Analysis of Failure Mechanism of Roadway Surrounding Rock under Thick Coal Seam Strong Mining Disturbance

Table 2

Joint mechanical parameters of rock mass.

Joint property	Sand mudstone	6# coal seam	Mudstone	Fine sandstone	Silestone
Normal stiffness (GPa/m)	134.2	86.5	102.4	276.4	186.1
Shear stiffness (GPa/m)	53.7	34.5	40.8	110.5	72.6
Cohesion (MPa)	1.1	0.5	1.0	1.3	0.9
Tension (MPa)	2.6	0.9	1.7	4.2	2.1
Friction angle (°)	29	25	28	31	32