Research on Evolution Characteristics of Unloading Energy in Excavation Face of High-Stress Pillar

Table 1

Mechanical parameters of backfill and ore in a certain ore in Eastern Hebei province.

Name of ore rock	Shear modulus (MPa)	Bulk modulus (MPa)	Cohesion (MPa)	Elastic modulus (MPa)	Poisson’s ratio
Ore body	3.32 × 10^3	4.62 × 10^3	1.72	8.03 × 10^3	0.21
Surrounding rock	4.39 × 10^3	1.57 × 10^3	2.38	6.98 × 10^3	0.26
Filling body	1.18 × 10^2	1.51 × 10^2	1.05	2.8 × 102	0.19