复合土工膜心墙堆石坝应力变形研究-水利水电工程专业论文.docxVIP

兰州 兰州交通大学硕士学位论文 复合 复合土工膜心墙堆石坝应力变形分析 万方数据 万方数据 万方数据 万方数据 Abstract The composited geomembrane core wall rock-fill dam is one of the important dam types in hydraulic structures , because it has many features such as obtaining easily damming materials, simply mechanized construction, short construction period, low cost and so on and the composited geomembrane core wall has many advantages, such as good capacity adapting to the deformation, acid and alkali resistance , anti- erosion , anti-aging , anti-seepage performance, etal. So far it has been widely used in water conservancy and hydropower projects . However, the problem of stress deformation of composited geomembrane core wall rock-fill dam will also become a core issue of its design and construction. This paper describes briefly the characteristics of rock-fill dam and research status of geomembrane impervious body . According to the previous studies results ,comparing to select Duncan-Chang E ??B model as the constitutive model of rock-fill body, the composited geomembrane and contact surface are simulated by geotextile grid cell and Goodman unit, and demonstrating the application of modal response spectrum method in rock-fill dam seismic response analysis. Based on the soil theory and traditional finite element method, the paper takes some composited geomembrane core wall rock-fill dam in Bailongjiang as an example, building a three-dimensional finite element model and combining with MIDAS / GTS large geotechnical analysis software, the stress deformation of composited geomembrane core wall rock-fill dam is simulated under three kinds of conditions which are the completion period, normal storage period and normal storage period with 8 degrees earthquake, the stress deformation laws of the dam are calculated under no circumstances membrane ,and analyzing the stress deformation effect of composited geomembrane on dam. By analyzing the results: in the completion period, the stress and deformation of dam