Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

Table 1

Scheme for test of cyclic loading and cyclic creep.

Test type	No.	Maximum stress ratio (%)	σmax (MPa)	Minimum stress ratio (%)	σmin (MPa)	Holding time (h)
Cyclic loading	X1	70	31.96	20	9.13	0
	X2	75	34.25
	X3	80	36.53
	X4	85	38.81
Cyclic creep	R1	60	27.40	20	9.13	1
	R2	65	29.68
	R3	70	31.96

Note: The maximum stress ratio in the table is the ratio between the maximum stress of the test load and the compressive strength of rock salt; the minimum stress ratio is the ratio between the minimum stress of the test load and the compressive strength of rock salt.