摘要
以将淖铁路沿线风沙特征为背景,基于Fluent双流体模型,对铁路路堑内部风沙流场、积沙分布特征和不同数量高立式沙障防护效果进行模拟研究。结果表明:将淖铁路沿线最大瞬时风速29.00 m/s,最大起沙风平均风速12.63 m/s,积沙粒径0.075~0.250 mm;携沙风通过路堑时会下沉至路堑内部,在路堑中形成回流效应,并在路堑坡肩处产生一个速度峰值;设置高立式沙障,沙粒在沙障附近堆积,减少路堑内部道床上沙相体积分数,减小路堑内部携沙风回流速度;双排沙障相比于单排沙障,沙相体积分数及回流速度呈明显降低。
With the background of the characteristics of wind and sand along the Jiangjunmiao—Naomaohu Railway,based on the Fluent two-fluid model,the simulation study was carried out on the wind and sand flow field inside the railway cutting,the distribution characteristics of sand accumulation and the protective effect of different numbers of vertical sand barriers.The result shows that,the maximum instantaneous wind speed along the Jiangjunmiao—Naomaohu Railway is 29.00 m/s,the average wind speed of the maximum sand wind is 12.63 m/s,and the sand particle size is 0.075-0.250 mm.When the sand-carrying wind passes through the cutting,it will sink into the inside of the cutting,form a backflow effect in the cutting,and generate a peak velocity at the shoulder of the cutting.The high vertical sand barrier is set up,and the sand particles accumulate near the sand barrier,so as to reduce the volume fraction of sand phase on the ballast bed inside the cutting and reduce the backflow speed of sand-carrying wind inside the cutting.Compared with the single-row sand barrier,the sand volume fraction and reflux velocity of the double-row sand barrier are significantly reduced.
作者
周志广
刘鑫
李子政
张秋隼
张雪东
钟顺元
沈宇鹏
ZHOU Zhiguang;LIU Xin;LI Zizheng;ZHANG Qiusun;ZHANG Xuedong;ZHONG Shunyuan;SHEN Yupeng(Rail Transit Branch,China Communications Construction Co.,Ltd.,Beijing 100088,China;CCCC Second Highway Engineering Bureau Co.,Ltd.,Xi'an 710065,China;Beijing Key Laboratory of Track Engineering,Beijing Jiaotong University,Beijing 100044,China;Zhongjiao Railway Design&Research Institute Co.,Ltd.,Beijing 100088,China)
出处
《路基工程》
2025年第1期1-7,共7页
Subgrade Engineering
基金
甘肃省科技计划项目(22YF11GA302)
中央高校基本科研业务费专项资金(2023-JBZY-026)
中交集团2021年重点研发项目(2021-ZJKJ-18)。
关键词
风沙区
铁路路堑
沙害特征
监测
回流效应
高立式沙障
防护效果
windy sand area
railway cutting
sand damage characteristics
monitoring
reflux effect
high vertical sand barrier
protective effect
