降雨工况下渗透力对粗粒土高路堤边坡稳定性的影响
发布时间：2018-11-09 13:36
【摘要】：为分析降雨工况下,渗透力对粗粒土高路堤边坡塑性区分布以及安全系数变化规律的影响,依托现场工程实例,以粗粒土骨架为研究对象,采用geo-studio软件中的seep模块计算边坡降雨过程中及降雨停止后水位线、基质吸力、渗流梯度的变化规律;利用FLAC3D内置的fish语言将渗流计算结果导入到FLAC3D中;综合考虑水位线、基质吸力变化,分析了渗透力变化对粗粒土高路堤边坡安全系数以及塑性区分布规律的影响。数值计算结果表明:降雨影响水位线、基质吸力、渗流梯度在边坡空间上的分布;降雨过程中水位线逐渐由坡脚抬升并向粗粒土高路堤边坡内部扩展,降雨停止后坡脚处水位线下降较快且路堤中心水位线高于初始状态水位线高度;水位线抬升过程中基质吸力逐渐消散,降雨停止后基质吸力恢复较缓慢;降雨初期坡脚处x方向渗流梯度逐渐由正值转为负值且负值分布的区域逐渐扩大;随降雨历时增加边坡塑性区由坡脚不断向边坡内部逐渐延伸,降雨停止后边坡塑性区主要发生在坡脚处;降雨0~24 h内边坡安全系数呈逐渐增大的趋势,降雨24~72 h内安全系数下降较快并达到最小值,降雨停止后安全系数逐渐恢复,但安全系数恢复过程具有一定滞后性并且恢复后的数值小于初始值。
[Abstract]:In order to analyze the influence of permeability on the distribution of plastic zone and the variation of safety factor of high embankment slope under rainfall condition, the skeleton of coarse grained soil is taken as the research object. The seep module in geo-studio software is used to calculate the variation law of water level, matrix suction and seepage gradient in the process of slope rainfall and after the rainfall stops. The seepage calculation results are introduced into FLAC3D by fish language built in FLAC3D. Considering the variation of water level and matrix suction, the influence of seepage force on the safety factor and plastic zone distribution of high embankment slope of coarse grained soil is analyzed. The numerical results show that rainfall affects the distribution of water level line, matrix suction and seepage gradient in the slope space. In the process of rainfall, the water level line gradually rises from the foot of the slope and extends to the inner slope of the high embankment with coarse grained soil. After the rainfall stops, the water level at the foot of the slope decreases faster and the water level at the center of the embankment is higher than the height of the water line in the initial state. The matrix suction gradually dissipates during the elevation of the water level, and the matrix suction recovers slowly after the rainfall stops, and the gradient of the x direction seepage at the foot of the slope gradually changes from positive to negative at the beginning of the rainfall, and the area with the negative distribution expands gradually. With the increase of rainfall duration, the plastic zone of the slope extends gradually from the foot of the slope to the interior of the slope, and the plastic zone of the slope mainly occurs at the foot of the slope after the rainfall stops. The safety factor of slope increases gradually within 24 hours of rainfall, decreases rapidly and reaches the minimum value within 72 hours of rainfall, and recovers gradually after rainfall stops. But the recovery process of safety factor has some lag and the value after recovery is smaller than the initial value.
【作者单位】： 长沙理工大学特殊环境道路工程湖南省重点实验室;长沙理工大学交通运输工程学院;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金项目(51508042,51508040,51678073,51578079) 特殊环境道路工程湖南省重点实验室开放基金项目(kfj140501) 湖南省重点研发计划项目(2016SK2023)
【分类号】：U416.12
本文编号：2320559
[Abstract]:In order to analyze the influence of permeability on the distribution of plastic zone and the variation of safety factor of high embankment slope under rainfall condition, the skeleton of coarse grained soil is taken as the research object. The seep module in geo-studio software is used to calculate the variation law of water level, matrix suction and seepage gradient in the process of slope rainfall and after the rainfall stops. The seepage calculation results are introduced into FLAC3D by fish language built in FLAC3D. Considering the variation of water level and matrix suction, the influence of seepage force on the safety factor and plastic zone distribution of high embankment slope of coarse grained soil is analyzed. The numerical results show that rainfall affects the distribution of water level line, matrix suction and seepage gradient in the slope space. In the process of rainfall, the water level line gradually rises from the foot of the slope and extends to the inner slope of the high embankment with coarse grained soil. After the rainfall stops, the water level at the foot of the slope decreases faster and the water level at the center of the embankment is higher than the height of the water line in the initial state. The matrix suction gradually dissipates during the elevation of the water level, and the matrix suction recovers slowly after the rainfall stops, and the gradient of the x direction seepage at the foot of the slope gradually changes from positive to negative at the beginning of the rainfall, and the area with the negative distribution expands gradually. With the increase of rainfall duration, the plastic zone of the slope extends gradually from the foot of the slope to the interior of the slope, and the plastic zone of the slope mainly occurs at the foot of the slope after the rainfall stops. The safety factor of slope increases gradually within 24 hours of rainfall, decreases rapidly and reaches the minimum value within 72 hours of rainfall, and recovers gradually after rainfall stops. But the recovery process of safety factor has some lag and the value after recovery is smaller than the initial value.
【作者单位】： 长沙理工大学特殊环境道路工程湖南省重点实验室;长沙理工大学交通运输工程学院;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金项目(51508042,51508040,51678073,51578079) 特殊环境道路工程湖南省重点实验室开放基金项目(kfj140501) 湖南省重点研发计划项目(2016SK2023)
【分类号】：U416.12
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