Abstract: The concept of three-dimensional double node jointed element in structural analysis is introduced into fluid-flow model, thus a new type of seepage element is defined, which is named double-node seepage element. This element is analyzed from its physical instinct; while its mathematical expression in matrices is also given. The element presented can be used to simulate the effect of fault on seepage field.

Key words: Fault plane, Vadose, Crack, Finite element, Double-node

摘要： 将岩石结构力学中的三维节理单元的概念引入含裂隙系的渗流模型中,提出双节点渗流单元,用于模拟断层在地下岩体渗流场中的影响与作用,分析其物理意义,给出具体的单元渗流矩阵表达式。

关键词: 断层面, 渗流, 裂隙, 有限元, 双节点