风向夹角对高速公路路堤风吹雪影响研究

The Influence of the Angle between Road Trend and Wind Direction on Snow Drift on Expressway Embankment

对高速公路路堤周围流场进行三维数值模拟,分析风向夹角对路堤特征点风速和风速流场的影响,得到路堤周围积雪分布规律,完善积雪形成机理,为高速公路选线设计提供理论参考。结果表明:风向夹角变化对路堤特征点风速变化幅度有不同程度影响,随风向夹角增大,路堤周围积雪区域整体为增加趋势,风向夹角为75°时路堤两坡脚处积雪区域最大,风向夹角为90°时路面积雪区域最大。在风吹雪灾害频发地区进行高速公路选线设计时,应减小公路与主风向之间夹角,尽可能使风向夹角小于75°,减少风吹雪灾害的发生。

In this paper,the three-dimensional numerical simulation of the flow field around the expressway embankment is carried out,and the influence of the wind direction angle on the wind speed and flow field of the characteristic points of the embankment is analyzed.The snow distribution law around the embankment is obtained,and the snow formation mechanism is improved,which provides a theoretical reference for the design of expressway route selection.The results show that the change of wind direction angle has different effects on the wind speed change range of the characteristic points of the embankment,with the increase of wind direction angle,the snow area around the embankment increases as a whole.When the wind direction angle is 75°,the snow area at the foot of the two slopes of the embankment is the largest.When the wind direction angle is 90°,the snow area on the road surface is the largest.When designing highway route selection in areas with frequent wind and snow disasters,the angle between the highway and the main wind direction should be reduced,and the angle between the wind direction should be less than 75°as much as possible to reduce the occurrence of snow drifting disasters.