防雪栅与路基间距对路基积雪分布影响规律的数值模拟研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (6) : 227-234.

论文

刘庆宽1,2,3，何书勇3，贾娅娅1,2,3，李海飞3，冯耀恒3，李飞强3

作者信息 +

Numerical simulation on the influence of the distance between snow fence and subgrade on the snow distribution on subgrade

LIU Qingkuan1，2，3, HE Shuyong3, JIA Yaya1,2,3, LI Haifei3, FENG Yaoheng3, LI Feiqiang3

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文章历史 +

摘要

防雪栅是目前道路风吹雪灾害地区主要的防护设施，该研究结合数值模拟和现场实测方法，研究防雪栅与路基的布置间距对路基周围积雪分布的影响规律，进而分析积雪堆积机理。结果表明：数值模拟结果与现场实测结果有很好的对应关系，验证了结果的正确性；随着路堤与防雪栅间距的增大，路堤两个坡脚处的风速减小区范围均呈先增大后减小的趋势。路堤表面各部分的剪切速度均呈先增大后减小又增大的趋势，透风率为60%的防雪栅与路堤的最不利组合间距为16.67倍的防雪栅高度；随着路堑与防雪栅间距的增大，路堑内部积雪不易消除，因此防雪栅对路堑的挡雪效果不佳；运用剪切速度能够清晰地判断路基表面的积雪堆积与侵蚀，建议在风吹雪灾害频发地区修建铁路前可先采用该方法对工程表面的积雪堆积与侵蚀进行预判断，可合理确定工程中防雪栅布置的位置。

Abstract

Snow fence is currently the main protection facility in road snowdrift disaster areas.Numerical simulation and field measurement were combined to study the influence of the distance between the snow fence and subgrade on the distribution of snow around the subgrade, and then the mechanism of snow deposition was analyzed.The results show that there is a good correspondence between the numerical simulation results and the field measurement results, which verifies the correctness of the results.The tendency is that as the distance between the embankment and snow fence increases, the wind speed reduction areas at the two slope toes of the embankment firstly increase，and then decrease.The shear velocity at each part of the embankment surface firstly increases, then decreases and finally increases.The most unfavorable combined distance between the snow fence with a porosity of 60% and the embankment is 16.67 times the height of the snow fence.As the distance between the cutting and the snow fence increases,it is not easy to eliminate the snow inside the cutting, so the snow fence has a poor snow-blocking effect on the cutting.The application of shear velocity can clearly judge the snow deposition and erosion on the subgrade surface.It is suggested that the method can be used to pre-judge the snow deposition and erosion on the engineering surface before building a railway in areas with frequent snowdrift disaster, which can reasonably determine the location of the snow fence in the project.

导出引用

刘庆宽1,2,3，何书勇3，贾娅娅1,2,3，李海飞3，冯耀恒3，李飞强3. 防雪栅与路基间距对路基积雪分布影响规律的数值模拟研究[J]. 振动与冲击, 2021, 40(6): 227-234

LIU Qingkuan1，2，3, HE Shuyong3, JIA Yaya1,2,3, LI Haifei3, FENG Yaoheng3, LI Feiqiang3. Numerical simulation on the influence of the distance between snow fence and subgrade on the snow distribution on subgrade[J]. Journal of Vibration and Shock, 2021, 40(6): 227-234

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