Research on Effects of Blast Casting Vibration and Vibration Absorption of Presplitting Blasting in Open Cast Mine

Table 1

Basic information of the minable coal seam.

Coal measure era	Coal seam type		Thickness of coal seam; Min~max; Average/m	Coal seam spacing; Min~max; Average/m	Coal seam structure	Stability
Taiyuan formation	6	6I			Complex	Unstable
		6II		,	Complex
		6III~VI			Complex	Relatively stable