Ground Vibration Analysis to Reduce Blasting Damage in Open Mines

Analisis Getaran Tanah untuk Mengurangi Kerusakan Akibat Peledakan pada Tambang Terbuka

Abstract

Blasting is one of the mining activities that aims to scatter or release the rock from its parent. In general, explosions are some hazards, one of which is ground vibration. Vibration measurements must be made each time a blast is carried out. This paper aims to determine the factors that affect ground vibrations and find out how to reduce ground vibrations caused by explosions. This research was conducted at a coal mine at PT. Bukit Asam at the Tanjung Enim TSBC Pit, South Sumatra. Data were obtained by taking field and secondary data. Determination of PPV and powder factor values according to SNI 7571:2010. The recommendation for a perforated explosive charge to reduce the PPV distance value to below 3 mm/s is a distance of 900, a maximum load of 34 kg produces a PPV of 2.98 mm/s, a distance of 950, a maximum load of 36 kg produces a PPV of 2.83 mm/s, a maximum of 1000 a load of 40 kg produces a PPV of 2.84 mm/s, a distance of 1050 and a maximum load of 44 kg produces a PPV of 2.83 mm/s. The relationship between the value of the scaled distance and the actual PPV in the field with power regression, the value of K = 28942506 and m = -3.187. Then to get the PPV value <3 mm/s with a measurement distance of 1000 meters from the employee housing location, stuffing is needed. Blast hole 39 – 42 kg with a powder factor value of 0.116 – 0.124 kg/BCM. Through this actual explosive charge, it can still diffuse well.