不同降雨入渗条件下路堑边坡渗流特性研究

Study on seepage characteristics of subgrade slope under various rainfall infiltration conditions

为研究不同降雨条件下雨水入渗对路堑边坡渗流特性的影响,采用Geo-studio软件对实际工程路堑边坡模拟多种极端降雨的边坡渗流,分析边坡内部孔隙水压力、体积含水率、暂态饱和区等变化规律。研究结果表明:不同降雨入渗条件下,边坡内部较高处其孔隙水压力及体积含水率更易消散,且积水作用会使得边坡坡脚及各级台阶处出现极值;暂态饱和区在降雨-停雨全过程中,其面积大小呈现"凸"型分布;由于高边坡处的径流补充,导致低边坡处的各项指标减少较慢。

In order to study the influence of rainfall infiltration on the seepage characteristics of road graben slopes under different rainfall conditions,the Geo-studio software was used to simulate the seepage characteristics of road graben slopes under various extreme rainfall conditions.The change of pore water pressure,volumetric water content and transient saturation zone of slope was analyzed.The results show that as the different rainfall infiltration conditions,the pore water pressure and volumetric water content are dissipated easily at the higher elevation of the slope,and the extreme values caused by the ponding effect appear at the position of the slope foot and the steps of all levels.The area of the temporary saturation zone is characterized by convex distribution during the whole process of rainfallstopping.The indicators at the low side of slope decrease slowly resulted from the runoff replenishment at the high side of slope.