一种裂隙岩体渗流场有限元分析的改进模型

An Improved Model for Finite Element Analysis of Seepage for Joint Rock Masses

研究裂隙岩体渗流的模型有等效连续介质模型、裂隙网络模型和双重介质模型等。等效连续介质模型受到样本单元体REV的限制,裂隙网络模型和双重介质模型复杂,处理难度较大。为此,在分区的同时考虑结构面和岩块的渗透特性,并考虑结构面法向与岩块之间的水力交换,利用两类介质接触处水头相等及节点流量平衡建立新的模型。对所建立模型的渗流场有限元公式进行推导,并通过与试验结果对比验证了该模型的正确性及实用性。

Equivalent continuum medium model, Fracture network model and Double-porosity medium model have been used to study the seepage of joint rock. If there is no REV or the REV is big, the Equivalent continuum medium model can not be used. The basic theory of Fracture network model and Double-porosity medium model is complicated, and the application of the two models is not convenient in some time. An improved model, which considers the joint face and rock mass respectively at the same time, has been advised in this paper. In this model the equation is established and u- nified solution is made, considering the hydraulic exchange between the structure plane in normal direction and the rock mass and according to the equal water pressure of two kinds of medium. The deduction of seepage finite element formulation of the model is made, and the validity and the practicality of the model are proved in this paper.