检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
出 处:《重庆交通大学学报(自然科学版)》2015年第4期62-67,共6页Journal of Chongqing Jiaotong University(Natural Science)
基 金:长江学者和创新团队发展计划项目(IRT1045);重庆市交通委员会科技项目(2007 CQJTK 023)
摘 要: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145 m上升至155,165,175 m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150,155,160,165,170,175 m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175 m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5 m,3种工况下的路堤安全系数平均增大幅度约为5%。Natural fluctuation of water level has a great effect on the stability of super high fill in the Three Gorges Reservoir.With continuous rising of water levels,the water will actively infiltrate into the slope under the effect of pore water pressure and seepage flow in unsaturated soils. Firstly,based on seepage calculation theory,FLAC was applied to simulate the seepage field change of the V-shaped gully super high fill in the Three Gorges reservoir when the water level had been rising from145 m up to 155,165,175 m. Then,variation rules of important parameters including saturation,pore water pressure,horizontal displacement and maximum shear strain increment were analyzed. The relation between safety factors and different heights( 150,155,160,165,170,175 m) of rising of water level were researched in three working conditions,including rising of water level,rising of water level under 3D effect condition,rising of water level under 3D effect and two times as much as normal loads conditions. Eventually,calculation results show that: with water level continuously rising,the saturation of the fill increases,which will result in more concave saturated seepage line and higher pore water pressure; the safety factors of three kinds of working conditions are increased,up to the max level( 175m),the stability safety factors reach the maximum. The change rate of safety factors decreases first and then increases. The water level rises up by each 5 m; the average safety factors increase about 5% in three working conditions.
关 键 词: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
分 类 号:U416.12[交通运输工程—道路与铁道工程]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.13