动荷载作用下混凝土重力坝应力及稳定性分析

Stress and Stability Analysis of Concrete Gravity Dam under Seismic Load

为研究地震荷载作用下重力坝稳定及应力变形规律,通过有限元数值模拟方法对溢流坝段和非溢流坝段进行了三维模型计算。地震荷载组合作用下,坝体水平位移更大,坝顶部水平位移最大,坝踵处竖向位移最大;坝体的最大大主应力、小主应力也更大,且坝踵处大主应力最大,廊道附近小主应力最大;坝体的安全系数最小,且在相同荷载组合下溢流坝段的安全系数比非溢流坝段的更小。

To study the stability and deformation of a gravity dam under seismic load,three-dimensional finite element analysis of the overflow dam section and the water retaining dam section are carried out.Under the seismic load combination,the dam bodies are of larger horizontal displacements,with the maximum horizontal displacement at the dam crest and the maximum vertical displacement at the dam heel.Also,the maximum principle stresses of the dam bodies are larger,with the maximum major principle stress at the dam heel and the maximum minor principle stress near the gallery.While,the safety factor of the dam bodies are the smallest,and the overflow dam section is of smaller safety factor than the water retaining dam section under the same load combination.