Effects of interlayer on stress and failure of horizontal salt cavern
MA Xuqiang1，YANG Chunhe1，2，SHI Xilin1，LI Yinping1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics， Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering，Ministry of Education，Chongqing University，Chongqing 400044，China)
In terms of its volume，horizontal salt cavern is appropriate for the thin bedded salt in China，but it would probably intersect with the interlayer. In order to analyze the effects of interlayer on stress and failure of horizontal salt cavern，a model of horizontal salt cavern with interlayer was built. The analytic solutions of stresses of the interlayer and the interface were obtained based on the force balance of the interlayer element and the mechanism of load transfer on the interface. Then the stress formulas and the Mohr-Coulomb criterion were combined together to analyze the interface sliding and the plastic zone of the surrounding rock. It was found that the shear stress on the interface was proportional to the relative displacement of the salt rock and the interlayer. The shear stress on the interface attained its maximum near the salt cavern，and the interface sliding most easily occurred there. The shear stress on the interface increased with the elasticity modulus and the thickness of interlayer. The equilibrium equation of the interlayer indicated that the derivative of the radial stress in the interlayer was related to the shear stress on the interface. The direction of the shear stress changed at the neutral point. Therefore，the radial stress in the interlayer decreased first and then increased. The principle stressess1 and s3 were the tangential stress and the radial stress. The tangential stress of the interlayer was equal to that of the salt rock and the radial stress of the interlayer was less than that of the salt rock. So the plastic zone of the interlayer was wider than that of the salt rock.
马旭强1，杨春和1，2，施锡林1，李银平1. 夹层对水平盐穴应力和破损的影响[J]. 岩石力学与工程学报, 2017, 36(S1): 3314-3320.
MA Xuqiang1，YANG Chunhe1，2，SHI Xilin1，LI Yinping1. Effects of interlayer on stress and failure of horizontal salt cavern. , 2017, 36(S1): 3314-3320.
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2017, Vol. 36 
