| 摘要: |
| 【目的】研究河谷宽高比对高面板堆石坝应力变形的影响规律，为实际工程中坝址选择、河谷地形对坝体应力变形的影响分析等提供理论依据。【方法】运用三维有限元法，分别进行了河谷宽高比为3.0，2.0，1.0等3种方案下的大坝应力变形计算，并在此基础上进行了各方案大坝应力变形的对比研究。【结果】随着河谷宽高比的减小，坝体的各项位移和应力以及面板的位移均呈逐渐减小趋势，而面板应力却逐渐增大；当河谷宽高比由 3.0 减小为2.0时，坝体应力变形最大变化率为-8.89%（坝体大主应力），面板应力变形最大变化率为22.31%（面板顺坡向压应力）；当河谷宽高比由2.0减小为1.0时，坝体应力变形最大变化率为-42.75%（左右岸坝体向河谷中心位移），面板应力变形最大变化率为54.73%（面板顺坡向压应力），可见当河谷宽高比小于2.0时，坝体及面板的上述主要应力变形项的变化率将成倍增大。【结论】在实际工程中进行坝址选择时，宜优先考虑河谷宽高比不小于2.0的坝址方案。 |
| 关键词: 河谷宽高比 高面板堆石坝 应力变形 影响规律 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（50779051） |
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| Effect of valley width/height ratio on stress deformation of rock-fill dam |
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WANG Rui-jun,LIU Wei,LU Zhi-nan
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| Abstract: |
| 【Objective】This paper investigated the influence of valley width-height ratio on stress deformation of high CFRD to provide theoretical basis for selecting dam site in practical engineering and analyzing the effects of river landform on stress deformation of dam.【Method】3-D finite element method was used to calculate the stress deformation of dams with width/height ratios of 3.0,2.0 and 1.0,and stress deformation of each scheme was compared.【Result】With the decrease of valley width/height ratio,stress and displacement of rock-fill dam and the displacement of panel decreased,while stress of the panel showed a gradually increasing trend.When the valley width/height ratio decreased from 3.0 to 2.0,the maximum change of the stress deformation of the dam was -8.89% (major principal stress of dam) and the maximum change of the stress deformation of the panel was 22.31% (downslope to compressive stress of face slab).When the valley width/height ratio decreased from 2.0 to 1.0,the maximum change of the stress deformation of the dam was -42.75% (displacement to the valley center of left and right banks dam) and the maximum change of the stress deformation of the panel was 54.73% (downslope to compressive stress of face slab).When the width/height ratio was less than 2.0,the change of main stress deformation term doubled.【Conclusion】The valley width/height ratio of no less than 2.0 was recommended. |
| Key words: ratio of valley width/height high concrete face rock-fill dam stress and deformation influence law |
