奥运赛事对十三陵水库大坝长期稳定性的影响分析

Analysis on impacts from Olympic events on long-term stability of Ming Tombs Reservoir Dam

2008北京奥运铁人三项比赛及残奥会公路自行车比赛在十三陵水库大坝进行。赛事前后及赛事期间相关工程荷载与循环比赛荷载对大坝产生了一定程度的扰动,为了掌握这种扰动在赛期对大坝是否有影响、赛后大坝是否处于长期稳定状态,赛期和赛后对大坝坝坡进行了长达3个多月的现场变形监测,同时,利用变形监测数据,基于流变理论,对奥运会和残奥会赛期坝体稳定性及残奥会赛后的长期变形规律和长期稳定性进行了数值流变分析。结果表明,奥运及残奥会比赛期间大坝不产生新的拉应力和剪切塑性区,大坝处于稳定安全状态;大坝的变形和应力在残奥会赛事结束后两个月内还有持续变化趋势,2个月后大坝的变形及应力趋于稳定,大坝将长期处于安全稳定状态。

During 2008 Beijing Olympic and Paralympic Games, the Triathlon and Road Cycling are held at the dam of Ming Tombs Reservoir; from which a certain disturbance upon the dam is caused by the relevant engineering loads and cyclic loads before and after the Olympic events concerned. The in-situ deformation monitoring made on the dam body is carried out for over 3 months during and after the event, so as to know whether this kind of disturbance has some impacts on the dam during the event, or whether the dam would be under a long-term stable condition afterwards. At the same time, the numerical analysis of rheologieal character on the dam stability during the events and both the long-term deformation law and the long-term stability of the dam is made with the data from the deformation monitoring based on the rheological theory concerned. The result shows that the dam is under a stable condition without any occurrences of new tension stress and plastic shearing zones. The changes of the deformation and stress of the dam body continue for about 2 months more after the event, but tend to be stable afterwards. Therefore, the dam body will surely operate under a long-term safe and stable condition.