三板溪面板堆石坝流变特性及面板脱空效应

Rheological Characteristics and Face Slab’s Disengagement of Sanbanxi Concrete Face Rockfill Dam

为深入分析高面板堆石坝的空间流变特性及面板脱空现象,提出了基于接触面单元变形分析的面板脱空计算方法,基于FLAC3D平台二次开发了面板堆石坝三维静力和流变特性同步分析的计算程序,并对脱空算法和程序进行了验证。针对三板溪面板堆石坝变形及脱空问题,采用二次开发的程序分析了坝体变形的时空分布规律和面板脱空特性,得到了坝体变形空间分布,明确了面板脱空位置分布及脱空值。研究成果表明:坝体流变效应在空间上呈现出显著的不均匀分布特点,坝体流变效应将加剧面板的脱空程度,并有可能引起出现新的脱空区域。

A method of computing the disengagement of concrete face slab is proposed based on contact element deformation analysis to deeply understand the spatial rheological characteristics and disengagement of face slab of high concrete face rockfill dam(CFRD).The computation program of 3D static and rheological analysis for CFRD is developed using FLAC3D platform,and the computation method and program are verified through computation case of Sanbanxi CFRD.The temporal and spatial distribution of the deformation and face slab’s disengaged distance of Sanbanxi CFRD are analyzed by using the proposed method,and the positions and values of face slab’s disengagement are determined.The research findings suggest that the rheological effect of dam body is obviously unevenly distributed in space,which aggravates the disengagement of concrete slab and may cause new void areas under the concrete slab.