Study on the Dynamic Response Characteristics of Cylindrical Coal-Rock Samples under Dynamic Loads

Table 2

HJC model parameters of the coal-rock.

ρ0 (kg m^−3)	G (GPa)	K1 (GPa)	D1	K3 (GPa)	σmax (MPa)	B	C	T (MPa)
1500	0.58	85	0.0027	208	10	0.7	0.05	1.86
fc^∗ (MPa)	N	K2 (GPa)	D2	Pc (MPa)	Smax (MPa)	A	uc	Pmin (MPa)
9	0.5	−171	1	3	7	0.4	0.0008	−0.3

Note. , fc^∗, G, N, K1, K2, and K3, D1 and D2, Pc,, Smax, A, B, C, uc, T, and Pmin are defined as the density, quasi-static uniaxial compressive strength of coal, shear modulus, pressure hardening exponent, constants used for the material with no voids, damage constants, pressure, failure principal stress, normalized maximum strength, normalized cohesive strength, normalized pressure hardening coefficient, strain rate coefficient, volumetric strain, tensile strength, and minimum failure pressure, respectively.