三峡大学学报（自然科学版）

本文对理想河谷中直线型和折线型面板堆石坝进行了分析，探讨了两种方案下面板坝的应力变形特性.在常规有限元框架中引入六面体任意结点单元作为过渡单元，实现了精细面板网格和相对稀疏坝体网格之间的跨尺度模拟，并通过算例验证了跨尺度精细化模拟方法的合理性和适用性.对比分析表明，坝轴线的折线布置会导致河床坝段坝轴向压应力减小，折线坝段坝轴向拉应力明显增大，相应部位垂直缝张开明显.通过细部分析发现面板主要存在坝轴向弯曲、顺河向弯曲和转动3种变形形式，其中面板的坝轴向弯曲会使得单块面板左右侧和内外侧应力产生差异，面板转动会导致面板垂直缝里外张开程度存在差异，在一定程度上解释了面板发生局部破坏的原因.

This paper presents a finite element analysis for the behavior of the linear and fold-line face rockfill dams in ideal valley. In this study, an arbitrary-node hexahedral element is introduced as the transition element in the conventional finite element framework to realize the cross-scale simulation between the fine panel mesh and the relatively sparse dam mesh. In addition, the effectiveness of the cross-scale refined simulation method has been numerically verified. The stress and deformation characteristics of face rockfill dams under two schemes are discussed. The comparative analysis shows that the fold line arrangement of the dam axis will lead to the decrease of the axial compressive stress of the dam in the riverbed dam section and the obvious increase of the axial tensile stress of the dam in the fold line dam section, and the vertical joints in the corresponding parts will open. The detailed analysis shows that the axial bending, deflection and rotation are three main deformation forms of the concrete face slabs. The axial bending of the dam slab will cause differences in stress on the left and right sides and the inner and outer sides of a single slab, and the rotation of the slab will lead to differences in the opening degree of the vertical joint inside and outside the slab, which to a certain extent explains the reason for the local failure of the slab.