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 7

Field example data statistics.

Mining area	Shafts	Surface subsidence velocity (mm/a)	Cumulative surface subsidence (mm)	Loose strata thickness (m)	The water level drop value at the bottom of a loose aquifer (m)	Shaft wall thickness (m)	Construction method and shaft wall types	Inner-outer diameter ratio of the shaft	Shaft wall construction quality	Actual grade
Huaibei	Linhuan Coal Mine auxiliary shaft	47	426	239.1	41.6	0.77	0.7	0.73	9	5
	Haizi Coal Mine middle air shaft	60	503	245	70	0.77	0.3	0.63	3	5
	Haizi Coal Mine main shaft	60	503	247.2	72	0.6	0.3	0.72	7	5
	Haizi Coal Mine auxiliary shaft	60	503	239.1	70	0.71	0.3	0.72	5	5
	Zhuxianzhuang mine air shaft	10	100	254	7.3	1.33	0.5	0.75	1	1
Xuzhou	Zhangshuanglou mine main shaft	38	466	242.95	48	0.83	0.5	0.73	9	4
	Zhangshuanglou mine auxiliary shaft	38	466	243.15	55	1	0.7	0.73	9	4
Huainan	Pansan Coal Mine west wind shaft	35	273.06	440.82	35	1	0.3	0.806	3	3
	Panyi Coal Mine east wind shaft	36	300.55	292.46	42	1	0.3	0.673	9	4
Yanzhou	Xinlongzhuang Coal Mine main shaft	51	400	189.31	38.31	0.77	0.3	0.785	5	3
	Xinglongzhuang Coal Mine auxiliary shaft	51	400	190.41	42.69	0.83	0.5	0.78	7	4
	Xinglongzhuang Coal Mine east wind shaft	20	300	176.45	47.96	1.42	0.5	0.781	7	4
	Nantun Coal Mine baimahe air shaft	21.51	272.5	140.5	36.71	1.25	0.5	0.8	7	3
	Dongtan Coal Mine main shaft	14.94	305	305	10.43	0.91	0.1	0.75	3	2
	Dongtan Coal Mine auxiliary shaft	15.18	309.9	309.9	7.43	1.1	0.3	0.78	3	2