Comprehensive Evaluation and Decision for Goaf Based on Fuzzy Theory in Underground Metal Mine

Table 2

Stability evaluation of upper goaf and lower goaf.

Index	Goaf
	Upper	Lower
U11	4.3 MPa	5.2 MPa
U12	0.20	0.28
U13	General	General
U14	32 m	26 m
U15	36 m	175 m
U16	75 m	75 m
U17	General	General
U18	Serious breaking	Pillars standard
U19	45 L•min^−1	32 L•min^−1
U110	General	General
U111	Weak	Great
U112	Small	Small
B	[0.07 0.21 0.35 0.37]	[0.08 0.47 0.15 0.31]
Ranks	IV, III	II