窄陡河谷面板堆石坝坝肩摩擦接触问题研究

本文提出陡坡峡谷地区面板堆石坝坝肩摩擦接触模型。它采用可以沿接触面滑动的支座来模拟堆石与岸坡的接触，并假定与岸坡接触的堆石结点在岸坡的法线方向固定，而在沿岸坡的切线方向可以滑移。其接触面采用刚塑性模型，当剪应力小于等于剪切破坏强度时结点固定，而当剪应力大于剪切强度时，结点在切线方向可以滑移，并受到超值摩擦力的作用。由于堆石坝的变形在建成后若干年停止，因此对岸坡与堆石体之间的接触摩擦角采用衰减模式。文中用该模型对典型面板坝进行了变形分析，并对周边缝破坏的现象做出解释，表明所提模型合理可行。

Frictional contact between abutment and CFRD in deep narrow valley

The model for describing the frictional contact between abutment and CFRD in deep narrow valley is presented. The contact between the dam and abutment is simulated as the slip of support along the contact surface. The contact nodes are assumed as fixed in the normal direction and movable in tangent direction. Rigid-plastic frictional model shows that the nodes will not slip until the shear force exceeds the frictional strength along the interface. In view of the deformation of rockfill dam will be very small in several years after the completion, the friction angle between abutment and dam is expressed by an attenuation mode. The FEM analysis of typical CFRD shows that this frictional model can well describe the failure process of peripheral joints.