无单元法在堤坝防渗墙应力分析中的应用

Application of element-free method in stress analysis of cut-off wall in embankment

由于防渗墙几何形状一般为薄长条形,用常规有限元法进行分析,存在单元长宽比例过大等问题,为此将有限元法和无单元法相结合应用于堤坝及其防渗墙的应力分析。计算结果表明,无单元法能够简单、灵活地对防渗墙等薄层结构进行节点加密,能够避免有限元计算网格划分长宽比例过大的缺陷,从而改善计算精度。

Because the geometry of a cut-off wall generally is a thin long-strip,there exists a problem of deficiency of larger length-width ratio employing conventional FEM calculation. By examples, this paper introduces the element-free method coupled with FEM, which can give satisfactory results for calculation of some thin strac-tures, such as cut-off wall in embankment with simply adding nodes freely. As it can avoid the deficiency from larger length to width ratio mesh in traditional FEM, the simulating accuracy can be enhanced.