Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology

Table 2

Parameter of cohesion and friction angle as functions of plastic strain.

	(°)	c (MPa)
0	25.0	1.80
0.008	22.0	1.60
0.095	12.0	0.45
0.012	7.0	0.15