strength due to its loose nature, its stability is susceptible to disturbances and potential landslides. The purpose of this study is to analyze the physical and mechanical properties of the fill material and to determine the optimum geometry design for a safe disposal area. This study employs a slope stability analysis method using the limit equilibrium approach with the Mohr-Coulomb failure criterion. Based on the laboratory test results, the overburden material is classified as low-plasticity clay (CL), which is susceptible to circular slip failures. Direct shear tests showed that the soil has relatively low shear strength, indicating the need for a customized disposal slope design to maintain stability. The disposal in the Tapuemea Block is designed as a valley fill type with a height of 42 meters, constructed in four stages. The total designed disposal capacity reaches 518,000 LCM.

Kata kunci

• material lepas
• rancangan disposal
• stabilitas timbunan