临策铁路戈壁段路堤二维风速流场特征研究  

Research on the Characteristics of Two-dimensional Wind Velocity Field of Embankment of Gobi Section of Linhe-Ceke Railway

作　　者：姚立强[1] 左合君[1] 李钢铁[1] 刘宝河[1] 

机构地区：[1]内蒙古农业大学,呼和浩特010019

出　　处：《铁道标准设计》2013年第9期4-9,共6页Railway Standard Design

基　　金：内蒙古自然科学基金(2010MS0612);内蒙古农业大学科技创新团队资助计划(NDTD2010-11)

摘　　要：利用HOBO风向风速自动记录仪对临策铁路戈壁段4、8 m和12 m高度的路堤进行野外风速流场观测,结合数值模拟和趋势面分析的方法,研究路堤高度和旷野风速的变化对风速流场的影响以及路堤沙害发生的可能性。研究表明:随着路堤高度和旷野风速的增大,路堤风速流场涡流区和弱风区逐渐向路堤背风侧扩大;路堤迎风坡坡脚、背风坡路肩和背风坡坡脚处流沙堆积可能性较大;8 m高度路堤在路面最易形成沙害,建议戈壁地区铁路路堤高度的选取不宜超过8 m;路堤对风速流场的阻碍作用及路堤沙害发生的可能性与路堤高度呈正相关,与旷野风速呈负相关。研究结果对铁路路基断面设计和高程确定及沙害防治具有一定借鉴意义。To make clear the influence on the wind velocity field caused by different embankment heights and by different wind speeds in open country, as well as to make clear the likelihood of sand hazard, the observation on wind velocity field in open country for the embankment respectively with a height of 4m, 8m and 12m was conducted on the Gobi section of Linhe-Ceke Railway by using wind direction and speed recorder HOBO. The results of the research show that the eddy current zone and weak wind zone of the wind velocity field of the embankment will expand gradually toward the leeward side as the embankment height or wind speed in open country increases. It is most likely to deposit quick sand at the windward slope toe, leeward slope shoulder and leeward slope toe of the embankment. The sand hazard is most easily formed at the road surface of the embankment with a height of eight meters, so the height of railway embankment in Gobi should not be more than eight meters. Moreover, the embankment＇s resistance effect against the wind velocity field, and the likelihood of sand hazard are all correlated positively with the height of embankment, and are correlated negatively with the wind speed in open country. These results can be useful for railway embankment cross-sectlon design, elevation determination and sand prevention and control.

关 键 词：临策铁路 戈壁 路堤 风速流场 

分 类 号：U213.154[交通运输工程—道路与铁道工程]