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

Table 2

Three-dimensional axial compression test parameters of tuffaceous sandstone under different freeze-thaw cycles.

Parameter	Times of freeze-thaw cycles
	0	10	20	40	60
Peak strength (MPa)	254.26	236.60	220.25	190.75	171.67
Peak strain (10^−3)	7.5	7.9	8.0	8.3	8.7
Elastic modulus (GPa)	42.5	37.9	36.5	34.6	33.8
Cohesion (MPa)	275.45	255.43	246.64	212.54	193.32
Internal friction angle (degrees)	50.8	50.4	50.3	46.8	36.7