Study on Mechanical Properties and Damage Characteristics of Red Sandstone under Freeze-thaw and Load

Table 1

Deterioration degree of red sandstone mechanical parameters under different freeze-thaw cycles.

Confining pressure	Freeze-thaw cycles times	Deterioration degree Cn (%)
		Extreme stress (MPa)	Elastic modulus (GPa)	Poisson’s ratio
0	0	0	0	0
	5	4.96	31.19	−3.07
	10	10.17	39.60	−4.23
	20	11.37	58.33	−7.31
	40	21.96	59.13	−7.69
2	0	0	0	0
	5	10.09	6.63	−0.39
	10	10.34	21.43	−1.55
	20	14.28	35.83	−3.88
	40	21.42	48.81	−7.36
4	0	0	0	0
	5	2.65	10.81	−0.78
	10	3.78	20.82	−1.96
	20	7.89	34.52	−3.53
	40	12.87	43.76	−7.06
6	0	0	0	0
	5	2.09	5.09	−0.39
	10	5.42	19.65	−1.97
	20	7.50	24.80	−2.36
	40	11.25	43.48	−5.91