Abstract: Based on wind tunnel test, the amount of sediment transport before and after different types of retaining walls along Qinghai-Tibet Railway was simulated, and the effect of different types of retaining walls on sand control was discussed. The results show that with the increase of wind speed, the sand resistance rate of each sand retaining wall shows a decreasing trend; the slab-type and concrete-type have the worst sensitivity to wind speed, the best sand control effect and the widest application range. Box type sand retaining wall has poor sensitivity to wind speed. It is recommended to be used in areas with wind speed below 18 m·s^-1. PE-mesh-type has the strongest sensitivity to wind speed. It is recommended to be used in areas with wind speed below 10 m·s^-1. The slab-type, concrete-type and box-type sand retaining wall basically show an increasing trend with the height of the sediment transport rate, the curve is a slow variation, the maximum sediment transport rate is below 20%; bell-type sand retaining wall and PE-mesh-type show a decreasing trend with the height, and the curve is of a steep drop type, and the place 6-8 cm from the surface is the turning point. The sediment transport rate above the turning point decreases sharply with the increase of the height, while the sediment transport rate below the turning point changes gently with the height, and the maximum sediment transport rate is below 50%.

Key words: Qinghai-Tibet Railway, retaining wall, resistance rate, wind tunnel test