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在提出特高拱坝悬臂高度个性化控制概念的基础上,进一步给出特高拱坝施工期全坝段个性化悬臂高度控制的数值分析方法。以国内在建的某特高拱坝为例,考虑自重荷载、温度荷载、混凝土自身体积变形与徐变等因素影响,采用三维有限元方法对其进行仿真分析,研究了不同坝段在不同灌浆高程情况下的最大主应力极值随悬臂高度增加而变化的规律,并给出应力标准控制值下的全坝段悬臂高度控制值分布示意图。研究成果表明:大坝不同部位的悬臂控制高度未呈现可循规律,须实行个性化控制。悬臂高度个性化控制有利于优化施工进度,缩短施工工期,从而按计划实现坝体挡水度汛及预期发电等关键目标。
Based on the concept of personalized control of cantilever height of UHV arch dam, the numerical analysis method of individualized cantilever height control for full dam of UHV arch dam is given. Taking a special high arch dam under construction in China as an example, considering the influence of self-weight load, temperature load, concrete deformation and creep, the three-dimensional finite element method is used to simulate and analyze the influence of different dam sections on different grouting The maximum principal stress in the elevation case changes with the increase of the cantilever height, and gives the schematic diagram of the distribution of the cantilever height control values under the stress standard control value. The research results show that the height of the cantilever control in different parts of the dam does not appear to follow the rule, and the individual control should be implemented. Cantilever height individualized control is conducive to optimizing the construction progress, shorten the construction period, which plans to achieve dam flood water and expected power generation and other key objectives.