无单元法在混凝土面板堆石坝应力分析中的应用

Element-free method for stress-strain analysis of concrete face rock fill dam

常规有限元法在单元的合理划分和混凝土面板受力变形的准确计算方面有较大困难,为此该文将无单元法应用于混凝土面板堆石坝的应力分析。在几何条件或应力变化比较强烈的区域使用无单元法,而几何条件或应力变化不太大的区域使用有限元法。计算结果表明:无单元法能够简单、灵活地对混凝土面板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,从而可以改善计算精度;两种方法的耦合可以很好地发挥各自的优势。

The elementfree method (EFM) was used to calculate the stress and deformation of a concrete face rock fill dam (CFRD) rather than the traditional finite element method which has difficulty in properly separating the elements and accurately calculating the stresses and deformations. The EFM was used in regions with large geometric and stress variations while the FEM was used in regions with small geometric and stress variations. The results showed that the EFM provides better results for the CFRD and that with EFM nodes can be easily added at the concrete face to improve the simulation accuracy for elements where the length to the width ratio would be large for a traditional FEM mesh. The combination of the two methods provided better simulation results.