自重施加模拟方式对高拱坝工作性能的影响

为研究拱坝的不同自重施加方式对高拱坝的应力变形的影响,结合溪洛渡高拱坝实例,采取七种不同自重施加模拟方案,研究混凝土高拱坝在不同自重加载过程条件下对坝体结构工作状态的影响。有限元分析结果表明:受分步分块体形和自重累计影响,不同的自重施加模拟方式对拱坝的应力场与位移场的影响比较大,随着自重施加步数增多,仿真结果更为合理,水平拱向分层次数较竖直分缝数目对坝体性能影响更为明显,其中坝体的主拉应力和横河床方向位移变化最为敏感,分析成果对拱坝设计施工以及安全控制指标有一定的参考价值。

Influence of different loading processes of self-weight on performance of arch dam

In order to study the influence of different loading process of self-weight on stress and displacement of the arch dam,the Xiluodu dam was taken as the research object.Seven different loading processes of self-weight of the dam were simulated to analyze the influence on the working state of the arch dam.The results of finite element analysis showed that the different loading process had a significant effect on the stress field and displacement field of the arch dam because of the arc shape of blocks and the accumulation of self-weight.With the increase of applied self-weight,the simulation results were getting more reasonable.The effect of the number of horizontal hierarchical level played a more important role than that of the vertical counterpart.Especially,the changes of principal tensile stress of the dam and displacement along cross-bed direction appeared more sensitive.The analysis results have some reference value for design and construction of arch dam.