Failure Mechanism and Stability Control of Surrounding Rock of Docking Roadway under Multiple Dynamic Pressures in Extrathick Coal Seam

Table 1

Rock mechanics parameters of the computation model.

Lithology	Bulk modulus (GPa)	Shear modulus of elasticity (GPa)	Density (kg/m^-3)	Cohesion (MPa)	The angle of internal friction (°)	Tensile strength (MPa)
Fine-grained sandstone	5.4	3.1	3270	9.0	34	2.67
Sand shale	2.5	2.0	3180	3.5	28	1.51
Coal shale	2.5	2.5	3180	4.6	32	1.80
Coal	2.2	1.5	2800	2.5	26	1.22
Marl	4.3	2.0	3270	4.0	30	1.40
Siltstone	4.5	3.2	3570	12.0	32	2.32