Numerical Simulation of the Volumetric Strain Distribution of a Protected Coal Seam

Table 1

Basic parameters of the coal seams.

Parameter	Protective coal seam	Protected coal seam
Thickness of the coal seam	0.51 m (in average)	2 m (in average)
Tilt angle of the coal seam	7° (in average)	7° (in average)
Original gas pressure	—	0.82 MPa
Original gas content	3.37 m^3/t	10.4 m^3/t