Determining the Layout Parameters of the Gas Drainage Roadway: A Study for Sima Coalmine China

Table 3

Calculation results.

Key stratum	(°)	i	q (MPa)	(MPa)	(MPa)		k
First inferior key stratum	87.8	1.75	392.23	26.0	4.29	0.165
Second inferior key stratum	87.2	7.22	130.37	67.9	0.35	0.005	0.29
Main key stratum	87.0	4.19	386.47	106.2	1.34	0.013