Deviatoric Stress Evolution Laws and Control in Surrounding Rock of Soft Coal and Soft Roof Roadway under Intense Mining Conditions

Table 1

Parameters of cohesion and friction angle between coal and mudstone as a function of plastic strain.

	ε	C (MPa)	φ (°)
Coal	0	1	20.0
	0.0066	0.91	19.1
	0.0071	0.28	13.0
	0.0075	0.14	4.0
Mudstone	0	1.1	23
	0.0079	0.97	20.2
	0.0086	0.37	16
	0.0092	0.23	6