SLOPE STABILITY ANALYSIS OF PT XYZ COPPER OPEN PIT LOM IN MALUKU PROVINCE

• Main Author: FEDRIK NABABAN, YOSUA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57486
• Institution: Institut Teknologi Bandung

PT XYZ is a copper mining company in Maluku Province which plans to analyse its slope stability. According to Minister of Energy and Mineral Resources’ Decree No. 1827K/30/MEM/2018, analysis of probability of failure (PoF) is required in order to decide whether the slope is safe or not. This research’s purpose is to ascertain safety factor value, avalanche probability, and also a recommended safe slope’s geometry if found that the slope’s condition is not safe. PoF analysis is done by calculating the safety factor of the slope a thousand times. The material’s characteristic is appraised at random by Monte-Carlo Simulation Method on Slide 6.0 software which simultaneously used for the slope’s safety factor. The evocation at random is perceived based on the input parameter that consists of the material’s characteristic distribution along with average, standard deviation value, and also relative minimum and maximum value. This distribution is obtained from goodness of fit test tabulation along with Kolmogorov-Smirnov Test and Akaike Information Criterion Test. From the analysis result, it’s found that for slope on section A2 has static safety factor; dynamic safety factor, and static PK; dynamic PK consecutively by 1,7; 1,545 and 0,1%; 0,5% for Mohr-Coulomb Criteria, with 1,864; 1,693 and 0,0%; 0,1% for Hoek-Brown Criteria. Meanwhile slope on cross section B2 has static safety factor; dynamic safety factor, and static PK; dynamic PK consecutively by 1,484; 1,337 and 4,2%; 9,5% for Mohr- Coulomb Criteria, with 1,503; 1,363 and 2,4%; 4,3% for Hoek-Brown Criteria. On slope section B2 which located on an unsafe slope, a change of the slope’s geometry is required. The single slope’s angle is diminished from 52-60 degrees to 48 degrees. As a result, the entirety of the slope’s angle changed from 32 degrees to 29 degrees. The obtained results are the value of static safety factor by >1,3; dynamic safety factor > 1,1; and PK <5% which means the slope is in a safe condition.