Abstract
PT Kuansing Inti Makmur is a national private company engaged in the coal mining
industry using the blasting method. Ground vibration is one of the negative impacts of blasting on
the environment and surrounding buildings if it exceeds the predetermined standard. This mining
location is close to Tanjung Belit Village which is currently 500 meters from the settlement
according to the direction of mining progress. The threshold value for ground vibration is 0.9
mm/s based on the standards of PT Kuansing Inti Makmur. Ground vibration measurement data
were analyzed using scaled distance theory to obtain the effect of explosive charge and distance on
PPV which was divided into two based on the row direction (Row B – T and Row S – U) in order
to get more referentative results. In the direction of row B – T using the power regression equation,
based on the calculation results obtained by the equation PPV=4844,8 x
-1,648
. Meanwhile, for the
direction of row S – U using the average calculation using Microsoft Excel, the equation PPV =
3669,05 x
-1.6
is obtained. The vibration safety method uses a longer delay in the middle of the
segment. Based on the scaled distance theory, predictions of explosive charge are obtained to
achieve the specified vibration standard, namely for row B – T 55,5 kg ANFO at a distance of
1600 meters and row S – U 78,6 kg ANFO at a distance of 1600 meters. By using the blasting
method with a longer delay in the middle of the segment, it is more effective to reduce vibration
accumulation and predict vibrations with good material quality results.