Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Table 1

Rock mechanical parameters.

Number	Strata	Density (kg/m^3)	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesion (MPa)	Friction angle (°)	Tensile strength (MPa)
1	#2 coal seam	1467	0.44	0.36	2.1	24	1.92
2	Silty mudstone	2566	1.36	0.42	5.41	32.9	1.62
3	Mudstone	2550	1.28	0.36	5.1	28	1.22
4	Arkose	2630	4.92	2.4	13.5	30.2	4.31