公路路堑挡雪墙防雪效果预测与设计参数优化

为了对延崇高速路堑风吹雪雪害问题进行防治，首先采用CFD数值模拟方法研究了挡雪墙防护措施下路堑积雪分布规律，其次基于正交试验方法建立了路堑挡雪墙防雪效果预测模型，最后优化了金家庄螺旋隧道口路堑挡雪墙设置方案。研究结果表明，路堑边坡比对挡雪墙防雪效果的影响程度最大，其次是挡雪墙高度、路堑深度、风速、风速-挡雪墙高度组合、挡雪墙布置距离和挡雪墙高度-挡雪墙布置距离组合，而风速-挡雪墙布置距离组合的影响程度最小。金家庄螺旋隧道口路堑风吹雪挡雪墙最优高度为6 m、挡雪墙和路堑之间最优距离为90 m。设置挡雪墙时路堑路段积雪体积分数减少了12.36%，证明了优化挡雪墙的布置可起到较好的防雪效果。因此，研究结果可为风吹雪挡雪墙的设置提供一种便捷快速的方法和科学依据，为路堑风吹雪灾害防治提供理论参考。

Study on snow-prevention effect prediction and design parameter optimization of snow retaining wall of expressway in the form of cutting

To prevent and control the snow damage problem on the cutting of Yanchong expressway,this paper firstly studied the snow distribution law of cutting under protective measures of snow retaining wall by the CFD numerical simulation,then established the prediction model of snow prevention effect of cutting snow retaining wall by the orthogonal test method,and finally optimized the setting scheme of cutting snow retaining wall at the entrance of Jinjiazhuang spiral tunnel.The results show that the cutting slope ratio has the greatest impact on the anti-snow effect of snow retaining wall,followed by the snow retaining wall height,cutting depth,wind speed,combination of wind speed and snow retaining wall height,snow retaining wall layout distance and combination of snow retaining wall height and snow retaining wall layout distance,while the combination of wind speed and snow retaining wall layout distance has the least impact.The optimal height of snow drift retaining wall at the entrance of Jinjiazhuang spiral tunnel is 6 m,and the optimal distance between retaining wall and the cutting is 90 m.When the snow retaining wall is set,the distribution of snow volume fraction reduces by BF]12.36%BFQ],which proves that optimizing the layout of snow retaining wall can play a better snow prevention effect.The research can provide a convenient and rapid method and scientific basis for the setting of snow drift snow retaining wall,and provide a theoretical reference for the prevention and control of cutting snow disaster.