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库水位上升对V型冲沟超高路堤稳定性的影响

DOI: 10.3969/j.issn.1674-0696.2015.04.11, PP. 62-67

Keywords: 道路工程,V型冲沟,超高路堤稳定性,安全系数,渗流场,饱和浸润线,roadengineering,V-shapedgully,stabilityofsuperhighfill,safetyfactor,seepagefield,saturatedseepageline

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Abstract:

:?三峡水库水位季节性上涨对库岸超高路堤稳定性有显著影响,库水位上升后在孔隙水压力和渗流作用下,水流不断从坡外向坡内渗透。基于渗流计算理论,运用FLAC软件模拟了库水位从145m上升至155,165,175m时库区V型冲沟超高路堤渗流场变化;分析了坡体饱和度、孔隙水压力、水平位移及最大剪应变增量的变化规律;研究了水位上升、水位上升和三维效应、水位上升和三维效应及超载两倍等3种工况下路堤安全系数随库水位上升至150,155,160,165,170,175m时的变化关系。研究表明:随库水位上升,坡体饱和度升高,孔隙水压力增大,饱和浸润线向坡内倾斜;3种工况路堤安全系数都增大,至175m时安全系数达到最大,安全系数变化率为先减小后增大;库水位每上升5m,3种工况下的路堤安全系数平均增大幅度约为5%。

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