Method to Calculate Working Surface Abutment Pressure Based on Key Strata Theory

Table 3

Mechanical parameters of rock mass used in the numerical simulation.

	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesion (MPa)	Friction angle (°)	Tensile strength (MPa)	Normal stiffness of joint (GPa)	Shear stiffness of joint (GPa)
Loess	3.3	1.5	0.11	10	0	2.7	2.5
Fine sandstone	10.4	7.5	10.9	43.9	11.9	6.2	4.7
Coarse sandstone	8.8	6.0	9.8	42	8.9	5.4	3.8
Mudstone	6.0	3.6	5.1	38	4.7	3.2	2.9
Coarse sandstone gravel	15	8.6	12.4	43.5	13.8	9.5	6.4
Conglomerate	18	11.8	15.4	48	15.5	10.9	8
Medium sandstone	9.2	6.5	10.2	42.5	9.2	5.6	4.3
Sandy mudstone	7.4	4.5	6.2	39	6.6	4.5	3.2
Siltstone	8.5	5.2	9.4	41	8.0	5.2	3.5
Coal	3.5	2.1	3.6	37	1.8	2.5	1.6