Study on the Instability Mechanism and Grouting Reinforcement Repair of Large-Scale Underground Stopes

Table 1

Rock mass mechanical parameters.

Name	Elasticity modulus (MPa)	Poisson’s ratio	Volume weightt/m³	Cohesive force (MPa)	Internal friction angle (°)	Strength of extension (MPa)
Filling body 1	2750	0.19	2.11	0.74	38.0	2.39
Ore body	19760	0.30	3.80	2.45	40.3	2.4
Filling body 2	2080	0.21	2.23	0.56	37.7	1.96