高混凝土面板堆石坝流变机理及长期变形预测

Study on creep mechanism and long-term deformation prediction for high concrete face rockfill dam

对于面板堆石坝,面板的变形主要取决于堆石体变形,如果堆石体变形过大,就会使面板产生裂缝,从而影响其防渗性能,甚至危及坝体的稳定。由于堆石体流变变形的复杂性,影响的因素很多,因此仅仅通过室内试验很难从本质上反映其流变机理和特性,除了试样尺寸与现场的巨大差异引起的缩尺效应误差之外,就是平行试验成果间也会出现差异。回顾了近年来关于堆石体流变机理方面的一些研究进展,介绍了揭示堆石体流变细观机理的两个流变模型,即基于组构理论的流变模型和基于随机散粒体不连续变形理论的流变模型。最后结合正在建设中的水布垭高面板堆石坝进行了流变分析,预测了大坝完建后的流变变形,计算结果表明,考虑流变效应的最大沉降为2.53m,此值基本处在设计的预测范围之内。

The deformation of concrete face mainly depends on the deformation of rockfill for the concrete face rockfill dam.If the deformation of rockfill is too large,cracks will appear in the face slab,which will influence the anti-seepage performance and even the stability of the dam.Because of the complexity of the creep deformation for rockfill,and a large number of influencing factors,it is difficult in nature to reflect the creep mechanism and characteristic of rockfill only from the indoor test.Scale effect e...