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PT Trubaindo Coal Mining (PT TCM) is a coal mining company located in West Kutai, East Kalimantan. Demolition of overburden layer is done by drilling and blasting can effect results primarily blasting ground vibration for highwall slope stability. Controlled blasting activities undertaken in 3000 Pit Block 05 using linedrill. Vibration measurement data obtained from the reading apparatus is not necessarily a factor affecting vibration highwall slope stability, but with the direction of propagation horizontal vibrations that cause the decrease highwall slope stability. The maximum horizontal acceleration arising from blasting activities as parameters that play a role in the stability of the slope obtained by linking the PPA with the equation Amax = 0.5167 x PPA. Therefore, to determine the effect of ground vibration due to blasting for highwall slope stability modeling needs to be done cross-section A-A ', BB', C-C ', D-D' and E-E '. Results of prediction equations safety factor value of each cross-section as follows:  Section of A-A’, FK = 5,1489 amax 6 – 32,719 amax 5 + 79,933 amax 4 – 93,928 amax 3 + 54,189 amax 2 – 13,898 amax + 1,30852  Section of B-B’, FK = 0,4838 amax 6 – 3,0058 amax 5 + 7,0149 amax 4 – 7,6767 amax 3 + 4,4953 amax 2 – 2,4997 amax + 1,44549  Section of C-C’, FK = 1,2021 amax 6 – 7,4203 amax 5 + 16,907 amax 4 – 17,239 amax 3 + 8,0429 amax 2 – 2,8212 amax + 1,3628  Section of D-D’, FK = 5,279a amax 6 – 33,941 amax 5 + 84,105 amax 4 – 100,68 amax 3 + 59,648 amax 2 – 15,946 amax + 1,57907  Section of E-E’, FK = -1,9442 amax 6 + 11,453 amax 5 – 24,289 amax 4 + 20,677 amax 3 – 2,7313 amax 2 – 4,8741 amax + 1,65573 The calculation results of critical maximum horizontal acceleration for every cross-section varies as the follows:  Section of A-A’, amax-critical = 0,007 g  Section of B-B’, amax-critical = 0,118 g  Section of C-C’, amax-critical = 0,062 g  Section of D-D’, amax-critical = 0,025 g  Section of E-E’, amax-critical = 0,09 g Variation is influenced by the thickness of the layer of top soil (top soil) and any cross-sectional geometry highwall slope.

promine/promine

The Wave Effect Analysis Caused By Blasting Toward Highwall Slope Stability At Coal Mining, Pit 3000 Block 05 Sb 1, PT Trubaindo Coal Mining, Kutai Western District, East Kalimantan Province