Experimental Investigation into the Bedding Plane Slip Effect on the Overlying Strata Behavior in Longwall Top Coal Caving of Soft Coal Seam

Table 3

Physical and mechanical properties of rock and coal samples.

Type	Uniaxial compressive strength σc (MPa)	Uniaxial tensile strength σt (MPa)	Elastic modulus E (GPa)	Cohesion C (MPa)	Internal friction angle ƒ (°)
Roof	22.39	2.03	1.60	1.51	28
11# coal seam	11.20	0.45	1.24	0.34	33
Floor	22.35	1.30	1.49	0.65	41