兰新铁路百里风区挡沙墙防沙效益研究

Research on Sand Preventing Benefit of Sand Retaining Wall in a Strong Wind Sector along Lanzhou-Xinjiang Railway

基于兰新铁路百里风区十三间房车站附近K1476＋875～K1477＋000沿线的集沙量观测系统，对2009年试验期间该处挡沙墙防沙功能的观测进行分析．结果表明：该地区大风以9、10级为主，集沙量与微地形关系密切，集沙量沿高度方向呈指数递减；地面构筑物的存在改变了风沙流场，挡沙墙上方的积沙量随挡沙墙高度增加而减小，增加挡沙墙高度则挡沙效果显著．路堤与路堑接头处集沙量较大，该处挡沙墙的设计结构应该受到重视，建议加强该地段防沙措施的构筑．研究结果对即将修建的兰新二线提供了一定的借鉴和参考价值，并对完善百里风区风沙流防治工程理论及实践具有指导意义．

Observation and analysis of the sand retaining wall＇s function in a strong wind sector along the Lanzhou-Xinjiang Railway show that the force 9 wind and force 10 wind are the chief strong wind there; the amount of sand moving is closely related to micro-topography, the sediments in original ground decreases exponentially along a vertical direction, the presence of surface structures changes the sand flow, the sediment above the sand retaining wall decreases with increasing wall, and the effect was significant if increase the wall height; a large amount of sand accumulation in the joint which connects the road embankment and cut, where the design of sand retaining wall should take seriously, and it was proposed that the building of the sand retaining should be strengthen there. What study above can provide certain reference and value for Lanzhou-Xinjiang Second-Line and have certain significance of perfecting sand drifting sci- ence in strong wind regions.