Wind-Tunnel Studies on Sand Sedimentation Around Wind-Break Walls of Lanxin High-Speed Railway II and Its Prevention
Wind-Tunnel Studies on Sand Sedimentation Around Wind-Break Walls of Lanxin High-Speed Railway II and Its Prevention
复制标题
兰新高铁二期防风墙周边积沙风洞研究及防治
DOI：
10.3390/app11135989
复制
发表时间：
2021-07-01
影响因子：
2.7
通讯作者：
Zhang, Jie
中科院分区：
文献类型：
--
作者：
Dun, Hongchao;Xin, Guowei;Zhang, Jie
对兰新二线沿线沿着防风墙进行了研究，认为防风墙是减轻高速列车强风危害的有效措施。结果表明，戈壁沙漠内铁路防风墙沿着背风面的泥沙淤积对行车安全构成严重威胁。与现有的防沙措施没有充分考虑空气中沙粒的沉降过程不同，本研究揭示了不同地形条件下3道防风墙背风面的泥沙沉降机理。通过一系列风洞试验，测量了沙粒的水平速度、数密度、输运通量和沉降速率，发现沙粒在轨道上的水平速度先增大后减小，且在凹形路基上的峰值速度远小于凸形和平坦路基上的峰值速度。数密度和水平输沙量在凹形路基上最大，凸形路基上最小。凹型路基内的沙粒沉积速率和分布也最大，并提出了防止防风墙背风侧沙粒沉积的措施。
Wind-break walls along Lanxin High-Speed Railway II were studied and approved as effective measures to reduce strong wind damage to the high-speed trains. The results show that sand sedimentation on the leeward sides of wind-break walls along the railway within Gobi Desert could significantly threaten the operation safety of running trains. Different from the current sand sedimentation prevention measures without adequate consideration of the deposition process of airborne sand particles, this study revealed the mechanism of sand sedimentation on the leeward sides of three wind-break walls within different terrains. A series of wind-tunnel experiments were carried out to measure the horizontal velocity, number density, transport flux, and deposition rate of sand particles, and it was found that the horizontal speed of sand particles was first increased and then decreased on the railway track, and the peak speed over the concave subgrade was much smaller than those over convex and flat subgrades. The number density and horizontal sand flux were largest over the concave subgrade, and were the smallest over the convex subgrade. The sand particle deposition rate and distribution were also the largest within the concave subgrade, and some measures were also proposed to prevent sand sedimentation on the leeward sides of wind-break walls.