闸坝地基渗流计算中边界条件敏感性分析研究  

Sensitivity analysis on boundary conditions in numerical simulation of seepage flow through dam foundation

作　　者：张延忠[1] 廖华胜[1] 刘达[2] 姚勇 曲宏略[4] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065 [2]广东省水利水电科学研究院,广州510610 [3]四川省遂宁市水利局,四川遂宁629000 [4]四川大学水电学院,成都610065

出　　处：《水力发电学报》2008年第1期118-123,117,共7页Journal of Hydroelectric Engineering

基　　金：教育部留学归国人员启动资金(教外司留2004-527);“跨世纪优秀人才培养计划”资金(教技1998-1)

摘　　要：在渗流计算中,计算结果的准确性与渗流区边界条件的选取有很大关系。为获得渗流场数值模拟时边界条件对渗流场及渗流特征参数如渗流量、水力坡降的影响程度,本文进行了渗流边界条件对渗流场及渗流特征参数敏感性分析,主要针对沙湾水电站闸坝基础渗流计算模型的入渗边界η1、出渗边界η2及相对不透水层边界ηD等渗流区边界处于不同位置时,分析其对计算结果的影响,及对渗流参数的敏感程度。结果表明,上下游渗流边界及相对不透水层对渗流场、渗流量及渗透坡降均存在敏感区间。The exactness of computed results is greatly influenced by the choosing appropriate boundary conditions in seepage flow computation, which is generally selected by engineering experience in most computation cases. How to determine the computational domain has a significant influence on the exactness of the result in seepage flow computation. In order to obtain the sensitive seepage rate and hydraulic gradient in the seepage zone, boundary condition sensitivity analysis on seepage rate and hydraulic gradient in seepage computation has been done in this paper. The computed result shows that seepage rate and hydraulic gradient vary in some range under different boundary conditions and the extent of sensitivities under boundary conditions is different. Therefore, the sensitivities should be considered for the seepage simulation.

关 键 词：渗流力学 敏感性分析 数值模拟 边界条件 闸坝基础 

分 类 号：TV223.4[水利工程—水工结构工程]