Ground Response and Mining-Induced Stress in Longwall Panel of a Kilometer-Deep Coal Mine

Table 1

Rock properties from the experimental test.

Rock type	E (GPa)		Cohesion (MPa)	Friction (°)	Tensile strength (MPa)	Uniaxial compressive strength (MPa)
Coal	3.6	0.20	5.2	33	1.8	20
Mudstone	18.6	0.25	8	35	3.2	31
Siltstone	20.6	0.25	12	40	6.4	52
Sandstone	32.0	0.16	18	42	11.2	80