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

Table 2

Value of lithology proportion coefficient.

Scheme number	Lithology ratio			Lithology proportion coefficient
	Soft (%)	Medium (%)	Hard (%)
1 (soft)	80	10	10	2.05
2 (medium)	10	80	10	3.94
3 (hard)	10	10	80	6.11