变开度的岩体裂隙网络非稳定渗流数值分析

根据裂隙的几何特性所服从的分布特征,利用Monte-Carlo方法模拟岩体裂隙网络分布以及裂隙张开度.基于裂隙岩体网络非稳定渗流数学模型,编制程序并通过工程算例进行分析比较.结果表明：运用Monte-Carlo方法模拟岩体裂隙网络分布状况是比较好的方法;变开度时岩体裂隙渗流有明显的偏流效应现象,裂隙变开度时其滞后效应比等开度时更加明显;在变开度条件下,当上下游水头差较大时,水头分布变化受张开度的影响较大,不宜忽略,当上下游水头差较小时,影响非常小可以忽略.

Numerical Analysis of Unsteady Seepage Through Fracture Network with Varying Apertures in Rock Mass

Aperture is one of the most important parameterto permeability of the fracture rock mass. The distribution of the fracture network and apertures of fracture in the rock mass is simulated by the Monte-Carlo method. The programs are made based on the mathematic model of the unsteady seepage in the fracture network. An engineering exampleis analyzed by the programs. It can be shown that it is a good method to use Monte-Carlo method to simulate the character of rock mass; the hysteresis of the seepage head distribution is more obvious on the variable apertures condition than on the invariable apertures; the seepage have obvious deflection flow effect; the seepage head distribution can be effected by variable apertures greatly when the boundary head condition between the up-stream and the down-stream water level is varying greatly.