Study on the Process and Mechanism of Slope Failure Induced by Mining under Open Pit Slope: A Case Study from Yanqianshan Iron Mine, China

Table 2

The macromechanical parameters of the rock masses.

Rock formation	Location	Heterogeneity index (m)	Uniaxial compressive strength (MPa)	Young’s modulus (GPa)	Poisson’s ratio	Internal friction angle (°)	Density (g/cm^3)
Orebody	Middle	7	94.5	27.9	0.14	14.6	3.4
Mixed granite	South	7	57.0	6.7	0.2	33.8	2.7
Phyllite	North	7	28.2	5.3	0.21	32	2.6
Diorite	North	7	75.5	11.5	0.2	34.9	2.8