Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

Table 3

Triaxial unloading creep test results.

Samples	(MPa)	(MPa)	Differential stress (MPa)	Instantaneous strain increment (10^−2)		Creep strain increment (10^−2)		Ratio of creep strain increment to instantaneous strain increment (%)
				Axial	Radial	Axial	Radial	Axial	Radial
T0 specimen	178	20	158	0.4786	−0.1516	0.0528	−0.0396	11.0322	26.1214
		17	161	0.0786	−0.0585	0.0425	−0.0407	54.0712	69.5726
		14	164	0.0695	−0.0653	0.0433	−0.0437	62.3022	66.9219
		11	167	0.0737	−0.0703	0.0470	−0.0491	63.7720	69.8435
		8	170	0.0918	−0.0878	0.0674	−0.0788	73.4205	89.7494
T10 specimen	166	20	146	0.5114	−0.1814	0.0553	−0.0414	10.8135	22.8225
		17	149	0.0757	−0.0597	0.0467	−0.0452	61.6909	75.7112
		14	152	0.0764	−0.0620	0.0477	−0.0489	62.4346	78.8710
		11	155	0.0803	−0.0773	0.0486	−0.0923	60.5230	119.4049
T20 specimen	154	20	134	0.5907	−0.2117	0.0617	−0.0489	10.4452	23.0987
		17	137	0.0781	−0.0574	0.0472	−0.0497	60.4353	86.5854
		14	140	0.0820	−0.0660	0.0533	−0.0553	65.0000	83.7879
		11	143	0.0891	−0.078	0.0563	−0.0646	63.1874	82.8205
		8	146	0.0847	−0.0864	0.0771	−0.1076	91.0272	124.537
T40 specimen	134	20	114	0.6134	−0.2244	0.0696	−0.0537	11.3466	23.9605
		17	117	0.0849	−0.0678	0.0638	−0.0580	75.1472	85.5457
		14	120	0.0839	−0.0717	0.0646	−0.0618	76.9964	86.1925
		11	123	0.0843	−0.0811	0.0712	−0.0703	84.4603	86.6831
		8	126	0.0912	−0.0853	0.1030	−0.1268	112.9386	148.6518
T60 specimen	120	20	100	0.6630	−0.2460	0.0678	−0.0612	10.2262	24.8780
		17	103	0.0842	−0.0708	0.0794	−0.0683	94.2993	96.4689
		14	106	0.0866	−0.0837	0.0742	−0.0785	85.6813	93.7873
		11	109	0.0911	−0.0929	0.0804	−0.0812	88.2547	87.4058
		8	112	0.0958	−0.0988	0.0928	−0.1160	96.8685	117.4089