Experimental Study on the Mechanical Properties of Sandstone under the Action of Chemical Erosion and Freeze-Thaw Cycles

Table 3

Internal friction angle and cohesion strength of sandstone samples under the coupling action of chemical solution erosion and freeze-thaw cycles.

Chemical solution	Number of freeze-thaw cycles	Internal friction angle (°)	Cohesion strength (MPa)	R^2
Acid solution	0	32.09	5.00	0.982
	15	30.11	4.60	0.983
	30	30.31	4.28	0.979
	45	28.77	4.23	0.973
	60	32.37	3.23	0.996
Neutral solution	0	30.96	5.91	0.971
	15	29.94	5.75	0.969
	30	30.82	5.25	0.936
	45	28.90	4.95	0.933
	60	29.79	4.30	0.977
Alkaline solution	0	30.12	5.87	0.994
	15	29.20	5.52	0.982
	30	30.39	4.75	0.974
	45	28.83	4.70	0.951
	60	29.24	4.15	0.984