地形不对称对白鹤滩拱坝的影响

Influence of topographical asymmetry on Baihetan Arch Dam

文章构造一对称拱坝作为对比拱坝,以白鹤滩拱坝为例,采用有限元法对拱坝的地形不对称因素进行分析。结果表明,地形不对称对白鹤滩拱坝最大顺河向位移影响不大,但对最大横河向位移有所影响。地形不对称对坝体的最大主拉应力和最大拱向正应力有一定影响,而对其它应力分量极值的影响相对较小。随着超载系数的增加,坝体有绕右坝肩作相对转动的趋势。与所拟的对称河谷对比体型相比,白鹤滩拱坝的超载能力略有降低。

In contrast with a simulated symmetrical arch dam, this paper studies the influence of topo- graphical asymmetry on Baihetan Arch Dam with finite element method. The result indicates that maximum transverse displacement of Baihetan Arch Dam occurs under topographical asymmetry, while the maximum horizontal displacement is not distinct. The topographical asymmetry has a grea- ter influence on maximum principal tensile stress and maximum arch normal stress than that on other stress components. Compared with the simulated symmetrical valley, the overload capacity of Baihet- an Arch Dam reduces with the increasing load, by rotating relatively around the right abutment.