含夹层盐岩圆柱形储库力学特性的理论解析

THEORETICAL ANALYSIS OF MECHANICS BEHAVIOR OF CYLINDER STORAGE CAVERN IN ROCK SALT CONTAINING INTERLAYER

Salt caverns are created by the method that circulating fresh water into the salt formation to dissolve the salt，so the cavern?s ratio of radius to height is small and the cavern can be simplified into a hollow cylinder. The intermediate zone of the cavern was sectioned to take as research object. Considering the fact that the salt deposit in China is characterized by more interlayer，an equivalent calculation model was established to discuss the stress distribution function near the layer，based on the method of equivalent relative displacement on contact surface between rock salt and interlayer and actual state. Where assuming the contact surface is smooth，and thus the elasticity solutions of the thick-walled cylinder could be used to calculate stress distribution，then local internal pressure near the interlayer are increased and decreased to adjust the relative displacement until equivalent to actual state. The contrast between the numerical simulation and analytic solution shows that two results on stress distribution considering effect of interlayer is basically the same，in which maximum error of radial stress ?r and circumferential stresson cavity surface are less than 6.8% and 2.7% respectively. The analytic result meets require of storage cavern design analysis.