Triaxial Creep Behavior of Red Sandstone in Freeze-Thaw Environments

Table 3

Deviatoric stress levels the during triaxial creep tests of red sandstone after freeze-thaw.

Freeze-thaw cycles	Confining pressure (MPa)	Specimen number	P wave velocity (m/s)	Deviatoric stress level (MPa)
				1st	2nd	3rd	4th	5th	6th
0	0	24-8	1148	2.90	3.63	4.35	5.08	5.80	6.53
	2	24-6	1185	8.27	10.34	12.40	14.47	16.54	18.60
	4	24-12	1153	11.81	14.77	17.72	20.67	23.62	26.58
	6	24-45	1197	12.64	15.81	18.97	22.13	25.29	28.45
1	0	24-4	1174	2.43	3.04	3.64	4.25	4.86	5.46
	2	24-16	1174	7.65	9.57	11.48	13.39	15.30	17.22
	4	24-46	1173	10.33	12.91	15.49	18.07	20.66	23.24
	6	24-48	1164	11.99	14.99	17.98	20.98	23.98	26.97
5	0	24-17	1180	2.01	2.12	3.02	3.52	4.02	4.53
	2	24-9	1191	7.12	8.90	10.67	12.45	14.23	16.01
	4	24-27	1174	9.70	11.47	13.25	15.03	16.81	18.59
	6	24-43	1191	11.34	14.18	17.01	19.85	22.68	25.52
9	0	24-26	1148	1.81	2.26	2.71	3.16	3.62	4.07
	2	24-22	1164	6.74	8.43	10.12	11.80	13.49	15.17
	4	24-11	1169	9.28	11.60	13.91	16.23	18.55	20.87
	6	24-31	1180	11.12	13.90	16.67	19.45	22.23	25.01
13	0	24-2	1174	1.73	2.16	2.59	3.02	3.46	3.89
	2	24-1	1180	6.60	8.26	9.91	11.56	13.21	14.86
	4	24-31	1180	9.07	11.34	13.61	15.88	18.14	20.41
	6	24-19	1197	10.99	13.74	16.48	19.23	21.98	24.72