复合土工膜在滦河生态防洪工程中的应用

发布时间：2018-03-20 18:42

本文选题：滦河生态防洪工程　切入点：复合土工膜　出处：《河北农业大学》2014年硕士论文　论文类型：学位论文

【摘要】：复合土工膜作为一种新型防渗材料，广泛应用于堤防渠道工程、水利水电工程、水库加固防渗工程等方面，并取得了良好的经济效益和社会效益。复合土工膜以塑料薄膜作为防渗基材，与无纺布复合而成的土工防渗材料，它的防渗性能主要取决于塑料薄膜的防渗性能。但是，目前关于复合土工膜的防渗机理及防渗效果也缺乏系统的理论研究，关于复合土工膜的防渗体设计及应用仍局限于半经验半理论状态。在滦河迁安市段生态防洪工程中，使用了大量的复合土工膜。由于堤身填筑材料为强透水性的砂砾卵石混合料，堤身防渗显的尤为重要，在防洪堤迎水坡防渗体中采用了复合土工膜并发挥了显著的防渗和防护作用。为了定量分析复合土工膜作为堤身防渗体的可行性和必要性，，本文以滦河生态防洪工程迁安市段左岸防洪堤堤身的典型断面为例进行研究分析。本文首先详细地介绍了复合土工膜在国内外应用的现状，滦河生态防洪工程的基本概况；概括了复合土工膜的基本概念及主要特性，并揭示了其在工程应用中的防渗机理；总结了滦河迁安市段工程中堤坝的防渗形式与结构形式；研究了复合土工膜的施工工艺、施工要点，形成了复合土工膜完整的施工技术体系；同时对复合土工膜的不足之处进行了总结，为以后的工程建设提供了借鉴；简述了渗流的基本概念、有限元法的基本原理与基本步骤、二维稳定渗流有限元控制方程，为文中滦河工程迁安市段渗流稳定性分析奠定了理论基础。最后本文对滦河生态防洪工程防洪堤堤身及堤防背水坡进行了渗流分析及稳定性分析,采用经验公式法进行了计算,并与工程实际测量数据进行了对比,证明经验公式在理论上存在误差，所以在实际计算时，需要进行相应的误差分析。通过建立试验模型验证了复合土工膜的防渗效果；借助有限元分析软件Autobank6.0，通过选取典型断面，计算并绘制了二维有限元渗流模拟单元网格剖面图、渗透比降彩色云图及分布图、渗透流速彩色云图及流速矢量图、压力及总压力水头彩色云图等等，验证了其在工程中的可行性和有效性，为复合土工膜在我国水利工程建设的发展提供了科学依据和技术支撑。对本文的工作做简单的总结，并对复合土工膜的相关研究提出了展望。
[Abstract]:As a new type of impervious material, composite geomembrane is widely used in dike channel engineering, water conservancy and hydropower project, reservoir reinforcement and seepage prevention project, etc. And good economic and social benefits have been obtained. The composite geomembrane uses plastic film as the impervious base material, and compounding with non-woven fabric, its impermeability mainly depends on the impermeability of plastic film. However, the anti-seepage property of the composite geomembrane is mainly determined by the impervious property of the plastic film. At present, there is a lack of systematic theoretical study on the anti-seepage mechanism and anti-seepage effect of composite geomembrane, and the design and application of anti-seepage body of composite geomembrane are still confined to semi-empirical and semi-theoretical state. In the ecological flood control project of Qianan section of Luanhe River, a large number of composite geomembranes are used. In order to quantitatively analyze the feasibility and necessity of the composite geomembrane as the impervious body of embankment, the composite geomembrane is used in the seepage control body of flood prevention embankment and plays a significant role in preventing seepage and protection. This paper takes the typical section of levee on left bank of Qianan City Section of Luanhe River Ecological Flood Control Project as an example to study and analyze. In this paper, the present situation of the application of composite geomembrane at home and abroad and the basic situation of ecological flood control engineering in Luanhe River are introduced in detail, the basic concept and main characteristics of composite geomembrane are summarized, and the anti-seepage mechanism of composite geomembrane in engineering application is revealed. This paper summarizes the seepage prevention form and structure form of dyke in Qianan section of Luanhe River, studies the construction technology and key points of composite geomembrane, and forms a complete construction technical system of composite geomembrane. At the same time, the shortcomings of composite geomembrane are summarized, which can be used for reference in the future engineering construction, and the basic concept of seepage, the basic principle and steps of finite element method, the control equation of two-dimensional steady seepage finite element method are briefly described. It lays a theoretical foundation for the stability analysis of seepage in Qianan section of Luanhe River Project. Finally, the seepage analysis and stability analysis of the levee and the back slope of the levee in Luanhe River ecological flood control project are carried out. The empirical formula method is used to calculate the seepage and stability of the levee, and the results are compared with the actual measured data. It is proved that the empirical formula has errors in theory, so it is necessary to carry out the corresponding error analysis in practical calculation. The anti-seepage effect of the composite geomembrane is verified by establishing the experimental model, and the typical section is selected by means of the finite element analysis software Autobank6.0. The two dimensional finite element seepage simulation cell grid section, the color cloud map and distribution map of seepage ratio drop, the color cloud image of permeation velocity and velocity vector map, the color cloud image of pressure and total pressure water head, etc., are calculated and drawn. The feasibility and effectiveness of the composite geomembrane in water conservancy project are verified, and the scientific basis and technical support are provided for the development of composite geomembrane in water conservancy engineering construction in China. The prospect of the research on the composite geomembrane is put forward.
【学位授予单位】：河北农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV87;TV49

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