某水库除险加固中双曲拱坝应力及稳定计算分析

Calculation and Analysis of Stress and Stability of Hyperbolic Arch Dam during Reinforcement of 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,通过采用北京水规院开发的GADAP25拱坝软件进行不同荷载工况下拱坝应力计算,同时开展大坝右岸重力墩稳定计算以及坝肩岩体稳定性分析。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,重力墩以及坝肩岩体稳定性均满足要求,大坝结构安全。同时还发现,GADAP25以及水利计算程序PC1500等软件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。计算成果可为同类型工程提供设计方法和经验借鉴。

The calculation of arch dam stress and stability is the most critical factor to determine the safety of the dam structure in the process of reservoir reinforcement.It is directly related to the safety of the dam structure and whether the dam can continue to be used.Taking a double-curvature arch dam as an example,the stress calculation of the arch dam under different load conditions was carried out by using GADAP25 arch dam software developed by Beijing Water Planning Institute.Meanwhile,the stability calculation of gravity pier on the right bank of the dam and the stability analysis of abutment rock mass were carried out.The calculation results show that the individual stress of the arch dam at 112.0m elevation does not meet the specifications.The stability of gravity pier and abutment rock meet the requirements,and the dam structure is safe.At the same time,it is found that GADAP25 and hydraulic calculation program PC1500 are easy to calculate and program in stress and stability analysis,and can obtain better design effect.They are simple and practical calculation methods.The emergency and stability calculation of river arch dam provides design method and experience reference for this project and similar projects.