裂隙介质中的多重裂隙网络渗流模型

MULTIPLE FRACTURE NETWORK SEEPAGE MODEL FOR FRACTURED MEDIA

提出了多重裂隙网络渗流模型的思想 ,即按各种地质结构在空间的展布规模 ,将裂隙岩体处理成离散的主干裂隙网络系统、分支裂隙网络系统和可以概化的等效网络系统 ,认为裂隙介质由它们构成。为了突出主干和分支网络的特殊性 ,提出了节理单元模型并专门推导了节理单元的连续性方程。建立了多重裂隙网络渗流数学模型 ,并用一个简单的算例比较了它与传统模型在计算结果上的差异。

The multiple fracture network seepage model for fractured media is put forward. Faults, fractures and matrices are divided into 3 different groups according to their dimensions: (1) the trunk network composed of faults and fractures, which dominates the seepage field, (2) the branch network composed of comparatively smaller fractures, and (3) the equivalent network composed of the smallest fractures and rock matrices, which provides space to store fluid. The branch network connects the other two network systems. A joint element is presented to represent the trunk and branch networks and used to derive the continuity equation for these two network systems. An example is given to show the difference between the classic model and the new model.