Collaborative Mining Sequence Optimization for Multiple Stopes under Intensive Mining

Table 1

Mechanical parameters of the rock mass and backfill.

Rock layer	ρ (g·cm^−³)	K (GPa)	G (GPa)	Φ (°)	C (MPa)	T (MPa)
Surrounding rock	2.85	35.55	13.94	52.09	3.27	4.57
Phosphate rock layer	3.02	14.22	8.57	60.76	1.05	2.01
Backfill	2.20	2.86	2.61	38	1.40	0.60