金沙江白鹤滩水电站左岸雾化区边坡稳定性分析  

Stability Analysis of Atomized Slope on the Left Bank of Jinsha River for Baihetan Hydropower Station

作　　者：尹鹏海[1,2] 姚孟迪[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,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：《中国农村水利水电》2013年第8期137-141,共5页China Rural Water and Hydropower

基　　金：国家重点基础研究发展计划("973"计划)资助项目(2011CB013501;2010CB732005);教育部新世纪优秀人才支持计划项目(NCET-11-0406)

摘　　要：为研究泄洪雾化雨对白鹤滩水电站左岸边坡稳定性的影响,通过分析坝址区工程地质条件,确定了左岸雾化区边坡稳定性的计算条件,基于一次典型泄洪雾化降雨过程的三维饱和非饱和渗流有限元计算成果,考虑暂态饱和区的渗透荷载、非饱和区的负孔隙水压力及结构面遇水软化降低其抗剪强度等,采用FLAC3D软件对左岸边坡在不同时刻的横河向位移、应力、剪切应变率及塑性区进行计算。通过与天然状态比较分析可知,降雨入渗将显著抬高坡面浅部的压力水头,在坡脚处会出现大范围的暂态饱和区,坡体变形、应力、剪切应变率的量值均有显著提高,降雨入渗还可能诱发坡体深层滑动破坏,致使坡体局部稳定性恶化。In order to study the impact which atomized rain caused by flood discharge has on the stability of slope on the left bank for Baihetan hydropower station,through analyzing the geological conditions of dam site,the computational condition of slope stability are determined.Based on the results of 3-D saturated-unsaturated seepage computation by finite element method in the process of a typical atomized rainfall caused by flood discharge,considering seepage pressure of the transient saturated zone,negative pore water pressure of the unsaturated zone,and the softening effect which will reduce the shear strength of saturated structural planes,this paper computes the vertical displacement,stress distribution,shear strain rate,and the plastic zone of the left slope at different moments using the software FLAC3D.Through the comparison with natural state,rainfall infiltration will significantly raise pressure head of the shallow slope,transient saturated zone with large scale will appear in the slope toe.The value of deformation,stress,and shear strain rate will increase significantly compared to the natural state.Rainfall infiltration could also induce damage of the deep slope slide,which will worsen stability of the local slope.

关 键 词：边坡稳定性 泄洪雾化雨 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]