Numerical Simulation of the Supporting Effect of Anchor Rods on Layered and Nonlayered Roof Rocks

Table 2

Interface unit parameters.

Weak plane	Normal stiffness (GPa·m^−1)	Tangential stiffness (GPa·m^−1)	Tensile strength (kPa)	Friction angle (°)	Dilatancy angle (°)
1#	13	12	50	30	2
2#	12	11	120	28	2
3#	11	10	150	28	2
4#	10	9	100	25	2