Optimization of Support and Relief Parameters for Deep-Buried Metal Mine Roadways

Table 3

Grading results.

Test location	E1	E2	E3
	29.45	33.66	20.51
	2	2	2
	1	1	2
	4	5	5
	1	1	1
	2	2	3
	0.69	0.63	0.09
Grade	IV	IV	V