Roadway Support in Deep “Three-Soft” Coal Seam: A Case Study in Yili Mining Area, China

Table 4

Peak stress of surrounding rock under different supporting conditions.

Support conditions	Stress (MPa)
	XX-stress	ZZ-stress	Max shear stress
Unsupported	71.71	31.41	24.99
Primary support	68.81	30.56	25.27
Secondary support	68.27	31.13	26.90