No 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

No abstract

The Cuckoo Search (CS) is a very fast and efficient global optimization method to locating the slip surface which carried out by iteration. However, the Grid Search (conventional method) method in 3D slope stability analysis takes longer than this method on the computation process. Slope stability analysis was performed using the 3D limit equilibrium method “Bishop” with Cuckoo Search of slip surface by maximizing iteration of the simulation and columns in X or Y. To ensure that the slip surface within the global minimum slip surface, the maximum iteration in CS was also specified from 40 to 1200. Based on maximum columns in X or Y, the safety factor value of the 3D CS results was then compared to the Grid Search results to determine the final 3D safety factor and the estimated volume of potential failure. The final 3D safety factor obtained from the average 3D safety factor (with maximum iteration 400, 800, 1000, and 1200) is about 2,01 with the average estimated volume of slope failure of 190.000 m3 that located at the north of the pit.