摘要
针对碾压混凝土坝成层施工的结构特点及其渗流特性,笔者在非均质各向异性等效连续体模型的基础上,提出可精细而又方便地模拟大坝中层面、缝面和裂缝等渗流行为的缝面渗流平面单元模型。在没有增加计算网格结点的前提下,不但能高效率地刻画出层面和缝面所带来的坝体强渗透各向异性的特点,而且又能极容易地对那些局部零星分布的有强集中渗透能力的冷缝和裂缝等缝隙进行逐个细致地模拟,坝体的渗流实际情况在数值模型中得到了甚为客观的展现,提高了大坝渗流场的计算分析精度,基本上完整地解决了碾压混凝土坝的渗流建模问题。最后,较详细地进行了一个高102m的大坝的算例分析。
In consideration of the structural characteristics of the layerlifted construction of rollercompactedconcrete (RCC) dams and the complicated seepage properties, the authors developed an effective plan element model for fracture seepage in the dams based on anisotropic equivalent continuous model. With the new model the complicated and concentrated seepage behaviours of lift interface, lift joints and other cracks in RCC dams could be simulated easily and preciously. Under the condition without increasing the number of elements and nodes, the model can effectively deal with the anisotropy of permeability of the dams caused by the lift interfaces and joints and easily simulate the scattered discontinuities one by one. The real seepage performance of RCC dams could be reflected in the smiulation with high precise and the solutions of the seepage fields were improved. A 3D example of the seepage behavior of a 102m high RCC gravity dam with or without lift joints, fractures and drainage curtain were evaluated in detail.
出处
《水利学报》
EI
CSCD
北大核心
2003年第3期63-68,共6页
Journal of Hydraulic Engineering
基金
水利部技术开发基金资助项目(SL9705)
教育部博士点基金资助项目(97029406)
关键词
碾压混凝土坝
渗流场
缝面渗流
平面单元
缝面
roller-compacted-concrete (RCC) dam
seepage
lift interface
lift joint with bigger aperture
fractures seepage
plan element
