考虑堆石体流变效应的高面板坝最优施工程序研究

考虑高面板坝堆石体的流变变形效应对堆石体的最优施工碾压进度方案进行了研究。结果表明,堆石体的本身流变变形特性对不同施工碾压进度方案下的面板垫层变形影响较大。堆石坝不同材料分区的特点从客观上决定了高堆石坝必然存在一个较优的施工填筑上升方案。堆石体均匀上升的填筑进度方案的面板垫层法向最大位移较小,且沿面板坡向的分布比较均匀,对面板与垫层间的协调变形有利。从最优填筑方案的角度来看,建议高堆石坝采用均匀上升的碾压施工程序。

A study of optimal construction scheme of high concrete face rockfill dam in consideration of rockfill creep effect

Optimal construction scheme of high concrete face rockfill dam(CFRD) is studied taking into account creep deformation of rockfill.The results show that creep characteristic of rockfill influence on deformation of dam bedding node under different construction schemes.The zone by zone character of various materials of a rockfill dam decides objectively the necessary existence of an optimal scheme for the construction of filling ascension works.The maximum normal displacement of the facial slab is small in the filling.Scheme where the rock-filling body ascends uniformly and its distribution along the slab slope is also rather uniform,which is favourable to the harmony between the deformations of slab and pad layer beneath it.From the view of the majorized filling scheme,it is suggested that the rolling and compacting construction procedure producing uniform ascension of filling shall be used for high rockfill dams.