摘要
以公伯峡面板堆石坝为例,分析了面板出现裂缝的非常工况下的渗流场,以探讨裂缝对大坝渗流场和渗透稳定性的影响。根据大坝设计剖面和地形剖面剖分网格,采用固定网格有限元全场渗流分析方法,计算了堆石坝防渗结构发生水平或竖向裂缝非常工况下大坝渗流场和渗流量。计算结果表明,基岩上部弱透水层的渗透性对大坝渗流场具有重要影响;面板附近垫层过渡料区中出现较大的渗透坡降,但随着离裂缝距离的增加较快衰减;裂缝的方位和宽度对渗流量和其附近的垫层过渡料区的渗流场有较大影响。
The seepage field and stability of the concrete-faced rockfill dam (CFRD) in Gongboxia Hydropower Project, when cracks are occurred to the face plate, are analyzed. The computation meshes are generated according to the designed section graph and topographic map. A 3-D fixed-mesh FEM is applied to adapt the conditions of horizontal or vertical cracks. The flow field and seepage discharges in cases of different crack widths and orientations are obtained. The analysis results show that the permeability of bed rock may greatly affect the flow fields and the seepage gradient in the padding zone near the crack is high, but it will decrease rapidly with the increase of distance from the crack. The orientation and size of the crack are the major factors affecting the flow field in the padding zone near the crack.
出处
《水利学报》
EI
CSCD
北大核心
2005年第4期420-425,共6页
Journal of Hydraulic Engineering
关键词
公伯峡
渗流
有限元
面板堆石坝
裂缝
宽度
方位
Gongboxia Hydropower Project
FEM
seepage analysis
concrete-faced rockfill dam (CFRD)
crack
width
orientation.
