BLASTING DESIGN OF NANJUNG WATER TUNNEL USING SWEDISH METHOD

• Main Author: Fatah, Jordi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40319
• Institution: Institut Teknologi Bandung

the capacity of Citarum river from 570 m3/s to 643 m3/s and will accelerate the river flow at Curug Jompong to Nanjung. Tunnel construction is using conventional excavation method with excavator on weak rock mass and using drill-blast method on hard rock mass. Blasting design of Nanjung water tunnel use Swedish Method. Blasting design needs to pay attention to the level of vibration that will be produced. This is because the location of the tunnel construction is very close to PT. Gistex’s factory. Therefore, blasting design have to pay attention to the level of vibration that is safe according to SNI 7571:2010 in order not to endanger the activities in the factory. The maximum vibration that is safe for the closest building to the blasting location is 3 mm/sec. Blasting design is recommended with top heading and benching method using 84 explosive holes with a powder factor value of 1,45 kg/m3. Blasting design also use the full face method because in the previous method the blasting vibration was smaller than 3 mm/sec. The use of full face method was also intended to make the tunnel construction faster. Blasting design with full face method consist of 120 explosive holes with a powder factor value of 1,32 kg/m3.