Experimental Study on Physicomechanical Properties of Sandstone under Acidic Environment

Table 4

Uniaxial compressive test results of the sandstone samples subjected to acid corrosion.

Sample state	Soak solution	Peak intensity, (MPa)	(%)	Axial strain at peak point, (10^−3)	(%)	Elastic modulus, (GPa)	(%)
Natural		88.25		4.03		17.83
Soaking for 30 days	pH = 1 H2SO4	58.14	34.12	5.38	33.50	12.42	30.37
	pH = 3 H2SO4	61.29	30.55	5.09	26.30	13.55	24.03
Soaking for 90 days	pH = 1 H2SO4	47.06	46.67	13.01	222.83	8.49	52.37
	pH = 3 H2SO4	57.67	34.65	10.63	163.77	10.82	39.30
Soaking for 180 days	pH = 1 H2SO4	34.28	61.16	21.02	421.59	3.36	81.17
	pH = 3 H2SO4	54.39	38.37	13.17	226.80	4.61	74.17