Deformation and Failure Mechanism of Surrounding Rock in Mining-Influenced Roadway and the Control Technology

Table 1

Physical and mechanical parameters of each rock stratum.

Rock	Density (kg·m^−3)	Bulk modulus (GPa)	Shear modulus (GPa)	Internal cohesion (MPa)	Internal friction angle (°)	Tensile strength (MPa)
Fine sandstone	2500	8.55	5.42	6.5	37	2.7
Sandy mud stone	2300	5.68	3.73	4.2	35	1.2
Coal	1317	2.85	2.13	2.5	33	0.56
Sandy mud stone	2300	5.68	3.73	4.2	35	1.2
Fine sandstone	2500	8.55	5.42	6.5	37	2.7