强降雨对路堤边坡渗流场及稳定性影响研究  

Research on Embankment Slope Seepage Field and Stability under Heavy Rainfall Conditions

作　　者：李涛[1,2] 徐伟青 曾铃[3] 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004 [2]浙江通衢交通建设监理咨询有限公司,浙江衢州324000 [3]长沙理工大学土木与建筑学院,湖南长沙410076

出　　处：《公路工程》2013年第4期1-4,39,共5页Highway Engineering

基　　金：国家自然科学基金项目(51278067;51278067);湖南省研究生科研创新项目(CX2012B353);广西科学研究与技术开发计划项目(1298011-2)

摘　　要：为了研究强降雨对路堤边坡渗流场及稳定性的影响,基于非饱和渗流及非饱和抗剪强度理论对降雨作用下的渗流场及边坡稳定性进行了研究。研究表明:降雨入渗将引起路堤内部地下水位线上升,上升速率在降雨前期大于降雨后期;降雨入渗作用下边坡体内孔隙水压力及体积含水量都逐渐增大,在达到饱和含水量的区域内基质吸力丧失,降雨停止后由于雨水的出渗,孔隙水压力与体积含水量缓慢降低,同时基质吸力得到缓慢的恢复;在降雨入渗影响下路堤安全系数降低明显,降雨停止后由于雨水的出渗,安全系数将得到一定程度的增大。In order to research the impact of heavy rainfall on the embankment slope seepage field and stability,based on the unsaturated seepage and unsaturated shear strength theory,studied the seepage field and slope stability under rainfall condition,Research shows that： ①Rainfall infiltration will cause the embankment internal water table rising,the increased rate of prophase rather than later stage;②Under the influence of rainfall infiltration,the pore water pressure and volume moisture content were increased gradually,in the saturated moisture content area matrix suction loss,because of the rain the permeability after the rain stopped,pore water pressure and volume moisture content down slowly,and the matrix suction restoration;③The embankment safety coefficient reduced obviously Under the influence of rainfall infiltration,because of the rain the permeability after the rain stop,the safety factor will be recovery under a certain degree.

关 键 词：路堤边坡 降雨入渗 地下水位 安全系数 

分 类 号：U416.14[交通运输工程—道路与铁道工程]