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

Table 1

Physical parameters of tuffaceous sandstone samples under different freeze-thaw cycles.

Wave velocity (m/s)	Times of freeze-thaw cycles
	A1	A2	A3	A4	A5	VP
0	4356.25	4536.68	4451.35	4287.56	4468.88	4420.144
10	4298.64	4449.86	4386.62	4203.25	4270.05	4321.684
20	4208.65	4320.52	4298.55	4126.38	4150.32	4220.884
40	4115.24	4202.35	4167.68	4057.52	4007.38	4110.034
60	3955.68	4106.78	4179.35	4065.45	3880.55	4037.562
Mass increment (g)	A1	A2	A3	A4	A5	M
0	0	0	0	0	0	0
10	1.46	0.97	1.29	1.01	2.31	1.41
20	3.06	1.06	4.35	4.28	3.74	3.30
40	9.48	4.97	9.96	9.24	7.53	8.24
60	10.70	5.36	11.63	10.12	8.21	9.20