Penentuan Volume Potensi Longsoran Lereng Tambang Terbuka Menggunakan Metode Kesetimbangan Batas 3 Dimensi

Abstract

AbstrakSalah satu dampak dari suatu risiko longsoran lereng tambang terbuka adalah jatuhnya material longsor ke dalam tambang yang sedang melakukan operasi tambang yang berakibat dapat menimbulkan terjadinya fatalitas dan/atau cidera bagi pekerja, serta kerusakan properti perusahaan. Oleh sebab itu analisis kestabilan suatu lereng selain digunakan untuk menentukan nilai faktor keamanan (FK) dan probabilitas kelongsoran (PK) lereng, juga dapat memprediksi besaran volume longsoran bila terjadi kegagalan dalam disain lereng. Penelitian ini menggunakan metode kesetimbangan batas (limit equilibrium method) 3 dimensi dalam penentuan volume longsoran lereng dengan lokasi pada tambang terbuka batugamping di Rembang, Jawa Tengah. Ke depan diharapkan pendekatan ini dapat dimanfaatkan para praktisi untuk perencanaan mitigasi kelongsoran lereng. Kata Kunci : Tambang terbuka, stabilitas lereng, metode kesetimbangan batas 3 dimensi, dampak longsoran AbstractOne of the consequences from a risk of open pit failure is the fallen of the failure material in a mine that is doing the mine operation that can cause fatality and/or injury to workers, and damage to company properties. Therefore, the slope stability analysis is not only used to determine the safety factor (SF) and failure probability (FP), but it can also predict the amount of the volume of failure if there is any fault in the slope design. This research used 3D limit equilibrium method in determining the volume of potential failure of an open pit limestone mine in Rembang, Central Java. In the future, it is hoped that this approach can be utilized by practitioners for mitigation of slope failure planning. Keywords : Open pit, slope stability, 3D limit equilibrium method, consequence of failure PENDAHULUANResiko longsoran dapat dikuantifikasi dengan mengalikan probabilitas kelongsoran dan konsekuensi. Manajemen resiko perlu dilakukan untuk meyakinkan potensi

Application of cuckoo search method in 3D slope stability analysis for limestone quarry mine

“…Furthermore, there is a relationship between the failure probability and the volume of failure (Azizi et al, 2014). Another issue is that when 3D analysis is performed using a Grid Search, the use of 3D slope stability analysis on a vast area can be complicated (Azizi et al, 2018). This supports the statement of Hu et al (2015) that more advanced optimization methods are required in real cases.…”

“…Material in this location consists of 2 types of rocks, namely high-grade limestone and lowgrade limestone. The material properties for the high-grade limestone are unit weight 20.6 kN/m 3 , cohesion 170 kPa, internal friction angle 53.0 degrees and tensile strength 2500 kPa, whereas the low-grade limestone properties are unit weight 20.5 kN/m 3 , cohesion 120 kPa, internal friction angle 46.9 degrees and tensile strength 2250 kPa (included geotechnical model adopted from Azizi et al (2018). Slope stability analysis was performed in LEM 3D "Bishop" (Cheng and Yip, 2007) with Cuckoo Search (CS) of slip surface using simulation variable of max iteration and max columns in X or Y.…”

“…It has been explained in Gens, Hutchinson and Cavounidis (1988). The 2D analysis cannot be used as the main standard to assess the stability of open pit mine slope because it has not been considered as the spatial problem, thus a volume of potential failure of slope could not estimate in this approach (Azizi, Marwanza and Hartanti, 2018). The importance of estimation in a volume of slope failure is for risk calculation of slope failure.…”