The Stability Factors’ Sensitivity Analysis of Key Rock B and Its Engineering Application of Gob-Side Entry Driving in Fully-Mechanized Caving Faces

Table 3

Physical mechanical parameters of the rock mass.

Lithology	Bulk modulus (GPa)	Shear modulus (GPa)	Internal friction angle (°)	Cohesion (MPa)	Thickness (m)
Coarse-grained sandstone	11	9	36	4.0	7
Sandy mudstone	16	12	32	3.5	20
Siltstone	20	16	33	6.0	10
Siltstone	20	16	33	6.0	6
No. 5^−1 coal seam	8	6	28	1.5	3
Mudstone	6	5	28	4.0	2
Sandy mudstone	16	12	32	3.5	2
No. 5^−2 coal seam	8	6	28	1.5	2
Mudstone	6	5	28	4.0	3
Sandy mudstone	16	12	32	3.5	3
Siltstone	20	16	33	6.0	3
Sandy mudstone	16	12	32	3.5	8
Siltstone	20	16	33	6.0	4
No. 7 coal seam	8	6	28	1.5	2
Mudstone	6	5	28	4.0	2
Sandy mudstone	16	12	32	3.5	1.5
No. 8 coal seam	8	6	28	1.5	7
Sandstone	12	10	38	7.0	28.5