Mechanical Properties of Sandstone Roof and Surrounding-Rock Control of Mining Roadways Subject to Reservoir Water Disturbance

Table 4

Major parameters of rock mechanics.

Lithology	Density (kg/m³)	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesive strength (MPa)	Internal friction angle (°)	Tensile strength (MPa)
Fine sandstone	2500	0.85	0.4	1.87	30	2.15
Mudstone	1780	0.65	0.3	1.82	28	2.15
Coal	2450	0.4	0.2	1.71	28	1.69
Medium sandstone	2750	1.85	0.85	1.88	33	2.04