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

Table 3

Three factors and three levels’ design.

Factors	Levels
	−1	0	1
Mining height (M) (m)	1	3	5
Buried depth (D) (m)	300	500	700
Interlayer spacing (H) (m)	20	40	60