面板坝次堆石区力学特性对坝体变形协调的影响

Effects of Mechanical Characteristics on Deformation Coordination of the Secondary Rock-fill Area for A Concrete Faced Rock-fill Dam

以厦门抽水蓄能电站上水库面板堆石坝为研究对象,采用三维非线性有限元法和邓肯E-B模型,设计多组不同力学特性的主次堆石料组合,对比分析坝体变形及面板位移,探究蓄水期坝体各部位变形受堆石材料性能变化的影响程度。建议面板堆石坝主次堆石区变形协调的变形梯度极限指标为3%,同时以地震永久变形量作为抗震校核的指标。对于该工程,在现有填筑料的基础上,适当提高次堆石料力学性能,坝体坝轴线下游侧水平及垂直位移均显著降低,位移的极值部位向坝轴线靠近,高程略有上升;次堆石料的变形模量对面板的挠度影响不大。

This paper takes the CFRD of Xiamen Pumped Storage Power Station as the research object.The threedimensional non-linear finite element method and Duncan E-B model was used to designed several groups of different primary and secondary rock-fill materials with different mechanical characteristics.The deformation of dam body and the displacement of face slab were comparative analysis to explore the impact of rock-fill materials performance on the deformation of dam body parts during storage period.It is suggested that the limit index of the deformation gradient of rock-fill body in CFRD set up 3%.At the same time,the earthquake permanent deformation was taken as the index of seismic check.On the basis of existing filling materials,the horizontal and vertical displacements of the downstream side of the dam axis are significantly reduced by properly improving the mechanical properties of the secondary rock-fill materials.The extreme displacement locates closer to the dam axis,and its elevation increases slightly.The deformation modulus of the secondary rock-fill has little impactt on the deflection of the face slab.