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为研究双曲拱坝坝体开孔对其整体静力、动力特性的影响,笔者结合实际工程,进行了在静荷载及地震等不同荷载条件下的有限元及光弹性试验。结果表明,坝面开孔率在3.5%以下时,(1)由于拱圈刚度被削弱,拱梁应力会发生重分布,但变化值不大,基本规律与不开孔情况相近;(2)在综合静荷载作用下,位移增大约15~20%,产生一定影响,但应力最大值变化很小;(3)在地震烈度为8度的情况下,位移增长小于10%,梁应力最大值增长约10%,拱应力最大值略有减少。总的说来,开孔对坝体静力、动力特性的影响不大。
In order to study the influence of the dam opening of the double-curvature arch dam on the overall static and dynamic characteristics of the dam, the author carried out the finite element analysis and the photoelastic test under static and dynamic load with the actual project. The results show that the stress of the arch beam will be redistributed due to the weakened rigidity of the arch ring when the opening ratio of the dam surface is below 3.5%. (2) When the seismic intensity is 8 degrees, the displacement increase is less than 10%, and the maximum value of beam stress An increase of about 10%, a slight decrease in the maximum arch stress. In general, the hole has little effect on the static and dynamic characteristics of the dam.