鱼跳混凝土面板堆石坝三维静力应力变形分析

采用邓肯模型对鱼跳面板堆石坝进行了三维有限元分析,研究软岩填筑层对坝体工作性能的影响,计算了混凝土面板与岩石填筑层的位移和应力及周边缝变形。结果表明:由于受到下游软岩填筑区的影响,坝体最大横断面最大沉降略偏向下游,总沉降量约为坝高的1%。面板周边缝位移的绝对值一般都小于2cm,周边缝的止水设计需注意选择合理的止水形式和填缝材料。由于坝址河谷狭窄,受岸坡约束,三维效应对坝体的应力变形影响较明显,计算结果与原型观测数值相一致。

3-D static stress and displacement analysis of the Yutiao concrete faced rockfill dam

The authors performed a 3-D finite element analysis by applying Duncan model to evaluate stresses and deformations of the concrete-faced rock-fill dam of the Yutiao project. The effects of soft rock fillings on the behavior of the dam were discussed. The displacements and stresses of concrete slab and rock fillings as well as deformations of peripheral joints were calculated. The maximum settlement of the cross section was found to be located at the downstream side with a value corresponding to 1% of the dam height. The displacement of peripheral slab joints was small, less than 2.0cm during reservoir impounding. The type of watertight and joint sealing material should be selected carefully. The effect of the 3-D characteristics of canyon shape on the behavior of CFRD was found to be signifincant. The computed results by the present method were found to be in good agreement with the prototype measured values.