堤防道路路基湿度场演变规律数值计算

为了解堤防道路路基湿度的变化规律,运用地下水渗流分析软件对不同水位和加铺路面结构后在一定降雨条件下的路基湿度进行数值计算。结果表明,水位高低对下部路基湿度的影响显著,路基受水位影响分为湿度饱和区和湿度渐变区。湿度饱和线随临水侧的水位升高而升高,临水侧路基湿度较背水侧大。降雨对上部路基影响显著,路基的湿度随着降雨历时而增加。这种湿度增加的趋势随着临水侧水位的降低在路基表层尤为显著。堤顶覆盖路面后,降雨主要影响裸露堤顶下的路基湿度,而对行车道下的路基湿度影响较小。

Numerical study on humidity field evolution law of levee road subgrade

In order to find out the humidity variation law of levee road subgrade, the road subgrade with various water levels and after placing pavement under a certain rainfall condition is numerically calculated with SEEP/W analysis software. The result shows that the humidity of the underlying subgrade is significantly impacted by the range of water level, and then the subgrade under the impact from water level can be divided into the humidity-saturated zone and the humidity-gradient zone. The humidity saturated line rises along with the rise of the water level at the water-side, while the humidity of the water-side subgrade is higher than that at the land-side. The impact from rainfall is remarkable on the upper subgrade, while the humidity of the subgrade is increased along with the increase of the rainfall duration. The trend of this kind of humidity increase is especially significant for the surface of the subgrade along with the decrease of the water level at the water-side. After the pavement is made upon the levee crest, the humidity of the subgrade under the exposed levee crest is mainly impacted by rainfall, which has less impact on the humidity under the pavement.