Abstract:In order to avoid the problem of sand damage on desert highways, relying on the Uma Desert Expressway Sand Prevention and Control Project, around the sand conveying concept of "sand conveying section", based on the principle of wind and sand movement and the principle of computational fluid dynamics (CFD) digital simulation, the influence of the location and size of sand conveying structure on the characteristics of subgrade airflow field and sand accumulation is analyzed. The research results show that when the sand conveying structure is 5 m away from the subgrade, the overall subgrade is least affected by wind erosion, and the amount of sand at the toe of the slope and the pavement is minimum. When the sand conveying structure is 3m away from the subgrade, the leeward side of subgrade has the least sand accumulation. When the width of the sand conveying structure is 9 m, the wind erosion of the subgrade toe and the slope surface is the smallest. When the width of the sand conveying structure is 6 m, the wind erosion of the roadway is the least. At the same time, when the sand conveying structure is grade 3 and the width is 9 m, the sand conveying pressure in the sand conveying ditch and the accumulation of sand particles at the wind dike can be effectively alleviated, but the width of the sand conveying structure has little effect on the sand accumulation of the subgrade. In general, based on the different terrains and different needs, the parameters of sand conveying structures can be set according to local conditions for sand prevention and control in practical projects.
