Deformation Characteristics and Control Mechanisms of Deep High-Stress Large-Span Roadways

Table 1

Numerical calculation parameters of severe deformation in a deep high-stress roadway.

Lithology	Block		Block/contact		Contact
	Elasticity modulus (GPa)	Cohesive force (MPa)	Internal friction angle (°)	Tensile strength (MPa)	Normal/tangential stiffness (GPa)
Mudstone	0.8	1.2/3.8	24/30	0.8/1.5	90/70
Sandstone	2.0	4/10	38/40	1.2/2.8	160/100
Coal seam	0.6	1.1/3.2	21/28	1.1/1.4	80/48