Aquiclude Stability Evaluation and Significance Analysis of Influencing Factors of Close-Distance Coal Seams: A Case Study of the Yili No. 4 Coal Mine in Xinjiang, China

Table 9

Range analysis.

Scheme	Upper coal seam mining height (m)	Lower coal seam mining height (m)	Seam spacing (m)	Evaluation index
1	3	5	10	0.8033
2	3	9	20	0.7671
3	3	13	30	0.6758
4	6	5	20	0.7493
5	6	9	30	0.6237
6	6	13	10	0.2475
7	9	5	30	0.6475
8	9	9	10	0.1969
9	9	13	20	0.0074
	2.24625	2.20005	1.24773
	1.62047	1.58775	1.52385
	0.85188	0.93081	1.94702
	0.7488	0.7334	0.4159
	0.5402	0.5292	0.5080
	0.2840	0.3103	0.6490
Range	0.465	0.423	0.233