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

Table 2

Similar material ratio scheme.

Lithology	Simulated thickness (cm)	Actual strength (kPa)	Simulation strength (kPa)	Material ratio (sand : lime : gypsum)
Sandy clay layer	10	2.19	4.38	6 : 7 : 3
Medium to coarse crystalline dolomite	69.7	35.16	70.32	2.5 : 1.4 : 8.8
Layered argillaceous dolomite	23.5	24.78	49.56	2.8 : 3.5 : 6.5
Pebbly quartz sandstone	8	22.87	45.74	3 : 1 : 9
Phosphate rock	4.3	38.54	71.68	2.4 : 1.2 : 9
Light gray primary dolomite	2.3	39.35	78.7	2.4 : 1 : 9
Dark gray native dolomite	50.0	34.17	68.34	2.45 : 1.5 : 8.5