The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Table 1

The parameter under different water and force conditions.

Porewater pressure (MPa)	The parameter
	Confining pressure; 10 MPa	Confining pressure; 20 MPa	Confining pressure; 30 MPa	Confining pressure; 40 MPa
2	3.05	2.33	1.90	1.65
4	2.91	2.25	1.86	1.63
6	2.79	2.09	1.79	1.6
8	2.7	1.99	1.73	1.56