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 7

Strata division for slope stability calculation and physical and mechanical parameters for sliding slope stability calculation.

Designation of layer	Thickness (m)	Natural bulk density (kg/m^3)	Cohesion (MPa)	Friction angle (°)
Topsoil layer	100	2,000	0.13	18
Coalbed no. 4	10	1,500	1.32	27
Soft layer	10	1,800	0.13	18
Middle rock layer	220	2,300	2.0	21
6# coal seam	60	1,500	1.32	27
Bedrock layer	100	2,600	8.56	37