盐岩地下储库洞室收缩形变分析  

Shrinkage Analysis Of Salt Cavern Storage

作　　者：丁国生[1] 杨春和[1] 张保平[1] 谢萍[1] 张昱文[1] 

机构地区：[1]中国石油大学,中国科学院武汉岩土所,中国石油勘探开发研究院廊坊分院,北京102249,武汉430071,河北廊坊065007

出　　处：《地下空间与工程学报》2008年第1期80-84,共5页Chinese Journal of Underground Space and Engineering

摘　　要：盐岩类地下储库在运行过程中盐岩洞室内部压力从高到低、从低到高的循环变化,因此洞室周围的盐层会受到周围地层的压力和洞室内部压力的多重作用而产生应力变化,由于盐层在高压作用会产生塑性形变,而且,洞室内部的压力始终小于周围地层的压力,因此洞室周围盐层会产生指向洞室内部的位移而导致洞室收缩形变。洞室的收缩形变会导致洞室体积缩小,从而导致储库洞室库容的变化,降低洞室的运行效率。洞室的收缩形变与盐层蠕变规律有密切的联系,通过岩石力学测定,可以分析盐层蠕变特征进而建立盐岩蠕变的本构方程,利用本构方程,通过建立洞室三维模型,可以模拟不同运行状态下的洞室不同部位在不同运行阶段内盐层蠕变的大小,从而预测整个洞室的收缩形变规律。对盐岩洞室储库的运行模拟发现,洞室建成初期有一个短暂的快速收缩形变阶段,后期收缩形变速度较为平稳并有逐步减缓的趋势。因此在盐岩洞室储库运行的初期,必需密切注意洞室蠕变,制定合理的运行参数,确保洞室的安全高效运行。The pressure of salt cavern storage changes in a high - low-high cycle within a particular range, the stress in salt rock around cavern varies because of the upside strata and cavern inner pressure. The salt rock will creep when it is under high pressure, and because the cavern inner pressure is always lower than the upside strata pressure, so the rock around cavern will move toward the cavern center and it causes the cavern to be deformed and shrunk. The cavern shrinkage will lead to volume loss and lowering down the cavern operation efficiency. The shrinkage of cavern has relationship with salt creep and from laboratory creep test and creep modeling, the constitutive equation can be created for description of salt creep behavior. By using constitutive equation and 3 -D cavern model, the creep displacement in different point of salt cavern can be modeled and predicted with different operation condition. In a case study, there is a fast shrinkage in the beginning of cavern operation, and then the shrinkage slows down and becomes stable. Therefore, in the beginning of cavern operation, the operator must draw up legitimate operating parameters and monitor cavern creep to ensure the safety and high efficiency.

关 键 词：盐岩 洞室 储库 收缩 蠕变 

分 类 号：TU91[建筑科学—建筑理论]