某水库除险加固中双曲拱坝应力及稳定分析

Stress and Stability Analysis of Double-curvature Arch Dam in Reinforcement of a Reservoir

拱坝应力及稳定计算是水库除险加固中判断大坝结构安全最关键的因素,直接关系到大坝结构安全,以及大坝能否继续使用。以某双曲拱坝除险加固为例,采用北京水规院开发的GADAP25拱坝软件进行不同荷载工况况拱坝应力计算,同时开展大坝右岸重力墩稳定计算分析,计算结果表明,除拱坝在112.0 m高程个别应力不满足规范外,其余应力满足要求,重力墩体稳定性均满足要求,大坝结构安全。同时还发现GADAP25在应力及稳定分析中计算简单,易于编程,可以获得较好的设计效果,是一种简单、实用的计算方法。本次河拱坝应力及稳定计算为本工程及同类型工程提供设计方法和经验借鉴。

The stress and stability calculation of arch dams are the most critical factors for judging the safety of dam structures in reservoir reinforcement.It is directly related to the safety of the dam structure and whether the dam can continue to be used.A double-curvature arch dam is taken as an example,and the GADAP25 arch dam software developed by Beijing Water Planning Institute is used in this study to calculate the stress of the arch dam under different load conditions.At the same time,the stability calculation analysis of the gravity pier on the right bank of the dam is carried out.The calculation results show that,except the individual stress of the arch dam at the 112.0 m elevation does not meet the specification,the rest of the stress meets the requirements.The stability of the gravity pier body meets the requirements,and the dam structure is safe.At the same time,it is also found that GADAP25 is simple to calculate in stress and stability analysis,easy to program,and can obtain better design results.It is a simple and practical calculation method.This arch dam stress and stability calculation can provide design methods and experience for this project and similar projects.