摘要
针对重力坝各坝段协同作用及非线性模型对重力坝工作性态影响的问题,依托于某一实际工程设计资料,建立该重力坝的全坝段非线性有限元模型,并在计算中考虑地基与坝体协同变形,坝体混凝土材料的非线性及坝体与建基面的接触非线性对计算结果的影响。在计算的两种工况下的坝体主应力与坝体变形分布情况类似,河床坝段最大主拉应力与最大主压应力出现区域均在坝趾部位,而岸坡坝段坝趾部位主拉应力水平较高,坝踵部位主压应力水平较高。坝体最大顺河向位移出现在溢流坝段坝顶部位,最小顺河向位移出现在岸坡坝段坝体上部与两岸坝肩交界处。河床坝段及岸坡坝段应力位移计算结果对比发现,重力坝岸坡坝段与河床坝段应力变形分布规律有很大不同,将重力坝整体建立全坝段三维模型进行计算,更符合实际情况。
Aiming at the problem of the interaction of the gravity dam sections and the influence of the nonlinear model on the working behavior of the gravity dam. Based on the design data of a practical project, the nonlinear finite element model of the whole dam section of the gravity dam is established, and the effects of the coordinated deformation of the foundation and the dam body, the nonlinearity of the dam concrete material and the contact nonlinearity between the dam body and the foundation surface on the calculation results are considered in the calculation. The distribution of the dam body principal stress and dam body deformation under the two calculated working conditions are similar. The maximum principal tensile stress and maximum principal compressive stress of the riverbed dam section occur at the dam toe, while the principal tensile stress level at the dam toe of the bank slope dam section is higher, and the principal compressive stress level at the dam heel is higher. The maximum along river displacement of the dam body occurs at the crest of the overflow dam section, and the minimum along river displacement occurs at the junction of the upper part of the dam body of the bank slope dam section and the dam abutments on both banks. By comparing the stress and displacement calculation results of the riverbed dam section and the bank slope dam section, it is found that the stress and deformation distribution laws of the gravity dam bank slope dam section and the riverbed dam section are very different. It is more in line with the actual situation to establish a three-dimensional model of the whole dam section for calculation.
作者
李伟康
廖文来
杜承霖
蔡杰龙
蔡灿旭
LI Weikang;LIAO Wenlai;DU Chenglin;CAI Jielong;CAI Canxu(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong New Materials and Structure Engineering Technology Research Center,Guangzhou 510635,China;Guangdong Province Key Scientific Research Base,Guangzhou 510635,China)
出处
《广东水利水电》
2023年第1期23-29,共7页
Guangdong Water Resources and Hydropower
关键词
重力坝
全坝段
非线性分析
数值模拟
工作性态
gravity dam
whole dam section
nonlinear analysis
numerical simulation
working behavior
