盐穴储气库溶腔夹层应力分布规律

 针对层状盐岩地层水溶造腔过程中不溶性夹层的破坏坍塌现象，建立了夹层力学分析模型，应用小挠度薄板弯曲理论求解，得到了夹层剖面内各应力分量的分布规律。对夹层破坏坍塌条件进行分析，给出了一种计算夹层极限跨度的方法。研究成果为盐穴储气库水溶造腔过程中夹层破坏坍塌的预测提供了理论依据和有效的计算方法。

Stress Distribution Rules of Interlayer in Salt Caverns Gas Storage

The insoluble interlayer can have a major impact on the shape development of salt caverns when building salt caverns gas storage. A mechanical model of the interlayer is established and solved by bending theory of thin plates with small deflections for collapsing of interlayer in salt caverns gas storage. The stress distribution rules and collapsing conditions of the interlayer are analyzed with the mechanical model. A computing method is provided for ultimate span of the interlayer. Distribution characteristics of various stress components in the section of the interlayer are computed with engineering examples, and the collapse of position under the conditions of varying thickness of interlayer is computed. The results show that the maximum shear stress occurs in the middle plane of the fixed end of the interlayer, and the maximum normal stress occurred in the upper and lower end faces of the fixed end of the interlayer. Shear failure occurs at the fixed end of the interlayer when the maximum shear stress reaches its limit value. Tensile failure occurs at the fixed end of the interlayer when the maximum normal stress reaches its limit value. Engineering practice has proved that the greater the thickness of the interlayer, the larger the collapsing span. A theoretical basis and computing method are provided for prediction of collapsing of interlayer in salt caverns gas storage.