Numerical Simulation of Sand Deposition and Erosion Characteristics around Wind-break Wall with Openings along Lanzhou-Xinjiang High Speed Railway Line
Despite the effective role of the wind-break wall on the subgrade in wind prevention,the obstructing effect of the wall has caused serious sand accumulation hazards.Based on the Fluent Euler two-fluid model,a numerical simula-tion study was conducted on the two-phase flow characteristics of wind and sand around the existing wind-break wall with openings in the lower part of the wall along the Lanzhou—Xinjiang high speed rail line,obtaining the flow field distribu-tion around the wind-break wall and the sand deposition and erosion features.The results show that with the increase of the incoming wind speed,the vortex intensity at the foot of the windward side of the embankment gradually weakens until it disappears.With the increase of the incoming wind speed,the overall position of the vortex on the leeward side of the embankment moves to the leeward side,and the increase of vortex volume results in an increase in the reverse erosion area of sand particles.The sand deposition on the windward slope gradually decreases with the increase of the incoming wind speed,while the sand erosion gradually increases.With the increase of wind speed,the erosion area gradually ap-pears on the north railway,while the wind speed has little effect on the change of the depositional erosion area on the south railway.In areas with strong winds,the surface conditions on the windward direction of the line should be inspec-ted when installing the wind-break wall.With loose surface and abundant sand source,sand prevention and control measures should be taken at the same time to achieve the purpose of mitigating the sand accumulation hazards of the line.
wind-break wall with openingswind and sand flowsand depositionsand erosionnumerical simulation
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