贴坡型混凝土面板堆石坝三维非线性分析

3-D nonlinear analysis of fitting-slope concrete-face rockfill dam

利用堆石坝对地形条件适应性强的优势,将混凝土面板堆石坝设计建于条形山脊上,依天然坡面分别贴岩坡填筑堆石料,使原山体成为坝体一部分而形成的混凝土面板堆石坝,称之为贴坡型混凝土面板堆石坝。利用目前应用较为广泛的邓肯E-B模型,基于ABAQUS提供的2次开发用户子程序,对某贴坡型混凝土面板堆石坝施工填筑期和水库蓄水运行期的应力与变形进行模拟分析。计算结果表明,受地形和岩坡开挖形态的影响,贴坡型混凝土面板堆石坝的坝体变形规律与常规混凝土面板堆石坝有较大的不同,坝体沉降、水平位移以及面板的变形都较小;阶梯状的建基面凸角处有明显的应力集中,相应部位的应力水平较高。计算成果可为优化设计提供合理的建议和有效的措施。

Using rock-fill dam’adaptable predominance over topographical condition,a concrete-face rockfill dam(CFRD)designed to build on the strip dorsum is filled fitting the natural side;and it makes the original massif be parts of the dam body;thus a fairly rare CFRD was achieved,which is called fitting-slope CFRD.The widespread Duncan-Chang E-B model is applied to analyze simulatively the stress and deformation of one fitting-slope CFRD for construction and operation periods respectively by using User Subroutine of ABAQUS.The result indicates that the fitting-slope CFRD differs from ordinary CFRD in deformation;the fitting-slope CFRD shows small settlement and horizontal displacement and deformation of concrete face,which is affected by ledge excavation;convex angle of plane of foundation of echelonment exists obviousl stress concentration,where the stress level are high.The result of calculation can supply rational advices and effective measures for optimizing design.