锦屏一级水电站左岸边坡渗流计算及稳定性分析  

Seepage Calculation and Stability Analysis on Left Slope of Jinping-Ⅰ Hydropower Station

作　　者：荣冠[1] 周创兵[1] 江进辉[1] 张伟[2] 

机构地区：[1]武汉大学水利水电学院,武汉430072 [2]南阳理工学院,河南南阳473001

出　　处：《长江科学院院报》2005年第6期49-53,共5页Journal of Changjiang River Scientific Research Institute

摘　　要：基于锦屏一级左岸高边坡基本工程地质条件,深入研究了边坡岩体的渗透特性.结合雾化降雨试验资料,利用非饱和渗流有限元方法,计算并得出了边坡雾化雨条件下渗流场的变化规律:雾化雨将显著抬高边坡浅层地下水水位,在边坡平缓处和坡脚处会出现暂态饱和区;不考虑防排水措施时,坡脚最大水位升幅在135 m左右,暂态饱和区水平深度在20～40 m之间;边坡上部压力水头受影响的水平深度在80～100 m,深部渗流场几乎不受降雨入渗影响;坡面防水和坡体排水措施可有效抑制地表入渗引起的压力水头升高和暂态饱和区范围扩大.同时借鉴非饱和强度理论运用Sarma法分析了雾化雨对边坡稳定性的影响.降雨条件下浅部滑动模式稳定系数由1.223降至1.054;深部滑移模式则由1.455降至1.416.渗流及稳定性研究成果可供雾化区边坡渗控和锚固工程设计参考.Based on analyzing engineering geological conditions of Jinping-Ⅰ Hydropower Station left slope, the permeability of slope rock masses was researched deeply. In combination with the experimental data of atomized water, the seepage field of the slope was gotten through unsaturated FEM permeability calculation. The results are summarized as follows： The pressure head is raised at superficial place in the high slope caused by atomizing rainfall and temporary saturated zone can exist at the base of slope; Without regard to drainage facility, the pressure head can reach about 135 m at the base of the slope and the horizontal range of temporary saturated zone is 20-40 m; At top of slope, the horizontal affected range of pressure head is 80-100 m, and there is scarcely any change in the deep of slope; The waterproof and drainage works can suppress effectively the increase of pressure head and the appearance of temporary saturated zone because of the surface infiltration. Then, based on unsaturated strength theory, slope stability influenced by atomized rainfall was analyzed by using Sarma method. The stability factor decreases from 1.223 to 1.054 at superficial layer slide, and it is from 1.455 to 1.416 at deep layer slide because of rainfall infiltration. And it is of great importance in application to designing drainage and reinforcing slope engineering.

关 键 词：锦屏一级水电站 边坡 降雨入渗 饱和非饱和渗流 

分 类 号：TV2223.4[水利工程—水工结构工程]