大孔口拱坝工作性态研究

拱坝坝身开设大孔口对拱坝工作性态影响较大,对此,根据某坝身开设大尺寸泄洪孔的拱坝初设体型,建立了可反映坝址地形地质条件的有限元模型,研究了该拱坝初设体型、无联系梁及拱坝加高3种方案下的应力分布规律,并对坝基面进行等效应力处理。结果表明,联系梁完全失去作用时坝体仍能安全运行,拱圈加高后对减小坝体应力无显著效果,初设体型在等效处理后的应力大小满足规范要求,证明了该拱坝的初设体型的设计合理性,为工程的后期建设和安全运行提供了指导。

Study on Working Behavior of Arch Dam with Large Orifices

The orifices in the arch dam have a great influence on the behavior of arch dam. According to the initial body design of a given arch dam with large orifices, the finite element model is established, which can reflect the topographic and geological condition of the dam site area. The stress distribution law is analyzed under three schemes: the initial body design, heightening the dam crest, without coupling beam. And then the equivalent stress method is supplemented for the dam foundation surface. The result indicates that the stress distribution of the initial body design meets standard requirements. However, the maximum tensile stress changes little after heightening the dam crest and the arch dam can still work without coupling beam, which proves the arch dam profile design reasonable. Thus, it provides guidance for the construction at later stage and safe operation of the project.