KESTABILAN LERENG MENGGUNAKAN PROGRAM SLOPE/W PADA PIT GN-10 PULAU GAG KABUPATEN RAJA AMPAT PAPUA BARAT

Abstract

Slope stability is one very important factor in implementing a safe and productive mining as well as environmentally conception. The purpose of this research is to obtain a safe slope applied to the Pit GN-10 of Gag Island. This slope stability study uses computer program Slope/W by entering slope geometry and parameter data that has been obtained from the results of geotechnical drilling and laboratory testing of soil mechanics. This program computes safety factor values each slope that has been simulated on slopes 40°, 45°, 50°, 55° and 60°. The computed result shows that the slope of slopes 40°-50° have safety factors above 1.2 and the slope of slopes 55°-60° have safety factors below 1.2. The values of safety factor each slope that has been simulated, then comparing with the minimum standard value of safety factor that is considered stable. Based on the results of slope stability studies, the slope that can be applied to Pit GN-10 is a maximum 50° with safety factor value using the Bishop method 1.269. Keyword: