铁路沿线联合沙障阻风固沙机理的数值模拟研究  

Numerical Simulation Study on the Wind Prevention and Sand Fixation Mechanism of Combined Sand Barriers along the Railway Line

作　　者：刘畅 王海龙 孙婧 LIU Chang;WANG Hailong;SUN Jing(School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050000,China;Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Zhangjiakou 075000,China;Hebei Innovation Center of Transportation Infrastructure in Cold Region,Zhangjiakou 075000,China)

机构地区：[1]石家庄铁道大学交通运输学院,河北石家庄050000 [2]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000 [3]河北省寒冷地区交通基础设施工程技术创新中心,河北张家口075000

出　　处：《铁道学报》2023年第7期178-184,共7页Journal of the China Railway Society

基　　金：河北省重点研发计划(20373802D);河北省高校2022年基本科研业务费(2022CXTD01)。

摘　　要：目前铁路上常见风沙病害即为风蚀和沙埋,为保证铁路运输安全,基于欧拉-拉格朗日离散模型,对前期已确定设计参数的由透风栅栏及固沙砖沙障的联合沙障优化措施对路堤周围风沙流场积沙分布的防护效果进行研究分析。结果表明:由于透风栅栏的作用,其后风速降低约50%,部分风沙流受阻抬升导致流场4.5 m以上形成风速加速区;透风栅栏与固沙砖沙障联合作用,在距地面近2 m处风速小于5 m/s,有利于沙粒的沉降,路堤上已沉积在表面的沙粒也不易再次移动;路堤顶面风速降低23.5%,更有利于平稳输导风沙流,减少人工清沙频率,提高防沙效益;联合沙障优化措施在参考风速为分别为5.93、10.38、18.67 m/s时均可有效净化来流风沙;联合沙障有效颗粒防护率可达到89%以上,针对粒径d≥0.1 mm的颗粒,3种入口风速的防护率分别为99.9%、93.6%、94.7%。The most common wind-blown sand hazards around embankments are wind erosion and sand-burying.In order to ensure the safety of railway transportation,based on Euler-Lagrange discrete phase model,the protective effect of the combined sand barriers of fence and sand-brick sand barrier on the sand accumulation distribution of the wind-sand flow field around the embankment has been studied and analyzed.The results show that the subsequent wind speed is reduced by about 50%due to the effect of the fence,and part of the wind-blown sand is blocked and uplifted,resulting in the formation of wind speed acceleration zone above 4.5 m in the flow field.The wind speed is less than 5 m/s at 2 m from the ground,which is conducive to the settlement of sand grains.The sand grains deposited on the surface of the embankment are not easy to move again.The wind speed at the top of the embankment is reduced by 23.5%,which is more conducive to the smooth transport of sand flow,reduce the frequency of manual sand cleaning,and improve the efficiency of sand control.When the reference wind speed is 5.93,10.38 and 18.67 m/s,the combined sand barriers can effectively purify the incoming wind-blown sand.The effective particle protection rate of the combined sand barrier can reach more than 89%.For the particle diameter d≥0.1 mm,the protection rate of the three inlet wind speed is 99.9%,93.6%,94.7%,respectively.

关 键 词：风沙流 铁路路堤 防风固沙 数值模拟 

分 类 号：U216.413[交通运输工程—道路与铁道工程]