Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

Table 1

Basic physical and mechanical parameters of the coal specimen.

(g/cm^3)	(km/s)	(GPa)	(GPa)		(MPa)	(MPa)
1.21	1.12	8.70	47.06	0.32	19.47	0.96	0.18

Note.   is density;   is P-wave velocity;   is Young’s modulus;   is softening modulus;   is Poisson’s ratio;   is compressive strength;   is tensile strength;   is burst tendency parameter, .