面板堆石坝垂直缝破坏下三维渗流场有限元模拟

Seepage field 3D finite element simulation of concrete faced rockfill dam under failure condition of vertical fracture

采用改进节点虚流量法求解无压稳定渗流场,并引入无厚度的裂缝模型对破坏的垂直缝渗流行为进行模拟,得到面板堆石坝裂缝渗流问题的有限元分析方法,并编制Fortran程序。以某混凝土面板堆石坝为例,计算了面板单一垂直缝破坏和多条垂直缝破坏条件下的三维渗流场,得到不同条件下渗流场的水头分布、浸润线以及渗漏量,系统分析了面板堆石坝在垂直缝破坏条件下的稳定渗流场规律和特点。结果表明,该方法能对渗流逸出点和浸润线进行准确定位,还能很好地模拟面板垂直缝破坏对坝区渗流场的影响,可以为面板堆石坝的接缝设计提供参考。

The improved node virtual flow method is used to solve unconfined seepage field;and the damage vertical flow behavior is simulated by zero thickness crack model;and then the finite element method of crack seepage problem of the concrete faced rockfill dam（CFRD） is obtained.Based on a CFRD,the program composition with Fortran was used to calculate the 3D seepage field under the failure condition of the single or more than one vertical fracture of concrete slab;and the water head distribution,saturation line and leakage are obtained;and then the rules and characteristics of unconfined seepage field are analyzed.The results show that the method can accurately position exit point and saturation line of seepage field of CFRD,and well simulate seepage field in dam area under the failure condition of vertical fracture of concrete slab so as to provide reference for concrete face jointing design of CFRD.