溪洛渡特高拱坝初蓄期应力应变监测资料分析

Analysis on monitored stress and strain of Xiluodu super high arch dam during initial impoundment

溪洛渡拱坝最大坝高接近300 m,国内外可借鉴的经验相对较少,建设和初次蓄水运行过程中的工作性态一直备受关注。根据溪洛渡拱坝内埋设的应变计组实测资料(截至2014年10月5日),计算拱坝在初次蓄水阶段的应力状态,分析其发展过程,并和有限元仿真计算结果相对比,为评估大坝运行的安全性提供依据。监测资料分析结果表明,拱坝应力发展过程和应力分布符合一般认识规律,库水位抬升至正常蓄水位后,坝踵和坝趾仍都处于受压状态,拱坝在初蓄期工作性态正常。

As its maximum height reaches about 300 m and few similar engineering experiences havebeen encountered worldwide, much attention is focused on the stress and strain state of Xiluodu archdam heel during the initial impounding period. Based on the monitoring data（by October 5th, 2014）,this paper tries to analyze the stress and strain of the arch dam heel during the initial impounding peri-od. Further, comparison with the finite element simulation is carried out. The analysis results shows thatthe stress process and the distribution on the arch dam are in accordance with the general laws. And thedam heel remains compressed when the reservoir water level reaches the normal elevation. It is suggest-ed that the arch dam is working normally during the initial impoundment.