Creep Behaviors of Interlayers around an Underground Strategic Petroleum Reserve (SPR) Cavern in Bedded Salt Rocks

Table 1

Loading ratios (k) and the corresponding loading stresses.

Loading ratios	Sample	0.4	0.5	0.6	0.7	0.8	0.9
(MPa)	Natural sample	10.24	12.79	15.34	17.89	20.44	22.99
	Sample after oil erosion	6.52	8.15	9.78	11.41	13.04	14.67