Persentase Tereduksi Penggunaan Sequential Blasting terhadap Ground Vibration pada Kegiatan Peledakan di Pit. Pinang A9, PT. Bukit Baiduri Energi, Provinsi Kalimantan Timur

Abstract

Blasting activity is a rock breaking activity that helps facilitate dismantling in excavation activities. At PT. BBE still carries out blasting activities to date in helping to break up the rocks in the mining location, especially at the PIT location. Pinang A9. Blasting activities themselves have quite dangerous impacts on the surrounding environment, one of which is ground vibration which can have quite serious impacts if the vibration value is high enough. In an effort to carry out this activity, a fairly high vibration value was still found in the theoretical calculation with an average PPV value of 1.68 mm / s. The rock conditions that dominate the blasting activity location are claystone and sandstone rocks where the compressive strength value is quite weak, which is in the soft category with a value of 8 to 16 Mpa. So in the process of this activity, a solution is needed to dampen the existing vibrations, in this case PT. BBE chose to use the Sequential Blasting technique solution where in its application Dummy Holes are given as an additional delay to make many blast holes into small groups when exploding. After the blasting activity was carried out, the PPV value was found to be reduced quite drastically with an average value of 0.46 mm/s, where in this case the Sequential Blasting technique can reduce the magnitude of vibration by up to 69.55%.Keywords: Blasting Geometry, Powder Factor, Optimum Cost, Cost Saving