Wind-sand flow simulation and radius optimization of highway embankment under different vertical curve radius  

作　　者：LI Liangying LI Qi WANG Xu XIN Guowei WANG Zhenqiang 

机构地区：[1]School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China

出　　处：《Journal of Mountain Science》2024年第8期2533-2546,共14页山地科学学报（英文）

基　　金：The research described in this paper was financially supported by Youth Science Foundation Project’Research on Failure Mechanism and Evaluation Method of Sand Control Measures for Railway Machinery in Sandy Area’(12302511);Ningxia Transportation Department Science and Technology Project(20200173);Central guide local science and technology development funds(22ZY1QA005)。

摘　　要：It is of great practical value to explore the correlation between the vertical curve radius of desert highway and the increase of sand accumulation in local lines,and to select the appropriate vertical curve radius for reducing the risk of sand accumulation.In this study,three-dimensional models of desert highway embankments with different vertical curve radii were constructed,and Fluent software was used to simulate the wind-sand flow field and sand accumulation distribution of vertical curve embankments.The results show that:(1)Along the direction of the road,the concave and the convex vertical curve embankments have the effect of collecting and diverging the wind-sand flow,respectively.When the radius of the concave vertical curve is 3000 m,5000 m,8000 m,10000 m and 20000 m,the wind velocity in the middle of the vertical curve is 31.76%,22.58%,10.78%,10.53%and 10.44%,higher than that at both ends.When the radius of the convex vertical curve is 6500 m,8000 m,10000 m,20000 m and 30000 m,the wind velocity at both ends of the vertical curve is 14.06%,9.99%,6.14%,3.22%and 2.41%,higher than that in the middle.The diversion effect also decreases with the increase of the radius.(2)The conductivity of the concave and convex vertical curve embankments with different radii is greater than 1,which is the sediment transport roadbed.The conductivity increases with the increase of radius and gradually tends to be stable.When the radius of the concave and convex vertical curves reaches 8000 m and 20000 m respectively,the phenomenon of sand accumulation is no longer serious.Under the same radius condition,the concave vertical curve embankment is more prone to sand accumulation than the convex one.(3)Considering the strength of the collection and diversion of the vertical curve embankment with different radii,and the sand accumulation of the vertical curve embankment in the desert section of Wuma Expressway,the radius of the concave vertical curve is not less than 8000 m,and the radius of the convex vertical curve is not less t

关 键 词：Highway engineering Vertical curve Numerical simulation Embankment wind-sand flow Radius optimization 

分 类 号：U416.12[交通运输工程—道路与铁道工程]