The Physicomechanical Deterioration Characteristics and Mesoscopic Damage Analysis of Sandstone under Acidic Environment

Table 7

Regression parameters of the relationship between the damage variables and soaking time.

Soaking solution	a	b	R^2
pH = 1 H2SO4	0.031	0.534	0.999
pH = 3 H2SO4	0.030	0.472	0.996
pH = 5 H2SO4	0.031	0.428	0.996
pH = 1 HCl	0.039	0.499	0.999
pH = 3 HCl	0.038	0.438	0.999
pH = 5 HCl	0.034	0.422	0.997