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

Table 2

Deterioration degree of sandstone mechanical parameters under different confining pressures.

Freeze-thaw cycles times	Confining pressure	Deterioration degree Cn (%)
		Extreme stress (MPa)	Elastic modulus (GPa)	Poisson’s ratio
0	0	0	0	0
	2	−244.49	−10.08	0.77
	4	−364.59	−30.00	1.92
	6	−487.85	−30.87	2.30
5	0	0	0	0
	2	−225.90	−49.37	3.36
	4	−275.92	−67.47	4.10
	6	−505.65	−80.51	4.85
10	0	0	0	0
	2	−234.24	−51.91	3.32
	4	−397.63	−69.38	4.06
	6	−518.92	−74.11	4.43
20	0	0	0	0
	2	−202.91	−68.24	3.94
	4	−382.80	−101.51	5.38
	6	−510.91	−134.40	6.81
40	0	0	0	0
	2	−220.21	−37.86	1.07
	4	−418.66	−78.06	2.86
	6	−544.47	−80.97	3.93