混凝土防渗墙在土石坝加固中的应用研究

【作者】 李景龙；

【导师】 马秀媛；

【作者基本信息】 山东大学 ， 岩土与结构工程， 2005， 硕士

【摘要】 近年来,国家为了水库的防洪安全,利用国债资金进行水库除险加固。据调查,在水库坝体坝基防渗加固中,混凝土防渗墙加固技术是一项比较有效、应用比较广泛的技术。 虽然混凝土防渗墙技术在工程上得到广泛应用,但混凝土防渗墙的设计和理论研究还很不成熟,在多年的工程运用中,也暴露出了许多问题。坝体与防渗墙之间的变形协调问题及坝坡稳定性问题是诸多存在问题中较突出的问题,为此必须引起人们的重视,有必要进行有关的研究工作,从理论上阐明坝体与墙体之间的工作机理及相互影响,提出解决问题的办法。 本文通过文献查询和现场调研,对坝体中混凝土防渗墙的应用状况进行了一个客观的总结、评价,对存在的问题有一个全面了解。 本文以某均质土坝加固为工程背景,建立数学模型,采用数值方法对采用混凝土连续墙加固及运行后的情况进行分析模拟。模拟工程蓄水后渗流场的变化对坝体应力、位移等方面的影响,定量的给出防渗墙和土体协调变形情况及坝体在加固后的稳定情况,为评价工程加固效果提供了参考。 结合坝体蓄水后不同水位条件下坝体浸润线的变化,分析模拟水位的变化对坝体稳定性和变形等方面的影响。 初步分析了塑性混凝土防渗墙在运行期的受力和位移情况,比较了不同弹模下的混凝土防渗墙的应力变形以及与周围土体协调变形情况。 通过数值模拟分析结果与实际工程中出现的现象相结合,得出一些具有普遍意义的结论,为混凝土防渗墙加固工程的施工提供参考,为工程稳定性及防渗墙加固效果的评价提供理论依据,为混凝土防渗墙加固技术在同类工程中的推广应用提供参考。更多还原

【Abstract】 In recent years, our government make use of national debt to reinforce sick dams in order to ensure their safety. According to investigation, technology of reinforcement of concrete anti-seepage wall is an effective and widely applied reinforcement method in the field of dam reinforcement.Though concrete anti-seepage wall is applied widely in the engineering, its design and theory research are still not mature, and there are many problems in the applications .It is the most outstanding in all of them that are the safety of the dam and the harmonious distortion between dam and concrete wall. Therefore, it is necessary to carry out theoretical research to find out their working mechanism and mutual influence, and then put forward the resolvent.Through literature research and in-situ investigation, there are the objective summarization to the applications of the dam.Based on the reforcement to the homogeneous earth dam, in this paper theconstruction process of the dam is simulated numerically, which provides reference to the quantitative analyses of the reinforcement construction and the stability of the dam. Use the coupled fluid-solid analysis to simulate the change of the seepage field after storing water. Then determine the stability of the dam during operation after the splitting grouting, thereby provide reference to the estimation of the reinforcement result.Combining the different water level in the dam after used, primarily analyze the influence on the stress in the dam produced by the changing of water level.Analyze the stress and displacement of the plastic concrete wall in the dam, and compare difference of the stress and displacement of the plastic concrete anti-seepage wall and harmonious distortion when the elastic modulus varies.Through comparing the in-situ phenomenon and numerical simulation analysis results, we can draw some universal conclusions. These conclusions provide instruction to the construction of the concrete anti-seepage wall construction, providetheoretical base to the stability of the dam and the reinforcement effect of the technique of concrete anti-seepage wall, and provide reference to the popularization of the anti-seepage wall reinforcement technique in this kind of engineering.更多还原