MINING SLOPE STABILITY ANALYSIS USING ROCK MASS CLASSIFICATION AND KINEMATIC ANALYSIS ON PANCIR MOUNTAIN AREA, BANDUNG REGENCY AND PATROL MOUNTAIN AREA, WEST BANDUNG REGENCY, WEST JAVA

• Main Author: Alibasya, Muhammad
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/41924
• Institution: Institut Teknologi Bandung

Research area was located on mining site of Pancir Mountain area, Bandung Regency and Patrol Mountain Area, West Bandung Regency at coordinates 6°55'50.81"S, 107°30'28.04"E, to 6°57'32.42"S, 107°32'12.30"E. This research aims to characterize the rock mass, slope stability analysis and optimalization for the safest mining direction. The conducted methods of this research were field observation, rock sampling and scanline survey at 4 sites. The sites are L-1, L-2, L-3 and L-4. Empirical method is conducted to characterize the rock mass by RMR classification, followed by slope stability analysis using the probability of type of rock failure with kinematic method and SMR classification analysis. Based on the field observation, lithology of all sites are composed by andesite, while at L-4 by now being altered. Index property testing on all slopes showed the average of SHRV between 30–50. Physical property testing on all slopes showed the average of bulk density between 23.42 kN/????3–24.79 kN/????3. Based on those properties value, we found that rock strength of the all slope lies between 37–120 MPa. Rock Mass Rating (RMR) classification shows the rock mass category of class II (good rock) at L-1, L-2 and L-3 while class III (fair rock) at L-4. The kinematic analysis shows the pattern of wedge failure type at L-1, L- 2 and L-3 while direct toppling failure type at L-04. Slope Mass Rating (SMR) classification shows the slope category of class III (partially stable) at L-3 and class IV (poor/unstable) at L-1, L-2 and L-4. The adjustment of mining directions are consider necessary to reduce the disaster risk of engineering geology, especially with the unstable slopes. The most optimal slope dip directions were N190°E at L-1 and N230°E at L-2 with stable condition while N120°E at L-3 and N30°E at L-4 with partially stable condition. Evaluation conducted from optimization of mine direction using rock mass classification and kinematic analysis has shown that they are not suitable for rock mass with low RMR value.