Effect of Coalbed Methane Well Fracturing on Slope Stability of Open-Pit Coal Mine: A Case Study of Shengli East No. 2 Open-Pit Coal Mine

Table 6

Requirements of slope stability coefficients.

Type of slope	Service years	Stability coefficient
Slope on which there are particularly important buildings or whose sliding may cause major loss of life or property	>20	>1.5
Final slope of the mining site	>20	1.3–1.5
Nonworking slope	<10	1.1-1.2
	10–20	1.2-1.3
	>20	1.3–1.5
Working slope	Temporary	1.05–1.2
Slope of external dump	>20	1.2–1.5
Slope of internal dump	<10	1.2
	≥10	1.3