大角度折线型高面板堆石坝坝体和面板的应力与变形规律

Research on stress and deformation law of dam body and face slab of high concrete face rockfill dam with large angle broken line

为深入探索折线型高面板堆石坝的变形机理,针对某拟建水库大坝,采用有限元数值模型模拟了3个坝轴线布置方案的堆石体应力与应变、面板应力与变形及结构缝变形,分析了上述变化规律与坝轴线折角之间的非线性关系,初步探讨了大角度折线型面板堆石坝的坝体变形机理。结果表明,坝轴线转折点周边面板出现的拉应力会随着折角的增大而产生不同程度的增强;坝轴线转折处的地形条件及坝体对称性对坝体受力变形影响较大;结合地形地质条件,合理选择转折点和折角大小是折线型面板堆石坝设计的关键。

In order to further explore the deformation mechanism of high concrete face rock-fill dams with a broken line axis,a finite element numerical model was used to simulate the rockfill body stress and strain,the face slab stress and deformation as well as the structural joint deformation for a proposed reservoir dam with 3 dam axis layout plans.The nonlinear relationship between the above change rules and the dam axis angles was analyzed,and the deformation mechanism of the concrete face rockfill dam with large angle broken line axis was discussed.The results show that the tensile stress of the face slab around the turning point of the dam axis increases with the broken line angle.The topographic conditions and the symmetry of dam body at the turning point of dam axis have great influence on the stress and deformation of the dam body.Reasonable selection of the turning point and turning angle according to topographic and geological conditions is the key to design concrete face rockfill dams with broken line axis.