Study on Energy Dissipation Characteristics and Damage Law of Backfill under Cyclic Impact

Table 1

Basic static mechanical parameters of DM, CTB_1 : 4, and CTB_1 : 6.

Specimen	Compressive strength (MPa)	Modulus of elasticity (GPa)	Poisson’s ratio	Density (kg·m^−3)	Wave velocity (m·s^−1)
DM	53.32	78.71	0.20	2.93	5800
CTB1 : 4	2.93	0.63	0.30	1687.3	1898
CTB1 : 6	1.59	0.45	0.32	1735.2	1878