摘要
以大源渡航电枢纽二线船闸基坑工程为例,结合饱和-非饱和理论,通过有限元软件Geo-Studio中seep/w模块和slope/w模块建立二维数值模型,对强降雨情况下边坡渗流状态进行分析,得到边坡内部含水率和孔隙水压力变化规律以及安全系数和滑裂面的变化情况。结果表明:随着降雨历时的增加,坡面含水率逐渐增加,雨水不断向更深层土体入渗,地下水位线不断上升,基质吸力逐渐消散,坡体表面形成暂态饱和区,安全系数随之减小。降雨停止后,水分逐渐流出坡体,含水量逐渐减小,地下水位随之逐渐下降,正孔压减小,基质吸力逐渐恢复,安全系数逐渐增大。降雨入渗对边坡浅层土体影响较大,对深层土体影响较小,一般形成浅层破坏。
Taking the deep foundation pit slope of second-line ship lock for Dayuandu navigation-power junction as an example,combined with the saturated-unsaturated theory,this paper establishes a two-dimensional numerical model by seep w module and slope w module in the finite element software Geo-Studio to analyze the seepage state of the slope under heavy rainfall,through which the change of variation of water content and pore water pressure inside the slop,the safety factor and the variation of the slip surface are obtained.The results show that with the increase of rainfall duration,the slope moisture content increase gradually,the rainwater continues to infiltrate into the deeper soil,the groundwater level rises continuously,the matrix suction gradually dissipates,the surface of the slop forms a transient saturation zone,and the safety factor decreases.After the rainfall stopped,the water gradually flowed out of the slop,the water content gradually decreased,the underground water level decreased gradually,and the positive hole pressure decreased,the matrix suction gradually recovered,and the safety factor increased gradually.Rainfall infiltration has a great influence on the shallow soil of the slope,has little effect on the deep soil,and forms shallow damage generally.
作者
颜方方
黄伦超
周千凯
邓凌谨
YAN Fang-fang;HUANG Lun-chao;ZHOU Qian-kai;DENG Ling-jin(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China;Hunan Provincial Traffic Planning Survey&Design Institute Co.,Ltd.,Changsha 410008,China;Hunan Water Transport Construction Investment Group Co.,Ltd.,Changsha 410011,China)
出处
《水运工程》
北大核心
2019年第3期24-28,46,共6页
Port & Waterway Engineering
基金
湖南省交通运输厅科技进步与创新项目(201243)
关键词
降雨入渗
孔隙水压力
边坡稳定
有限元分析
rainfall infiltration
pore water pressure
slop stability
finite element analysis
