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

Table 3

Gob material properties.

Property	Density	Bulk modulus	Shear modulus	Cohesion	Friction	Tensile strength	a	b	c
	(kg/m^3)	(GPa)	(GPa)	(MPa)	(°)	(MPa)	(MPa)	—	(MPa)
Value	2000	1.2	0.6	0	30	0	60	15	20