应用两场耦合理论解析复杂岩基长期变形疑点

针对地质条件复杂,包含黏、塑性裂隙和软弱夹层等断裂带岩体的复杂混凝土坝坝基,在高水头渗流场与岩基流变的长期变形特性耦合作用下,对大坝系统结构性态的影响,结合原型观测资料和工程实例的地质力学分析,应用黏弹性、黏弹塑性有限元方法对复杂混凝土坝坝基岩体渗流与流变耦合的效应问题进行了深入研究.结果表明,该方法能合理解析实际工程在复杂混凝土坝坝肩和坝基地质条件、运行条件下产生的长期变形疑点.

Analysis on potential sites of long-term deformation in a complicated rock foundation by seepage-stress coupling method

The complicated concrete dam foundation which is characteristic of complicated geological conditions has a great influence on structure behaviour of dam system through the coupling action of a high water-head seepage field and the rock foundation creep.Based on the geomechanical analysis of prototype observation data and an engineering example,the coupling effect of seepage and creep of the complicated concrete dam bedrock is studied using the viscoelasto-plastic finite element method.The calculated displacements agree well with the measurements,demonstrating that this method can reasonably identify potential sites of long-time deformation.