季节降雨对非饱和路基水分迁移规律影响的研究

Study on Influence of Seasonal Rainfall on Law of Moisture Migration in Unsaturated Subgrade

运用有限元软件对佛开高速路面结构进行非饱和渗流数值模拟,研究季节性降雨对路基水分迁移规律的影响.结果表明：季节降雨对路堤含水量的影响集中在边坡和中央绿化带附近区域,对两者之间的区域影响较小,影响区范围在路堤中上部距离路堤边坡和中央绿化带约3～4m以内区域.该范围内切线模量值变化最大幅值出现于路堤顶部中央绿化带,平均变化幅值随路堤高度下降而减小.在降雨影响范围内,路堤压实度为96％和94％区域的切线模量随降雨强度和降雨持续时间的增大而降低.

With finite element software, the unsaturated seepage in the pavement structure of Foshan-Kaiping Highway was simulated numerically, through which the influence of seasonal rainfall on law of moisture migration in subgrade was studied. The result shows that the influence of seasonal rainfall on water content in embankment is major in the slope and the area near the central greenbelt, but minor in the area between each other, and the affected range is in the upper middle part of the embankment 3 -4 m away from the slope and the central greenbelt. The tangential modulus has its maximum magnitude of variation at the central greenbelt on top of the embankment with the average magnitude of variation decreased with increase of the height of embankment. Within the range affected by rainfall, as the intensity and duration of rainfall increases, the tangential modulus of the area having 96 % and 94 % compactness of embankment decreases.