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| Wind Tunnel Test on Sand-preventing Mechanism of Different Kinds of Sand-barriers |
| LI Kai-chong, XUE Chun-xiao, LIU He-ye, JIANG Fu-qiang, LIU Hui |
Northwest Research Institute Co. Ltd of CREC, Lanzhou, Gansu 730000, China)
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Abstract Abstract：Research purposes：In this paper, wind tunnel test is made to simulate wind protection and sand fixation benefits of the different kinds of sand-barriers, which include inserting-type concrete sand barrier, the sand barrier of concrete sleepers and vertical-type PE net sand barrier. The characteristic of wind speed profile, wind velocity flow field and sand transport flux under different wind speed conditions such as 8 m/s, 10 m /s, 18 m/s and 25 m /s are determined, their sand protection mechanism is studied to evaluate their protective effect.
Research conclusions：(1) There will be a low-speed air area in the pre and post of the sand-barriers , however, wind speed begins to recover gradually as the distance increases. (2) The energy dissipation of the inserting-type concrete sand barrier and the sand barrier of concrete sleepers are more efficient than that of the vertical-type PE net sand barrier,which porosities is 40%.The wind speed near the surface is close to 0 in the back of the inserting-type concrete sand barrier and the sand barrier of concrete sleepers. (3) The sand transport flux of the inserting-type concrete sand barrier and the sand barrier of concrete sleepers is less than vertical-type PE net sand barrier, the sand transport flux is close to 0, so they have a better protection effect. (4) The results of the study can offer a reference for the design of sand-barriers along the railway line.
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