Evaluation on the Stability of Vertical Mine Shafts below Thick Loose Strata Based on the Comprehensive Weight Method and a Fuzzy Matter-Element Analysis Model

Table 9

Calculated results of various influencing factors.

Evaluation index	Entropy value	Entropy weight	Ranking
Surface subsidence velocity (mm/a)	0.9111	0.1687	2
Cumulative surface subsidence (mm)	0.9569	0.0818	8
Loose strata thickness (m)	0.9256	0.1411	3
The water level drop value at the bottom of a loose aquifer (m)	0.9099	0.1709	1
Shaft wall thickness (m)	0.9397	0.1144	5
Construction method and shaft wall types	0.9407	0.1125	6
Inner-outer diameter ratio of the shaft	0.9569	0.0818	7
Shaft wall construction quality	0.9321	0.1288	4