基于概率分析的渗流计算方法及应用  

Calculation method of seepage and its application based on probabilistic analysis

作　　者：魏海[1] 沈振中[1] 

机构地区：[1]河海大学水利水电工程学院,南京210098

出　　处：《岩土力学》2007年第S1期385-388,共4页Rock and Soil Mechanics

摘　　要：以随机理论为基础,把岩土体渗透系数视为随机变量。根据渗透系数的概率分布,把岩土体视为按概率分布的不同渗透系数介质的混合体,不同渗透系数介质对渗流场产生贡献的大小由其概率的大小来确定。在确定岩土体渗透系数后,通过渗流方程就可求出不同渗透系数作用下区域内的水头分布和断面流量,再根据渗透系数的概率大小进行叠加,求出整个区域内的水头分布和断面流量。工程实例表明,该方法较确定性有限元法误差小,可作为渗流计算的又一方法用于渗流分析。Based on the statistic theory,seepage coefficient of rock and soil is considered as random variable. Therefore rock and soil can be assumed to be mixture with different seepage coefficients of isotropic media,according to the probability distribution of seepage coefficient. The contribution of rock and soil with different seepage coefficient to seepage field are determined by their probability. After determination seepage coefficient of rock and soil,water head of region and flux of section can be obtained by solution seepage equations with different seepage coefficients. As a result,the final water head of region and flux of section are weighted by the probability distribution of seepage coefficient. This method is proved by engineering example with fewer errors than FEM,so it can be another way used to analyze seepage.

关 键 词：概率分析 岩土渗流 渗透系数 叠加原理 有限元法 

分 类 号：TV223.4[水利工程—水工结构工程]