路堑风吹雪的观测与研究

研究目的:铁路风吹雪灾害中路堑是最易引起雪害的断面型式,有效避免和减轻路堑遭受风吹雪灾害,研究路堑断面型式与风吹雪的关系,对铁路雪害防治具有重要的理论意义与现实意义。研究结论:本文结合现场观测和有限元模拟分析结果,得出路堑内风速总是较小,最易产生风吹雪堆积,路堑越深,在上风向堑坡坡脚处形成的涡旋减速区规模和范围越大,边坡上的临界储雪量越大,风雪流灾害发生的进程相对越慢,边坡越缓,形成的涡旋减速区规模和范围就越小,较缓的边坡有利于减轻路基面风吹雪积雪灾害,但较缓的边坡相应的工程量成倍增大,从工程灾害安全与经济效益两方面来考虑,边坡坡率的选择应同时考虑其他雪害防治措施等因素。

Observation and Research on Cutting Snow -drift

Research purposes: The cutting is the section pattern that the most easily causes the snow-drift disaster in the railway snow-drift.To research the relation between the cutting pattern and the snow-drift to effectively avoid or relieve the snow-drift disaster has the theoretical and real significances for control of the snow-drift disaster. Research conclusions:From the f results of field observation and the simulation analysis with finite element method it is concluded in this paper that the wind speed is small in the cutting,but it the mostly easily causes the wind snow drift.The deeper the cutting is,the larger the scale and scope of scroll deceleration zone are at the toe of the cutting slope in the upper wind direction,the bigger the critical storage of snow on the slope is,the relatively slower the process of the blizzard flow disasters is.The more slowly the slope is,the smaller the scale and scope of scroll deceleration zone are.The moderate slope can reduce the snow-drift of subgrade surface,but it doubles the engineering quantity.To consider two aspects of engineering security and economic benefits,the rate of slope should be chosen by taking other snow damage control measures into account.