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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.
Based on the sediment concentration observation system of K1476 + 875 ~ K1477 + 000 near the thirteen bus stations in the Baili wind zone of the Lan-Xin Railway, the observation on the sand-control function of the sand-blocking wall in this section during 2009 was analyzed.The results show that: The gusts in this area are dominated by the 9th and 10th stages. Sediment concentration is closely related to the microtopography. Sediment concentration decreases exponentially along the height direction. The presence of surface structures changes the flow field of sandstorms. Sand wall height increases and decreases, increasing the height of the sand block wall is a significant effect of sand. The embankment and cutting joints sediment concentration is large, the design of the retaining wall should be taken seriously, it is recommended to strengthen the sand control measures The results of the study will provide some reference and reference value for the second line of Lanxin to be built, and will be instructive for improving the theory and practice of wind and sand flow prevention and control in Baili area.