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 8

Index value of each factor influencing shaft stability.

Evaluation index	Indicated value
Surface subsidence velocity(mm/a)	1
Cumulative surface subsidence (mm)	1
Loose strata thickness (m)	1
The water level drop value at the bottom of a loose aquifer (m)	1
Shaft wall thickness (m)	0
Construction method and shaft wall types	1
Inner-outer diameter ratio of the shaft	1
Shaft wall construction quality	1