Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

Table 1

Mechanical parameters of rock mass and the backfill.

Rock layer	(g·cm^−³)	K (GPa)	G (GPa)	φ (°)	C (MPa)	T (MPa)
The upper surrounding rock	2.845	45.319	11.289	50.58	4.808	5.494
The phosphate rock layer	3.021	14.219	8.5740	60.76	1.052	2.010
The lower surrounding rock	2.846	25.786	16.599	53.60	1.732	3.643
Backfill	2.200	18.788	12.432	40.00	0.200	0.300

T, tensile strength; C, cohesion; φ, internal friction angle; K, bulk modulus; G, shear modulus; ρ, density.