Influencing Factors’ Analysis of Disturbance Degree of Key Stratum Based on the Response Surface Method

Table 6

Statistics of KSDD in each mine.

Number	Name of mine	Mining height M (m)	Buried depth D (m)	Interlayer spacing H (m)	Intermediate stratum		Disturbance degree of key stratum
					Lithology	Percentage (%)
1	Longde	3.96	120	80	Sandstone	65.97	2.823
					Mudstone	34.03
2	Yuhua	6.87	600	20	Siltstone	33.00	2.566
					Mudstone	2.50
					Fine sandstone	67.50
3	Da’anshan	2.23	500	10	Siltstone	65.00	6.64
					Mudstone	35.00
4	Fangezhuang	3.16	500	15	Siltstone	35.00	4.512
					Fine sandstone	65.00
5	Qianjiaying	2.3	500	14	Carbonaceous mudstone	19.70	3.138
					Siltstone	80.30