Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata

Table 1

Mechanical parameters of the engineering rock mass.

Group	Volume weight (kN/m^3)	Compressive strength (MPa)	Tensile strength (MPa)	Elastic modulus (GPa)	Poisson’s ratio	Cohesive strength (MPa)	Internal friction angle (°)
Diabase	28.47	102.74	8.72	20.24	0.32	32	57
Green schist	27.45	46.96	4.57	16.82	0.18	7.7	54
Coal	18.29	14.82	0.37	7.20	0.21	0.48	48