摘要
以拟建燕云水电站重力坝为例,采用有限元法计算了坝基在水位下降过程中的应力应变特性,研究了在水位下降过程中坝基破坏模式、抗滑稳定系数、渗流场和坝基垂直有效应力分布等4个方面的变化趋势。结果表明:上游水位下降对该重力坝坝基破坏模式影响显著,上游水位较高时为表层滑动,死水位时为浅层滑动;水位下降还将导致重力坝抗滑稳定系数增大,坝基最大渗流速度和渗漏量也逐渐降低,坝基防渗墙底部最大垂直有效应力逐渐增大,坝趾垂直有效应力则逐渐减小,坝踵应力水平均较低,不存在受拉现象,满足规范要求。研究成果对工程建设的顺利开展有一定指导意义。
In order to study the foundation stability influence of gravity dam when upstream water level dropped, taking the Yanyun hydropower station dam as an example, the stress and strain characteristics of dam foundation in the process of water level decline is calculated by finite element method,we research four aspects of change trends during the water level decline： dam failure mode, the anti sliding stability, seepage field and the stress distribution of dam foundation vertical effective stress. The results show that the upstream water level decreased has significant influence on the dam foundation failure mode, the surface is sliding when the upstream water level higher, the shallow is sliding when at the dead water level; water level decline will lead to increase the anti sliding stability coefficient of gravity dam, dam foundation seepage and leakage rate is gradually reduced, the maximum vertical effective stress gradually increase at the bottom of the dam foundation impervious wall, the dam toe vertical effective stress decreases, the dam heel stress level was low, but there is no tension phenomenon, can meet the requirements of specification. The research results have certain guiding significance for the smooth development of engineering construction.
出处
《水科学与工程技术》
2017年第5期88-92,共5页
Water Sciences and Engineering Technology
关键词
水电站
重力坝
有限元法
坝基渗流
稳定系数
hydropower station
gravity dam
finite element method
seepage
stability factor
