变开度的岩体裂隙网络非稳定渗流数值分析  

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

作　　者：何杨[1] 柴军瑞[1] 李康宏[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《水电能源科学》2005年第5期44-46,72,共4页Water Resources and Power

基　　金：国家自然科学基金项目(10202015);三峡大学湖北省"楚天学者计划"特聘教授资助项目(8096);教育部留学回国人员科研启动基金(106-220331);陕西省教育厅自然科学专项(03JK098);西安理工大学科技创新计划(106-210303;220275);三峡大学科技创新团队计划(603402);湖北省青年杰出人才基金项目(2004ABB012)

摘　　要：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。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.

关 键 词：渗流分析 裂隙网络 非稳定渗流 MONTE-CARLO方法 张开度 偏流效应 

分 类 号：TV139.14[水利工程—水力学及河流动力学]