使用离散的气-水界面模拟裂隙网络非饱和渗流

FLUID FLOW IN UNSATURATED FISSURES MODELED BY DISCRETE AIR-WATER INTERFACE

非饱和带裂隙中的饱和区和排干区可以用一个离散的气-水界面分隔开。此气-水界面的位置可以用边界元数值方法通过迭代确定,这样就可以实现对单裂隙内非饱和渗流的描述。将此数值方法推广到裂隙网络中,为用离散裂隙网络模型模拟裂隙岩体非饱和渗流提供了初步的框架。几个算例的计算结果验证了计算程序的正确性。

A numerical method for fluid flow in unsaturated fissures is presented. The capillary theory and the unsaturated flow features for unsaturated fracture are studied simultaneously. A discrete air-water interface is used to separate the saturated zones from the drained zones within each single fracture of fracture network. A numerical method is developed to look for the position of the equilibrium air-water interface by using the Newton-Raphson iteration scheme, which can give a frame for modeling unsaturated flow in fractured rocks with the discrete fracture network models.