深厚覆盖层土石围堰防渗墙结构设计研究

发布时间：2018-07-11 13:12

本文选题：深厚覆盖层 + 土石围堰　；参考：《长江科学院院报》2016年04期

【摘要】：防渗墙良好的工作性态是深厚覆盖层土石围堰正常运行的重要保障,为弄清不同材料、不同设置位置、不同结构型式防渗墙在深厚覆盖层条件下的工作性态,给在该种环境下防渗墙的结构设计提供参考,以某实际工程为研究背景,采用有限单元法,借助ABAQUS大型商用有限元计算软件,对该工程防渗墙的各种方案进行结构计算,得出了不同方案条件下防渗墙的应力、位移变形等规律。根据计算得出的规律从定性与定量2个方面对该工程防渗墙的设计方案进行了优化选择,研究表明:采用塑性混凝土防渗墙优于刚性混凝土防渗墙,前者与围堰的变形更协调,更有利于围堰的安全;防渗墙的设置位置对围堰自身的应力、位移变形影响较大,防渗墙设置离上游堰脚1/3堰底宽度的地方优于将防渗墙设置在堰轴线的地方;当一道防渗墙不能满足设计要求,可以考虑采用双防渗墙的结构型式,这种结构型式能大幅度提高围堰的安全裕度。
[Abstract]:The good working behavior of the seepage proof wall is an important guarantee for the normal operation of the deep overburden earth rock cofferdam. It provides a reference for the structural design of the seepage proof wall under the condition of different materials, different location and different structural types of seepage proof wall under the deep covering layer, and takes a practical project as the research background. The finite element method, with the help of the ABAQUS large commercial finite element calculation software, is used to calculate various schemes of the seepage proof wall of the project. The stress and displacement of the seepage proof wall under different conditions are obtained. According to the calculated rules, the design of the seepage proof wall is optimized from 2 aspects of the qualitative and quantitative aspects. The research shows that the plastic concrete impervious wall is superior to the rigid concrete impervious wall, the former is more compatible with the deformation of cofferdam, and is more conducive to the safety of the cofferdam. The location of the seepage proof wall has a great influence on the stress and displacement of the cofferdam itself, and the location of the seepage proof wall is better than the seepage proof wall set in the weir at the bottom of the 1/3 weir at the foot of the upstream weir. Where an anti-seepage wall can not meet the design requirements, the structure type of the double impervious wall can be considered. This type of structure can greatly increase the safety margin of the cofferdam.
【作者单位】：贵州省水利水电勘测设计研究院夹岩设计处;三峡大学水利与环境学院;
【基金】：湖北省教育厅科学技术研究项目(Q20131306)
【分类号】：TV223.42

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