渗流逸出面确定方法的改进及实例验证

发布时间：2018-01-27 05:39

本文关键词： 渗流自由面逸出面批量节点处理 APDL　出处：《沈阳农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：渗流计算对于设计阶段的坝型选择、尺寸拟定、竣工后的运行安全都至关重要。本文分析了前人的研究成果,在此基础上对渗流计算问题进行探讨。首先,对渗流分析方法进行阐述,主要分为解析法、实验分析法、数值模拟法。在数值解法中,自由面及逸出面的处理是求解的关键问题。自由面的处理方法比较成熟,分为剩余流量法、单位传导矩阵调整法、初流量法、虚单元法和截止负压法等。处理逸出面的方法分为近边界面浸润线延长线法、单个节点处理法、批量节点处理法等。本文详细讨论了各种逸出面处理方法,并进行了评价。经过综合对比,肯定了批量节点处理法的优势。随后,文章对批量节点处理法进行了梳理归纳,从变分原理的角度阐述了逸出面问题的一些规律,对现有的批量节点处理法进行了验证并对各个方法的有效性给予评价。根据对现有批量逸出点的讨论,本文提出了逸出面的改进的处理方法,即同时进行水头检验H法和流量检验Q法。根据所提方法,采用通用有限元软件ANSYS的APDL语言进行编程,在程序中对自由面、逸出面、程序总体框架、收敛标准等问题逐个进行解决并完成了程序代码的编写。文章的最后运用所编写程序对所提方法进行验证。分别进行了二维和三维模拟,在二维模拟中验证了本文所提方法的正确性、对于解决多个逸出点问题的有效性;在三维模拟中验证了所提方法对三维模型的适用性性。
[Abstract]:Seepage calculation is very important for dam type selection, size determination and operation safety after completion. Based on the analysis of previous research results, the seepage calculation problem is discussed. First of all. The seepage analysis method is described, which is divided into analytical method, experimental analysis method and numerical simulation method. The treatment of free surface and free surface is the key problem to solve the problem. The free surface processing method is more mature, including residual flow method, unit conduction matrix adjustment method, initial flow method. Virtual element method and cut-off negative pressure method. The methods to deal with escape are extended line method, single node processing method, batch node processing method and so on. In this paper, a variety of escape processing methods are discussed in detail. After comprehensive comparison, the advantages of batch node processing method are confirmed. Then, the article summarizes the batch node processing method. From the point of view of variational principle, this paper expounds some laws of the problem of escape, validates the existing batch node processing method and evaluates the effectiveness of each method. According to the discussion of the existing batch escape points. In this paper, an improved method is put forward, that is, the water head test H method and the flow check Q method are carried out simultaneously. According to the proposed method, the general finite element software ANSYS APDL language is used to program. In the process of free surface, escape, the overall framework of the program. Convergence standard and other problems are solved one by one and the programming code is completed. Finally, the proposed method is verified by the program written in this paper. Two and three dimensional simulations are carried out respectively. In the two-dimensional simulation, the correctness of the proposed method is verified, and it is effective to solve the problem of multiple escape points. The applicability of the proposed method to the three-dimensional model is verified in three-dimensional simulation.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV139.1

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