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

Table 2

Sandstone samples grouping.

Group number	pH value	Soaking state	Sample number	Wave velocity range (m/s)	Mass range
1		Natural rock samples	#1∼4	2467∼2775	529.67∼534.8
2	1, 3, 5	Sulfuric acid	#5∼28	2416∼2477	523.93∼533.08
3	1, 3, 5	Hydrochloric acid	#29∼52	2941∼2973	522.69∼528.92
4	7	Distilled water	#53∼60	2487∼2546	522.41∼529.26