库水位骤降下除险加固后土坝安全性态响应及评价  

Response and Evaluation of Reinforcement Engineering Safety State under Rapid Drawdown of Reservoir Water Level

作　　者：尹吉娜 柴瑞[2] 杨杰[1] 任洁 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]四川省清源工程咨询有限公司,四川成都610072 [3]河北省石津灌区管理局,河北石家庄050000

出　　处：《水电能源科学》2015年第7期76-79,共4页Water Resources and Power

基　　金：国家自然科学基金青年基金项目(41301597);陕西省生态水利工程国家重点实验室基金资助项目(106-210509);长江水利委员会长江科学院开放研究基金资助项目(CKWV2013202/KY)

摘　　要：为了研究库水位骤降对土石坝工程安全性态的影响,基于土体的非线性特性及渗透特性,利用有限元法模拟水位变动下的坝体渗流场及稳定性的响应情况,将得出的孔隙水压力、水面线等结果应用于上游坝坡的稳定性响应研究中。计算结果表明,水位降速越大,浸润线最高点越高,逆流越明显,上游坝坡稳定性越差,恢复至稳定的时间越久;坝体渗透系数越小,临水坝坡浸润线上凸现象越明显;坝内渗流场的变化滞后于库水位下降的时间。即便是除险加固工程,也要合理控制库水位的降落,为水位骤降时边坡类工程的合理运行与管理提供了可靠的依据。In order to study the influence on the safety behavior of earth-rock dam during the rapid water drawdown, it is necessary to simulate the response of seepage field and stability field under the rapid drawdown. Based on the non-lin earity and permeability of the soil, this paper simulates the seepage fields of different conditions with the finite element method. And then the results of pore water pressure and free water surface line are used to analyze the upstream dam slope stability. The results show that the greater the rate of water level drawdown is, the higher the saturation line peak is; the worse the stability of upstream dam slope and the longer the time of returning to stability is~ the smaller the os- motic coefficient of dam body is, the more obvious the ＂go back＂ is; the changes of seepage delay in the time of water lev- el drawdown; it is essential to control the water level drawdown despite the reinforcement engineering. This paper pro- vides reliable basis for the design and management of the slope engineering during water drawdown.

关 键 词：库水位骤降 非稳定渗流 安全性态响应 除险加固 有限元法 

分 类 号：TV139.14[水利工程—水力学及河流动力学]