降雨条件下抽水蓄能电站尾水边坡渗流特征及变形分析  

Analysis of Seepage Characteristics and Deformation of the Tailrace Slope of a Pumped Storage Power Station under Rainfall Conditions

作　　者：毛振凯 杨柱 龚盛 苏振坤 Mao Zhenkai;Yang Zhu;Gong Sheng;Su Zhenkun(Northwest Engineering Corporation Limited,Power China,Xi'an 710065,China;School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西安科技大学建筑与土木工程学院,西安710054

出　　处：《西北水电》2025年第1期94-99,共6页Northwest Hydropower

基　　金：国家自然科学基金项目(U1965107,51979218)。

摘　　要：为探究电站尾水边坡在降雨条件下的变形及稳定性,采用有限元计算强降雨条件下边坡的渗流场分布,并将渗流场计算结果导入颗粒流模型中分析。结果表明:受雨水入渗及坡体自身渗流场的影响,坡脚区域首先出现暂态饱和区;随着降雨历时增加,入渗影响范围增大,坡脚处渗流方向发生偏转,方向由竖直向下逐渐转向指向坡内;降雨前中期坡体变形集中在浅表,坡体位移增大区域与暂态饱和区域相同,降雨后期坡体产生了圆弧形潜在滑面,坡体变形呈现出推移式滑坡的特点,而坡脚起到了阻滑作用,因此需要注意坡脚部位的施工支护及排水措施。In order to explore the deformation and stability of the tailrace slope of the power station under rainfall conditions,the finite element method is used to calculate the distribution of the seepage field of the slope under heavy rainfall conditions,and the calculation results of the seepage field are imported into the particle flow model for analysis.The results show that affected by the infiltration of rainwater and the seepage field of the slope itself,a transient saturated zone first appears in the toe area of the slope.As the rainfall duration increases,the influence range of infiltration expands,and the seepage direction at the toe of the slope deflects,changing from vertically downward to gradually pointing into the slope.In the middle and early stages of rainfall,the deformation of the slope body is concentrated on the surface,and the area where the slope displacement increases is the same as the transient saturated area.In the later stage of rainfall,a circular arc-shaped potential slip surface is generated in the slope body,and the deformation of the slope body shows the characteristics of a pushing landslide.However,the toe of the slope plays a role in resisting sliding.Therefore,attention should be paid to the construction support and drainage measures at the toe of the slope.

关 键 词：尾水边坡 降雨入渗 非饱和渗流 颗粒流 

分 类 号：TV221[水利工程—水工结构工程]