渗流场排水子结构法有限元分析的局部非协调网格解法  

Local incompatible meshes for finite element analysis in drainage substructure method for solution of seepage field

作　　者：周桂云[1] 李同春[1] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098

出　　处：《水利水电科技进展》2007年第2期26-29,共4页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金资助项目(90510017)

摘　　要：在分析用排水子结构法求解渗流场的基础上,针对排水子结构网格疏密交界处的网格非协调问题,提出了局部非协调网格的协调水头解法。该方法根据结点性质将总自由度分为主要自由度和从属自由度,基于线性内插原理,用牛顿迭代法计算插值系数。以江口水电站工程为例,对江口拱坝坝基渗流场进行了求解,计算得正常蓄水位工况渗流量为93.2 L/s,死水位工况渗流量为42.4 L/s,校核洪水位工况渗流量为119.6 L/s,这些结果均小于设计的抽排能力(150 L/s),满足工程要求,说明本文方法是合理的。Based on an analysis of the drainage substructure method for solution of seepage field, the compatible water level method for local incompatible meshes was proposed to deal with the problem of incompatible meshes at the intersection of dense meshes and sparse meshes of the drainage substrcture. In the method, the degrees of freedom corresponding to each node were divided into the main degrees of ftreedom and the dependent degrees of freedom, and the Newton iteration method, based on linear interpolation principle, was adopted for calculation of the interpolation coefficeient. As a case study, the seepage field of Jiangkou arch clam foundation was calculated. The seepage quantifies were 93.2L/s,42.4L/s,and 119.6L/s at normal water level, dead water level, and cheek flood level, respectively, and the results were less than the design pumping capacity of the dam, therefore, the method was verified to be reasonable.

关 键 词：渗流场 排水孔 排水子结构 局部非协调网格 协调水头解法 江口水电站 

分 类 号：TV223.6[水利工程—水工结构工程] O241.82[理学—计算数学]