KARAKTERISASI MASSA BATUAN DAN ANALISIS PROBABILITAS KERUNTUHAN PADA AREA PERTAMBANGAN BATUAN DI WILAYAH LAGADAR, KABUPATEN BANDUNG DAN BATUJAJAR, KABUPATEN BANDUNG BARAT, JAWA BARAT

• Main Author: Ramdhani Rachman, Fahmi
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/32373
• Institution: Institut Teknologi Bandung

Research area is located at coordinates 6° 53’ 56” S, 107° 30’ 10” E up to 6° 56’ 8” S, 107° 32’ 15” E which administratively covers Lagadar, Bandung Regency and Batujajar, West Bandung Regency, West Java. The research location is a rock mining area that is still being mined actively today. This research aims to characterize the rock mass, analyze rock failure probability, and optimize the slope excavation at the rock mining area. The conducted methods of this research are field observation, rock sampling, and scanline survey at 5 sites. The sites are F-5, F-10.1, F-10.2, F-11, and F-12. Quantitative method is conducted to characterize the rock mass, followed by analysis of rock failure probability with kinematic analysis method, and excavation optimization using kinematic analysis scenarios. Field observation obtained the rock type of site F-5, F-10.1, and F-10.2 are andesite; site F-11 is breccia; and site F-12 is dacite. Index test results the average range of Schmidt Hammer Rebound Value (SHRV) is 40,25–63,05. Physical property test results the value range of unit weight is 22,96 kN/m3–26,03 kN/m3 and porosity is 1,92%–3,78%. RMR rock mass characterization results the RMR total value of all sites are “good” category. Rock failure probability analysis on all sites results the major failure is wedge failure at 14,65%–38,97%. SMR analysis results the slope of all sites are “good” category. Optimization of dip angle excavation is 65°. The excavation optimum direction of each sites are N240°E for site F-5 , N250°E for site F-10.1, N80°E for site F-10.2, N10°E for site F-11, and N120°E for site F-12. Optimization of excavation type results all sites should use “blast to loosen” for the rock slope.