拱坝大表孔对坝体位移影响的三维有限元分析

Three dimensional finite element analysis of influence of large surface hole on displacement of arch dam

在拱坝的坝身开设大表孔可以有效解决泄洪和取水问题,是拱坝设计的常见形式。文中以官山水库的拱坝为例,利用ANSYS三维有限元软件建立数学模型,对未开设表孔、开设宽浅型大型表孔和开设窄深型大型表孔进行对比分析。结论显示,在两种最不利工况下拱坝开设大表孔情况下,最大位移位置有所变化,位移量有一定增大,但总体上对坝体位移的分布规律影响较小,而宽浅型和窄深型大表孔对坝体位移产生的影响之间也不存在显著区别。

The construction of large surface holes in the dam body of arch dams can effectively solve the problems of flood discharge and water intake, and is a common form of arch dam design. Taking the arch dam of the Guanshan reservoir as an example, the mathematical model is built by using the ANSYS three-dimensional finite element software to compare and analysis the no surface hole, the wide and shallow type large surface hole and the narrow and deep type large surface hole. The results show that, under the two most unfavorable conditions, the maximum displacement position has some change and the displacement has a certain increase for the arch dam with the large surface holes, but on the whole it has little influence on the distribution law of the dam displacement, and there is no significant difference for the dam body displacement between the wide and shallow type and the narrow and deep type large surface holes.