半埋式深竖井结构的三维动力响应特征

3D dynamic response characteristics of partly-buried deep shaft structure

半埋式深竖井结构的地质条件复杂、上下两部分的约束条件不同、不确定因素多,整体结构的受力特性非常复杂.运用三维动力有限元技术,采用振型分解反应谱法对德泽水库半埋式深竖井泄洪洞的应力变形等动力反应特性及其稳定性进行了计算分析,并基于ANSYS二次开发,采用高斯积分法实现了由竖井各断面应力到内力的转化,可作为配筋的依据.计算结果表明:德泽水库半埋式深竖井泄洪洞的位移和应力在地震荷载作用下呈现出特定的规律,位移和应力值均满足结构安全性的要求,下部围岩可提高竖井的抗震性能.研究成果可为德泽水库半埋式深竖井泄洪洞的结构设计提供重要依据,对类似工程也具有一定的参考价值.

As a result of complex structure and geological conditions, different constraints between upper and lower parts, as well as many other uncertainties, the overall structural force characteristic of the part- ly buried deep shafts is very complicated. The 3D dynamic finite element techniques and response spectrum analysis method are applied to compute the dynamic response characteristics, such as stress, deformation etc, and stability of the partly buried deep shafts spillway tunnel of Deze reservoir. Meanwhile, based on secondary development of ANSYS, Gauss integration is adopted to achieve the transformation of stress in each section to force of the shafts, which can be used as a basis for reinforcement. The results indicate that： under earthquake loads, the stresses and displacements of the partly buried deep shafts show a spe- cific rule, which both meet the structural safety requirements; and the bottom rock can improve the aseis- mic performance of the shafts. The research results can provide important support for the structural design of the partly buried deep shafts, so as to provide a certain reference for similar projects.