白鹤滩水电站左岸雾化区边坡稳定性分析  

Stability analysis of slope in atomized area at left bank of Baihetan Hydropower Station

作　　者：刘妍华[1,2] 陈特[1] 王庆[1] 唐栋[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《人民长江》2012年第5期59-63,共5页Yangtze River

基　　金：国家自然科学基金资助项目(50879081;50979063);国家重点基础研究发展"973"计划(2011CB013501;2010CB732005)

摘　　要：为深入研究雾化雨入渗引发的岩体边坡失稳机制,基于白鹤滩水电站高边坡基本地质条件和稳定性控制边界条件,采用饱和-非饱和渗流有限元分析方法,借鉴饱和-非饱和强度理论,研究了边坡在雾化雨条件下的渗流场变化规律。采用严格Janbu法、Sarma法、不平衡推力法对两岸边坡进行二维极限平衡分析,并且综合分析了雾化区边坡岩体及控制性结构面的强度及荷载变化规律,计算得到雾化区边坡在各种工况条件下稳定性变化规律。分析表明,降雨入渗将使边坡坡面浅部的压力水头抬升,坡脚局部饱和区最大水位升高;同时岩体的抗剪强度减小,边坡稳定性明显下降。In order to study the instability mechanism of rocky slope caused by atomized rain infiltration, based on the geological conditions of Baihetan Hydropower Station and the controlled boundary condition, the variation laws of slope seepage field in atomized rain are obtained by adopting the saturated- unsaturated seepage FEM and saturated -unsaturated strength theory. In addition, the two - dimensional limit equilibrium calculation is carried out for the slope by the Strict - Janbu, Sarma~ method and Imbalance Thrust Force. We analyze strength and load variation laws of slope rock and controlled structural faces, and the stabili- ty variation of the slopes under different conditions. The results show that rain water infiltration raises pressure water head of shallow slope as well as the maximum water level in local saturated area of the slope~ toe, decreases the shear strength of rock masses and the stability obviously.

关 键 词：边坡工程 极限平衡 雾化雨 降雨入渗 饱和-非饱和渗流 白鹤滩水电站 

分 类 号：P642[天文地球—工程地质学]