Effect of Advancing Direction of Working Face on Mining Stress Distribution in Deep Coal Mine

Table 1

Rock parameters.

Lithology	Elastic modulus (GPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)	Tensile strength (MPa)	Softening parameter
						m	n	k
Fine sandstone	21.22	0.16	10.0	38	1.29	0.001	0.70	750
Sandy mudstone	17.50	0.25	4.9	33	2.01	0.0015	0.65	400
Mudstone	14.69	0.25	2.4	32	0.58	0.002	0.56	320
Coal	2.83	0.20	1.25	30	0.15	0.0035	0.40	270