Experimental and Numerical Analysis on the Damage and Failure Characteristics of Bituminous Coal under Multilevel Cyclic Loads

Table 1

Calculation parameters for numerical simulation.

Group	Normal stiffness (N/m)	Tangential stiffness (N/m)	Normal strength (Pa)	Tangential strength (Pa)	Friction coefficient	Content (%)
Group1	2E + 10	2E + 10	3E + 7	3E + 7	0.2	1.44
Group2	3.2E + 9	3.2E + 9	0.78E + 6	0.78E + 6	0.38	98.56