【摘要】 本文分别采用沈珠江双屈服面弹塑性模型和清华弹塑性损伤模型描述堆石料和土与结构接触面,采用三维有限元分析方法计算了不同河谷宽高比时大坝的应力和位移。结果表明河谷地形对于大坝应力和位移特性有显著影响。河谷宽高比减小后,坝基对坝体的约束作用加强,导致:(1)坝体的变形减小;(2)面板的挠度随之减小;(3)面板顺坡向应力出现了拉应力从而增大了面板出现拉裂缝的可能性;(4)面板顺坝轴向拉应力减小,顺坝轴向压应力则出现先减小后增大的趋势;(5)面板周边缝张开量明显减小。更多还原

【Abstract】 The 3-dimensional finite element method is used to analyze the effect of foundation topography on the stress and displacement response of concrete faced rockfill dam,the behavior of rockfill and the soil-structure interface are described by using Shen’s twoyield surfaces model and the Tsinghua elasto-plasticity damage model respectively in this paper.The analysis results show that the foundation topography has a significant effect on the stress and displacement response of the dam.The restriction of the foundation on the dam increases with decreasing the width-height ratio of the valley;it leads to the following consequences:(1) the deformation of dam body decreases significantly;(2) the deflection of face-slab decreases consequently;(3) the slope-direction tensile stress occurs in the face slab,it increases the possibility of tensile cracks;(4) the tensile axial stress of the face slab decreases but the compressive axial stress firstly decreases and then increases later;(5) the open displacements of the peripheral joints of slabs decrease significantly.更多还原