Study on the Influence of In Situ Stress Distribution on the Stability of Roadway Surrounding Rock

Table 1

Physical and mechanical parameters of rock strata.

Rock parameter	Siltstone	Mudstone	Glutenite	Sandstone
Bulk modulus (GPa)	1.11	0.83	1.0	0.97
Shear modulus (GPa)	0.83	0.38	0.6	0.72
Cohesive forces (MPa)	6.0	3.0	4.0	5.0
Angle of internal friction (°)	38	32	34	38
Angle of dilatancy (°)	10	10	10	10
Tensile strength (MPa)	2.5	1.0	1.5	2.0