Highways in sandstorm areas are subject to wind erosion and sand burial hazards all the year round.The prevention and control of road sandstorms generally start from the aspects of plant sand control,chemical sand control and engineering sand control.Based on the characteristics of mechanical sand barriers for industrial production,easy construction,detachable and reusable,they are widely used in engineering sand control.At present,the research on mechanical sand barriers mostly focuses on the determination of the height,porosity,geometric shape and other parameters of single sand barriers,and there are few studies on the setting mode of double sand barriers.In this dissertation,the road is protected by the installation of double sand barriers on the side of the road.The angle between the sand barrier and the ground is used as the resear ch element.The indoor wind tunnel simulation test is carried out to explore the maximum wind protection.In this dissertation,by doing an indoor wind tunnel simulation experiments,we setting up double sand barriers on the side of the highway as a condit ion,to explore how the inner angle between the sand barrier and the ground can be arranged to maximize the benefits of wind resistance and sand resistance to temporarily replace the declining Salix psammophila protective belt.The research results are as follows :(1)At low wind speeds at the same angle,the double sand barriers have better wind-proof effects,and with the increase of wind speed,the difference in windproof efficiency between angles is continuously reduced.Under the same wind speed,when the double sand barriers are arranged at 45°,the friction speed and the reduced sand transport rate are both the largest,and the sand barriers have the strongest ability to inhibit the movement of sand near the surface.(2)The roughness after the double sand barrier gradually decreases as it moves away from the Salix psammophila protective belt.Under the same wind speed,when the sand barrier is set to 45°,the near-surface roughness is larger.When the wind speed increases,although the roughness value between the angles changes,the difference between the roughness is reduced by the angle.At higher wind speeds,the sand barrier is in the three angle setting modes.There is insignificant difference in the protection benefits of the near-surface.(3)When the double sand barrier is set at 45°,the wind speed near the surface is relatively small at the height of 10 mm and 25 mm near the surface of the windward slope angle,the windward slope shoulder and the leeward slope foot.At the shoulder of the leeward slope,less eddy currents are generated near the surface.At the center of the embankment,the wind speed is relatively high,and the road area has an obvious effect of dredging sand.(4)The installation of double sand barriers eases the wind-sand movement near the surface,and the roads suffering from wind-eroded sand burial can also be well improved.The analysis of the comprehensive test results shows that when the elevation angle of the double sand barrier is set to 45°,the wind and sand resistance benefit is the best,which is the optimal setting mode. |