内压对含软弱夹层盐岩储库稳定性影响的研究

Numerical simulation research on the influence of inner pressure stability of salt cavern storage including weak interlayer

通过建立含不同夹层厚度的圆柱形储库单腔三维模型,考虑不同恒压作用下长期蠕变,从腔体收缩率,围岩塑性区及位移矢量分布角度,分析运行内压对含软泥夹层盐岩腔体稳定性的影响。结果表明,腔体维持较高的运行压力,能有效减少腔体收缩,腔周塑性区及位移矢量发展,有利于腔体稳定。另外软泥夹层厚度在一定范围内增长对腔体的稳定性影响不太,在高内压作用下甚至可以忽略,这一结果对含软弱夹层层状盐岩腔体模型简化具有一定的指导意义。

In order to analyze the influence of inner pressure on stability of salt cavern storage from the perspective of shrinkage rate, plastic zone and displacement vector, corresponding simulation models of cylindrical storage cav- erns were established, considering different interlayer thickness and creep effect under several long term operation pressures. The results demonstrate that a high operation pressure has obvious advantages and can remarkably reduce shrinkage rate, plastic zone and displacement vector, which is good to stability of underground salt cavern storage. The results also indicate that weak interlayer thickness influence on stability of storage salt cavern is very small when it within a certain range, especially under extremely high pressure it even can be for the design and operation of layered underground salt cavern. ignored , which is important