坡度及防雪栅对路堤周边流场影响的数值研究

NUMERICAL STUDY ON THE INFLUENCE OF SLOPE AND SNOWFENCE ON THE FLOW FIELD AROUND EMBANKMENT

路堤边坡坡度是影响路堤周边流场的重要因素,防雪栅是道路风吹雪灾害中常见的防雪措施,通过改变边坡坡度以及在路堤的迎风侧合理设置防雪栅,有利于改善路堤周边的积雪分布。采用数值模拟方法研究不同边坡坡度的路堤的流场特性,分析路堤积雪分布,在此基础上,在路堤迎风侧设置防雪栅研究不同层数防雪栅对路堤的挡雪效果。结果表明:路堤的绕流场特性与边坡坡度密切相关,气流流过路堤形成的风速减弱区范围与边坡坡度成正比;通过在合理位置设置合理参数的防雪栅,可以改善路堤周边流场并减弱风雪流从而起到阻雪的效果。

The side slope of an embankment is an important factor affecting the flow field around the embankment.A snow-fence is a common snow prevention measurement in the road blowing snow disaster.It is beneficial to improve the distribution of snow accumulation around an embankment by changing the slope of the embankment and reasonably setting up the snow-fence in the windward.The flow field characteristic of an embankment with different slopes was studied using a numerical simulation method and the snow distribution of the embankment was analyzed.On the basic of this,the snow prevention effect of the snow-fence in different rows for the embankment was studied by installing snow-fences on the windward of the embankment.The result shows that the characteristics of the flow around the embankment are closely related to the slope and the range of wind speed weakening area formed due to the flow passing through the embankment is proportional to slope.By setting snow-fences with a reasonable parameter in a legitimate position,the flow field around the embankment can be improved and the snow drifting can be weakened to come into the effect of snow prevention.