【作者】 王曙光；

【导师】 王铁成；

【作者基本信息】 天津大学 ， 结构工程， 2006， 硕士

【摘要】 渗流问题是土石坝中的常见问题,严重时影响水库的安全运行,高压旋喷混凝土地下连续墙施工简单、造价低,在土石坝防渗加固工程中有着广泛应用。目前我国病险水库普遍存在渗流问题,对已建水库加固效果的评价研究也很少,因此,对土石坝渗流问题以及防渗加固效果的研究有重要意义。基于二维饱和-非饱和渗流的基本方程,应用伽辽金法对其进行了离散,得到有限元控制方程。采用用有限元软件SEEP/W对二维饱和-非饱和渗流进行数值模拟,分析了土石坝采用地下连续墙加固后的防渗加固效果。本文研究了影响土石坝渗流的各种因素,引入饱和-非饱和渗流的基本方程,应用有限元软件SEEP/W对某水库采用高压旋喷混凝土地下连续墙全封闭加固后的防渗效果进行了数值模拟,分别分析了防渗墙、水库、坝体及基础土体性质对渗流的影响,研究结果表明,在对已建水库的防渗加固工程中,防渗墙的施工质量对防渗效果影响最大,库水位变动和绕渗对防渗效果也有一定影响。以某水库防渗加固工程的效果为例,分析了影响土石坝防渗加固的各种因素,为我国病险水库防渗加固提供参考。更多还原

【Abstract】 Seepage is a common problem of earth and rockfill dams, it is harmful to the safety of the dam when the seepage is serious. The high pressure circular jet grouting diaphragm wall is popular in seepage reinforcement engineering of earth and rockfill dams because it is chip and easy to build. At present, the damaged dams always have the seepage problem, and the research about the estimate of the seepage reinforcement, so it is essential to study the seepage problem of earth and rockfill dam and the estimate of the seepage reinforcement.A FEM (Finite Element Method) governing equation for 2-D saturated and unsaturated seepage problem, based on basic seepage equation, is presented by applying Galerkin Method and can be applied in simulating 2-D seepage problems. In anglicizing the reinforced earth and rockfill dams by underground diaphragm wall, the software SEEP/W is used.In this paper, each factor which affects seepage of earth and rockfill dam is comprehensive analyzed, using the saturated and unsaturated basic seepage equation. The seepage reinforcement engineering of reservoir reinforced by underground diaphragm wall are simulated using the FEM software SEEP/W, the effects of impermeable wall, reservoir itself and dam and foundation are analyzed. It is indicated that the construction quality of the wall is most affected the reinforcement, water level is also a significant factor from the results.Each factor which affects seepage of earth and rockfill dam is analyzed; the result can be used for reinforcement of other disease dams.更多还原