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

Table 1

Rock mechanics parameters table.

Rock name	Uniaxial compressive strength (MPa)	Elastic modulus (GPa)	Tensile strength (MPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)
Sandy clay layer	45.68	24.32	4.65	0.26	18.63	32.12
Medium to coarse crystalline dolomite	48.25	35.43	6.38	0.15	14.69	34.22
Layered argillaceous dolomite	74.12	32.54	7.87	0.17	18.60	44.36
Pebbly quartz sandstone	78.41	49.12	6.61	0.25	22.53	49.75
Phosphate rock	87.49	45.36	12.73	0.32	28.70	54.78
Light gray primary dolomite	63.71	46.72	11.59	0.19	18.42	53.17
Dark gray native dolomite	88.62	52.49	14.37	0.10	25.94	44.25