锦屏一级水电站边坡变形对拱坝影响分析  

An Analysis of the Influence of Slope Deformation on Arch Dam of Jinping Ⅰ Hydropower Station

作　　者：邱茂星 位伟[1] QIU Mao-xing;WEI Wei(School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072

出　　处：《中国农村水利水电》2021年第10期128-135,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(42077253,51769014)。

摘　　要：库岸边坡在长期库水涨落循环作用下容易发生变形,进而可能引起大坝的开裂甚至破坏,因此边坡变形对拱坝安全有重要影响。锦屏一级水电站经历了六次库水涨落循环,依据监测资料,对边坡变形进行流变反演计算,并通过正向计算预测了边坡的长期变形情况,研究了在上游正常蓄水位1880 m和死水位1800 m两种水位条件下,及不同边坡变形情况下拱坝的变形和应力分布情况。结果表明,2012年蓄水后至2020年7月,拱坝整体变形较小,右岸1800 m高程以上坝肩拉应力区明显减小,拱坝受力状态有局部改善;2020年7月至边坡长期变形收敛阶段,拱肩槽边坡变形较小,左拱端下游侧横河向变形增量小于1.2 mm,拱坝拉应力量值和分布范围改变不明显。因此,水库蓄水后至边坡长期变形收敛阶段,拱坝应力应变量值处于合理区间,锦屏一级高拱坝应力应变总体处于弹性工作的安全运行状态。The bank slope of reservoir is prone to deformation under long-term circulation of reservoir water fluctuation,which may lead to the cracking and even failure of the dam. Therefore,slope deformation has important influence on the safety of the arch dam. Jinping Ⅰ Hydropower Station has experienced six fluctuation cycles of the reservoir water. The rheological inversion calculation of the slope deformation is conducted based on the monitoring data,and the long-term deformation of the slope is predicted. In development,the deformation and stress conditions of the arch dam under the conditions of normal water level of 1 880 m and dead water level of 1 800 m and different slope deformation are studied. The results show that the overall deformation of the arch dam was minor from the impoundment to July 2020. Furthermore,it is revealed that the tensile stress area of the abutment above the elevation of 1 800 m of the right bank decreased significantly,which means that the stress state of the arch dam has been partially improved. On the other hand,during the stage from July 2020 to the convergence of the slope after the long-term deformation,the deformation of the abutment groove slope will be small,the transverse deformation increment of downstream side of the left arch end will be less than 1.2 mm,and the magnitude and distribution range of the tensile stress of the arch dam will not change obviously. Therefore,from the reservoir impoundment to the convergence of the slope after the long term deformation,the stress and strain values of the arch dam are in a reasonable range,and the stress and strain of Jinping Ⅰ high arch dam are generally in the safe operation state of elastic work.

关 键 词：高拱坝 边坡变形 应力 水库蓄水 锦屏一级水电站 

分 类 号：TV642.4[水利工程—水利水电工程]