唐河水库大坝设计及稳定分析

Design and Stability Analysis of Tanghe Reservoir Dam

根据唐河水库工程的实际地质和地形条件,主要对唐河水库混凝土面板堆石坝和混凝土重力坝以及泄洪冲砂闸进行了设计,同时对混凝土重力坝的应力和坝基抗滑稳定进行了计算分析以及根据规范校核了泄洪闸稳定性。计算结果表明,坝体及坝基面最大垂直正应力分别为357.1 kPa和539.8kPa,在最不利工况下坝基抗滑稳定安全系数为3.26,均能满足规范要求;遭遇Ⅶ度地震时,泄洪闸闸室基底抗滑稳定安全系数最小为3.52;最不利工况下消力池边墙抗滑及抗倾稳定安全系数分别为2.19和2.74,均小于规范允许值。计算表明各工况下的坝体、泄洪闸的稳定和应力均能满足规范要求。综合论证了设计的合理性。

According to the actual geological and topographical conditions of Tanghe Reservoir,the concrete facing rockfill dam,concrete gravity dam,flood discharging sluice,flushing sluice and irrigation tunnel are mainly designed here.The concrete gravity dam＇s stress and the dam foundation＇s stability against sliding are also calculated and analyzed,meanwhile,the stability of the sluice is re-checked.The results show that the maximum vertical normal stress of the dam and foundation surface is respectively 357.1 kPa and 539.8 kPa,and the sliding stability safety factor of the dam foundation is 3.26 in a most unfavourable condition.The minimum sliding stability safety factor of the sluice chamber is 3.52 when the dam is subjected to the Ⅶ degree earthquake,and the safety factor against sliding and overturning of the stilling pool wall is respectively 2.19 and 2.74 in a most unfavourable condition.In a word,under various operating conditions,the stability and stress of the dam and sluice could meet the regulatory requirements.So the rationality of the design is comprehensively demonstrated.