沙漠公路风沙流响应规律的平曲线半径研究  

Study on Horizontal Curve Radius in Wind-drift Sand Response Rule for Desert Highway

作　　者：李良英[1] 陶智忠 尹文华[1,4] 刘志博 倪国庆 LI Liang-ying;TAO Zhi-zhong;YIN Wen-hua;LIU Zhi-bo;NI Guo-qing(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;Ningxia Communications Construction Co.,Ltd.,Yinchuan Ningxia 750004,China;Ningxia Transportation Construction Technology Research Institute Co.,Ltd.,Yinchuan Ningxia 750004,China;Ningxia Highway Survey and Design Institute Co.,Ltd.,Yinchuan Ningxia 750001,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]宁夏交通建设股份有限公司,宁夏银川750004 [3]宁夏交建交通科技研究院有限公司,宁夏银川750004 [4]宁夏公路勘察设计院有限责任公司,宁夏银川750001

出　　处：《公路交通科技》2024年第1期54-61,共8页Journal of Highway and Transportation Research and Development

基　　金：宁夏交通运输厅科技项目(20200173)。

摘　　要：以穿越腾格里沙漠腹地的乌玛高速公路沙漠段为背景,基于Fluent欧拉双流体模型,对风沙环境下不同曲面迎风形式、不同半径的沙漠公路曲线路堤进行数值模拟,系统分析了曲面迎风形式和曲线半径对风沙流场结构的影响规律,并据此得到了沙漠公路路堤平曲线半径的建议取值范围,最后结合试验段公路路堤两侧的积沙情况,验证了数值模拟的准确性。结果表明:曲面迎风形式及曲线半径对y截面路堤流场分布影响不大;在路堤迎风侧,凸面迎风平曲线路堤对风沙流具有侧向输导作用,且侧向疏导作用强弱与平曲线半径大小构成反比关系,凸面迎风平曲线半径3000 m及以上时,输导作用不明显;凹面迎风平曲线路堤对风沙流有汇集作用,且汇集作用强弱与平曲线半径大小也构成反比关系,凹面迎风平曲线半径5000 m及以上时,汇集作用不明显;在路堤背风侧,平曲线半径越大,风速恢复区范围越小,当平曲线半径达到3000 m及以上时,风速恢复区长度不变;因此,沙漠地区平面线形应首选直线,在考虑绕避障碍物时,凸面迎风平曲线半径建议不小于3000 m,凹面迎风平曲线半径建议不小于5000 m。研究结果可为沙漠公路平面线型选取提供有效的参考依据。Taking the desert section of Wuhai-Maqin expressway,which runs through the heart of the Tengger Desert,as the study background,based on the Fluent Eulerian model,the numerical simulation of curve embankment for desert highway with different windward forms and radii under blown sand environment is carried out.The influence of windward form and curve radius of the curved surface on the wind-drift sand field structure is systematically analyzed,and the recommended value range of the horizontal curve radius of the desert highway embankment is obtained.Finally,the accuracy of the numerical simulation is verified by combining the sediment accumulation on both sides of the highway embankment in the test section.The result shows that(1)the windward form and curve radius of the surface have little influence on the flow field distribution of the y-section embankment;(2)on the windward side of the embankment,the road embankment with convexity windward horizontal curve has lateral transport effect on wind-drift sand,the strength of lateral dredging is inversely proportional to the radius of horizontal curve,and the conduction effect is not obvious when the convex windward flat curve radius is 3000 m or above;(3)the concave windward flat curve embankment has a pooling effect on the wind-drift sand,the strength of the pooling effect is also inversely proportional to the size of the flat curve radius,and the pooling effect is not obvious when the radius of the windward flat curve of concave surface is 5000 m or above;(4)on the leeward side of the embankment,the larger the radius of flat curve,the smaller the range of wind speed recovery zone,and the length of the wind speed recovery zone remains unchanged when the radius of the flat curve reaches 3000 m or above;(5)therefore,straight lines should be preferred for the horizontal alignment of desert areas,and the radius of the convex windward horizontal curve should not be less than 3000 m,and the radius of the concave windward horizontal curve should not be less than 5000 m when

关 键 词：道路工程 平曲线 数值模拟 路堤 选线 

分 类 号：U412.3[交通运输工程—道路与铁道工程]