The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Table 2

Model-relative error results.

Failure criterion	The parameter
	Confining pressure; 10 MPa	Confining pressure; 20 MPa	Confining pressure; 30 MPa	Confining pressure; 40 MPa
Water-rock coupling	0.95	-2.5	-0.53	0.77
D-P	17.14	18.82	22.49	22.79
H-B	16.32	17.92	21.42	21.7