贴坡型混凝土面板堆石坝应力变形及坝坡稳定分析

利用堆石坝对地形条件适应性强的优势,某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,形成国内比较罕见的贴坡型混凝土面板堆石坝.假设堆石料服从Duncan-Chang本构模型,采用平面非线性有限元法,预测了坝体在竣工期和蓄水期应力变形;并根据极限平衡理论和考虑堆石料的非线性强度计算了坝体稳定安全系数.全部计算结果表明: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,坝体沉降和水平位移较小,受地形和岩坡开挖形态影响较大,下游岩坡开挖成阶梯形态对降低和控制坝体沉降具有较明显的效果,可减小下游坝体滑动的趋势,对维持和提高坝体竣工和蓄水后的稳定性有利.

Analysis of stress deformation and slope stability for fitting-slope CFRD

Using rockfill dam's adaptable predominance over topographical condition,A concrete face rockfill dam(CFRD) designed to build on the strip dorsum is filled fitting the natural side,which makes the original massif to be parts of the dam body,thus a fairly rare fitting-slope CFRD in China was(achieved).On the assumption that rockfill is obedient to Duncan-Chang model,this article forecasts the stress and deformation for the dam by using 2D-NFEM.Then safety factor is calculated with limit equilibrium theory considering rock's nonlinear shear strength.The result indicates that the fitting-slope CFRD is differ from ordinary CFRD in deformation;the fitting-slope CFRD shows small settlement and small horizontal displacement and is affected by ledge excavation;the stepped downstream side can efficiently control the settlement and slipping trend,which is favorable to maintain and raise the stability.