SLOPE STABILITY ANALISYS OF JOINTED ROCK DUE TO BLASTING OF THE 4TH TUNNEL OF JAKARTA-BANDUNG HIGH SPEED RAILWAY PROJECT

• Main Author: Aditya, Fariz
• Format: Theses
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/51586
• Institution: Institut Teknologi Bandung

Slope stability analysis is influenced by factors including slope geometry, rock physical and mechanical properties, rock mass characterization, ground water level, existing rock structures and seismic load values. There is an andesite quarry mine in Sukatani subdistrict in Purwakarta Regency. Quarry mine’s area is close to the construction of the 4th tunnel of Jakarta-Bandung high speed railway project. The tunnel excavation which uses drilling and blasting methods, may causing an endanger conditions to the quarry slope doe to the vibration effect . The purpose of this research is to analyze slope stability of quarry which is influenced by slope joint and the vibration effect of 4th tunnel blasting. Analysis of slope stability is calculated by applying finite element methods using RS2 software. The comparison of safety factor (FK) value between homogenous rock slopes and rock-joint contained slopes is conducted, therefore, the effect of joints on the rock slope when vibration occurs is understood. The vibration load is modelled by applying PPA value recorded by blastmet placed close to the rock slope during blasting at the tunnel conducted. The PPA value is also used for predicting PPA value and determining the explosive charge when the tunnel-blast is conducted below the rock slope. The result of the research shown than the presence of a joint on the slope when the vibration occurred decreased the FK value of the slope by 15% on dry slope and 42% on saturated slopes. Based on FK value, the maximum recommended amount of explosive charge at a distance of 25 m below the rock slope is 30 kg/time-delay on dry slope and 20 kg/time-delay on saturated slope