Research on the Evolution Characteristics of Rock Mass Response from Open-Pit to Underground Mining

Table 3

Rock mechanics parameters.

Rock name	Compressive strength (MPa)	Elastic modulus (GPa)	Tensile strength (MPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)
Sandy clay layer	2.19	9.96	1.25	0.15	1.51	19.0
Medium to coarse crystalline dolomite	35.16	35.43	1.25	0.28	3.86	29.85
Layered argillaceous dolomite	24.78	25.84	0.92	0.25	4.08	29.66
Pebbly quartz sandstone	22.87	17.52	0.67	0.26	5.25	29.52
Phosphate rock	37.96	28.40	0.88	0.3	5.64	30.53
Light gray primary dolomite	39.35	30.19	1.66	0.21	6.05	30.17
Dark gray native dolomite	34.17	26.80	0.72	0.23	5.42	30.32