摘要
混凝土面板的薄板结构特性以及计算成本的控制需要,导致面板模拟精度相比面板复杂的工作条件、结构重要性而言过于粗糙,严重影响数值模拟计算的可靠性。【目的】为了实现面板的精细化模拟,【方法】通过在面板堆石坝的有限元计算中引入六面体任意节点单元,开发了一种混凝土面板堆石坝跨尺度有限元模拟技术,采用该技术对某面板堆石坝进行数值模拟,并与常规有限元模拟结果进行对比。【结果】结果显示,采用跨尺度精细化模拟技术,面板拉、压应力均有显著增大趋势,其中水平向压应力和顺坡向拉、压应力的增幅分别达到10%、40%和70%左右,两岸局部水平向拉应力甚至出现8倍以上增幅;沿面板厚度方向应力、变形也显示出压应力向表层发展、拉应力及结构缝张开度向底部发展的现象,尤其是顺坡向拉应力,表层、底层拉应力比值超过2.0;计算结果与面板堆石坝实际运行表现相互吻合。【结论】对比研究表明,跨尺度模拟技术不仅可以精细地反映单块面板的应力变化、接缝位移变化,而且可以反映面板变形与应力沿厚度方向的变化规律,为复杂面板堆石坝结构设计提供了更加可靠的依据。该技术计算效率、模拟精度高,具有很大的推广应用价值。
The thin plate structural characteristics of the concrete panel and the need to control the calculation cost lead to the panel simulation accuracy being too rough compared with the complex working conditions and structural importance of the panel, which seriously affects the reliability of the numerical simulation calculation. [Objective] In order to realize the refined simulation of the concrete face slab of concrete face rockfill dam, [Methods] a transscale finite element simulation technique is developed through introducing arbitrary-node hexahedron element into the finite element calculation of the concrete face rockfill dam, and then this technique is used to make a numerical simulation of a concrete face rockfill dam and the result is compared with that of the conventional finite element simulation. [Results] The result shows that both tensile stress and compressive stress of the concrete face slab significantly increase, in which the increasing amplitudes of the horizontal compressive stress and the tensile stress and compressive stress along the slope reach about 10%, 40% and 70% respectively, while the local horizontal tensile stresses on both the banks even increase by more than 8 times. The stress and deformation through-thickness direction also exhibit that the compressive stress develops toward the surface and the tensile stress and the opening of the structural joint develop toward the bottom, especially the tensile stress along slope with the tensile stress ratio between the surface layer and the bottom layer of over 2.0. The calculation result is mutually coincided with the actual operation performance of the concrete face rockfill dam. [Conclusion] Comparative studies show that, this trans-scale finite element simulation technique can not only delicately reflect the stress change and joint displacement of a single concrete face slab, but can also reflect the changing laws of the deformation and stress of the concrete slab through-thickness direction, and then can provide more reliable basis for the design of complicated structure of concrete face rockfill dam. This technology has high calculation efficiency and simulation accuracy, and has great popularization and application value.
作者
朱安龙
孙屹
张萍
徐小东
何文
冯仕能
刘斯宏
ZHU Anlong;SUN Yi;ZHANG Ping;XU Xiaodong;HE Wen;FENG Shineng;LIU Sihong(PowerChina Huadong Engineering Corporation Limited,Hangzhou 310014,Zhejiang,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第2期118-128,共11页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(U1765205,51379066)。
关键词
跨尺度
六面体任意节点单元
混凝土面板堆石坝
有限元
trans-scale
arbitrary-node hexahedron element
concrete face rockfill dam
finite element
