Research on the Theory and Numerical Simulation of Mine Pressure Behavior in Steeply Inclined Thick Coal Seams

Table 1

Physical and mechanical parameters in the simulation process.

Rock stratum	Elastic modulus (GPa)	Cohesion (MPa)	Internal friction angle (°)	Tensile strength (MPa)
Old roof	48.6	5.7	36	4.2
Direct roof	52.1	2.2	32	4.0
Coal	2.9	2.0	30	0.35
Direct bottom	47.8	5.6	35	4.1