基于ANSYS的非稳定渗流数值模拟及防渗优化研究
发布时间：2018-07-26 12:40
【摘要】：非稳定渗流问题是水利工程领域常见而又复杂的问题，，很多学者致力于研究如何建立合理有效的渗流数学模型，快速高效地确定出渗流自由面以及渗流场参数。由于非稳定渗流问题本身的复杂性，如何采用数值计算方法进行真实准确的模拟是一个需要不断完善的过程。 本文在前人研究的基础上，收集整理了渗流自由面求解的几种主要方法，对其优缺点进行了评述，并在变单元渗透系数法的基础上提出了改进方法，该方法能够更加真实地模拟非饱和区的渗流情况。 根据渗流基本理论和有限元法基本原理，以福建某人工岛填海工程为例，对其非稳定渗流问题以及防渗优化问题进行了系统地研究，具体内容如下： 通过ANSYS软件有限元分析计算，进行非稳定渗流的数值模拟。由于本工程实例的特殊性，渗流过程中渗流损失量较大，导致内河水位无规律变动。本文通过APDL（ANSYS参数化设计语言）中的DO循环语句实现对计算时间域的离散细分，从而考虑了渗流量引起水位变动对整个渗流分析的影响。考虑人工岛的功能性需求和安全性保障，进行了防渗方案的优化研究。通过非稳定渗流计算，分析确定了人工岛的防渗方案。以渗流量和渗透坡降为控制条件，以防渗体长度为变量，编写APDL命令流。实现了防渗方案的优化分析，对工程建设具有一定指导意义。
[Abstract]:The unsteady seepage problem is a common and complex problem in the field of water conservancy engineering. Many scholars have devoted to study how to establish a reasonable and effective seepage mathematical model to determine the seepage free surface and seepage field parameters quickly and efficiently. Due to the complexity of the unsteady seepage problem, how to use the numerical method to simulate the real and accurate flow is a process that needs to be perfected continuously. On the basis of previous studies, several main methods for solving seepage free surface are collected, their advantages and disadvantages are reviewed, and an improved method is put forward on the basis of variable element permeability coefficient method. This method can simulate the seepage in unsaturated region more realistically. Based on the basic theory of seepage and the basic principle of finite element method, the unsteady seepage problem and seepage control optimization problem of a artificial island reclamation project in Fujian Province are studied systematically. The main contents are as follows: through the finite element analysis and calculation of ANSYS software, the numerical simulation of unsteady seepage is carried out. Because of the particularity of the project, the loss of seepage in the seepage process is large, which leads to the irregular change of the water level of the inland river. In this paper, the discrete subdivision of the computational time domain is realized by the do cycle statement in APDL (ANSYS parametric design language, and the influence of the water level change caused by the seepage discharge on the whole seepage analysis is considered. Considering the functional requirement and security guarantee of artificial island, the optimization of anti-seepage scheme was carried out. Through the calculation of unsteady seepage, the seepage control scheme of artificial island is analyzed and determined. The APDL command flow was compiled with seepage flow and seepage slope as control conditions and the length of seepage control body as variable. The optimization analysis of seepage control scheme is realized, which has certain guiding significance for engineering construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4
本文编号：2146041
[Abstract]:The unsteady seepage problem is a common and complex problem in the field of water conservancy engineering. Many scholars have devoted to study how to establish a reasonable and effective seepage mathematical model to determine the seepage free surface and seepage field parameters quickly and efficiently. Due to the complexity of the unsteady seepage problem, how to use the numerical method to simulate the real and accurate flow is a process that needs to be perfected continuously. On the basis of previous studies, several main methods for solving seepage free surface are collected, their advantages and disadvantages are reviewed, and an improved method is put forward on the basis of variable element permeability coefficient method. This method can simulate the seepage in unsaturated region more realistically. Based on the basic theory of seepage and the basic principle of finite element method, the unsteady seepage problem and seepage control optimization problem of a artificial island reclamation project in Fujian Province are studied systematically. The main contents are as follows: through the finite element analysis and calculation of ANSYS software, the numerical simulation of unsteady seepage is carried out. Because of the particularity of the project, the loss of seepage in the seepage process is large, which leads to the irregular change of the water level of the inland river. In this paper, the discrete subdivision of the computational time domain is realized by the do cycle statement in APDL (ANSYS parametric design language, and the influence of the water level change caused by the seepage discharge on the whole seepage analysis is considered. Considering the functional requirement and security guarantee of artificial island, the optimization of anti-seepage scheme was carried out. Through the calculation of unsteady seepage, the seepage control scheme of artificial island is analyzed and determined. The APDL command flow was compiled with seepage flow and seepage slope as control conditions and the length of seepage control body as variable. The optimization analysis of seepage control scheme is realized, which has certain guiding significance for engineering construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4
【参考文献】
相关期刊论文 前10条
1 陈洪凯,唐红梅,张录坤;渗流自由面求解的基本方法、修正及应用[J];重庆交通学院学报;1997年03期
2 速宝玉;朱岳明;;不变网格确定渗流自由面的节点虚流量法[J];河海大学学报;1991年05期
3 朱岳明,龚道勇;三维饱和非饱和渗流场求解及其逸出面边界条件处理[J];水科学进展;2003年01期
4 李定方;杨静熙;王家妼;;有限单元法在心墙土坝稳定渗流计算中的应用[J];水利水运科技情报;1974年02期
5 谢春红;陈平二;;有限单元法在不稳定渗流中的初步应用[J];水利水运科技情报;1975年02期
6 李定方;李垞贻;陈平;;土坝三向渗流计算[J];水利水运科学研究;1980年03期
7 吴良骥;G·L·Bloomaburg;;饱和—非饱和区中渗流问题的数值模型[J];水利水运科学研究;1985年02期
8 刘洁,毛昶熙;堤坝饱和与非饱和渗流计算的有限单元法[J];水利水运科学研究;1997年03期
9 岳庆河;刘福胜;;库水位回落条件下土石坝边坡稳定分析[J];水利水运工程学报;2008年03期
10 张有天,陈平,王镭;有自由面渗流分析的初流量法[J];水利学报;1988年08期
本文编号：2146041
本文链接：https://www.wllwen.com/kejilunwen/shuiwenshuili/2146041.html
