白鹤滩水电站反拱型底板非线性静力分析

基于非线性接触理论,结合有限元分析方法对弦长达到130m、分块较多的反拱底板水垫塘进行敏感性分析,研究正向荷载作用下不同锚固水平和方式、反拱曲率及键槽对反拱水垫塘稳定性的影响.并得出以下结论:锚筋对反拱形底板的整体稳定起关键性作用；均布荷载作用下锚筋均匀分布最利于整体稳定,中间板块不锚固是可以选择的利于成拱的方式；对于弦长达130 m的反拱水垫塘,反拱圆心角74°左右较合理；键槽对局部稳定性有明显提高.

Nonlinear stability analysis of the counter-arched slabfor Baihetan hydropower project

Based on the nonlinear contact theory, combined with finite element analysis method ,this paper made sensitivity analysis of counter-arched slab whose chord length is 130m and which has more than 9blocks. It also studied the influence on the stability of the counter-arched slab under different anchor level and way, different reverse arch curvature and key groove. And it draw the following conclusion that anchor bar plays key role in counter-arched slab's overall stability; uniform anchor bar distribution is the most suitable way for the overall stability and intermediate plate without anchor bar can be selected as a good way; for reverse- arch-shaped water cushion pond whose chord length up to 130m, the arch central angle about 74° is reasonable; the local stability has increased significantly by the influence of key groove.