Abstract.

The movement of sand particles and their accumulation on railway tracks are among the major problems observed in desert areas, which may impose huge maintenance and repair costs. One solution is to create a protective barrier in the vicinity of railway tracks to reduce sand deposition on these tracks. The present study introduced a triangular embankment due to its construction simplicity and low cost and compared it with a rigid wall-type barrier. At first, both models were compared in terms of the streamline and the sand mass flux with a two-phase flow of sandstorm numerical calculations. Then, the sand mass flux was measured for the rigid wall-type barrier using an experimental wind tunnel test. Moreover, the effects of wind speed, wall height, the zero-porosity barrier on the mass flux profile, and the deposition reduction of sand particles were examined after the barrier placement. Finally, the triangular embankment behavior was studied in a wind tunnel. The results revealed that the triangular embankment could increase the safe area after the barrier placement by up to 25%. Further, the triangular embankment was proven to be a permanent and cost-effective solution for protecting railway tracks in windblown sand-prone areas.

Graphical abstract

中文翻译：

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模拟和风洞试验比较沙尘暴中三角形路堤和刚性墙式屏障的性能

摘要。

沙粒的运动及其在铁轨上的堆积是在沙漠地区观察到的主要问题之一，这可能会带来巨大的维护和维修成本。一种解决方案是在铁路轨道附近创建保护性屏障，以减少这些轨道上的沙子沉积。本研究由于其结构简单，成本低廉而引入了三角形路堤，并将其与刚性墙式​​障碍物进行了比较。首先，将两种模型的流线和沙质通量与沙尘暴的两相流数值计算进行了比较。然后，使用实验风洞试验测量刚性壁型屏障的砂质量通量。此外，风速，壁高，零孔隙屏障对质量通量分布的影响，在设置障碍物之后检查了沙粒的沉积减少。最后，在风洞中研究了三角形路堤的行为。结果表明，在设置障碍物后，三角形路堤可以增加安全面积达25％。此外，事实证明，三角形路堤是永久性且具有成本效益的解决方案，用于保护风沙多发地区的铁路轨道。

图形概要