Study on Instability Mechanism of Extraction Structure under Undercut Space Based on Thin Plate Theory in Block Caving Method

Table 1

Physical and mechanical parameters of rock mass in the model.

Item	Elasticity modulus, E (GPa)	Bulk density, ρ (kg/m^3)	Cohesive strength, C (MPa)	Shear modulus, G (GPa)	Internal friction angle, Φ (°)	Tensile strength, σt (MPa)	Poisson ratio, μ
Value	5.99	2740	6.6	2.45	42.58	6.62	0.22