Simulation Study of the Roof Fracture Pattern of a Horizontal Sublevel Caving in a Steeply Inclined Thick Coal Seam

Table 3

Physical and mechanical parameters of coal and rock mass.

Rock	Body force γ (kN/m^3)	Elasticity modulus E (GPa)	Poisson’s ratio v	Tensile strength (MPa)	Cohesion (MPa)	Friction angle (°)
Main roof	28.7	33.4	0.235	1.29	3.2	42
Immediate roof	24.8	17.7	0.204	0.58	1.2	33
Coal	13.3	5.3	0.32	0.15	1.25	32
Immediate floor	24.8	17.7	0.204	0.58	1.2	33
Main floor	24.6	19.5	0.2	1.84	2.75	38