沙漠地区道路涵洞周围流场规律及积沙特征研究

涵洞作为沙漠地区道路工程路基的重要组成部分之一,是保障道路安全的重要基础设施。但沙漠地区道路涵洞较易发生风沙灾害,故对其进行系统全面研究非常必要。通过对不同来流风速大小和不同来流方向下涵洞进行三维数值模拟,对比分析不同风速、不同来流方向下的涵洞周围积沙特征,并总结相关结论。研究结果和结论:对比不同来流方向下的涵洞流场特征,得出来流与涵洞夹角为20°时涵洞对洞前洞后流场影响最大,洞前有大面积增速区,洞后速度下降最为迅速。对比不同来流大小及方向下的涵洞周围积沙特征,可知随来流风速增大涵洞前积沙先增大后减少;洞腔内部随风速增大积沙会有所增多;洞后积沙随风速增大会明显增加。同一风速下夹角增大洞前积沙明显增多,且夹角越大洞前积沙横移越明显;洞后积沙随夹角增大会明显减小。

Study on Flow Field around Culvert of Desert Road and Characteristics of Sand Accumulation

The culvert is one of the important parts in road engineering and an important infrastructure to ensure the safety of the road. Because the desert culvert is more prone to wind-sand disaster,it is necessary to carry out a systematic and comprehensive research on it. The threedimensional numerical simulation of the culvert under different inflow velocity and direction is carried out to compare and analyze sandaccumulation characteristics around the culvert under different wind speed and different inflow direction.And relevant conclusions are summarized. Research findings and conclusions show that the comparison of the characteristics of the flow field under different flow direction demonstrates that when the angle between the flow and the culvert is 20 degree,the influence of the culvert on the flow field is maximum; there is a large area of the speedup region before the hole and velocity decreases most rapidly after the hole. The comparison of highway culvert sediment accumulation rule under different wind speed and direction shows that with the increase of wind speed,the sand accumulation in front of the culvert increases and then decreases. The sand accumulated inside the highway culvert increases with the increase of wind speed,and the sand accumulated after the hole increases significantly with the increase of wind speed. At the same wind speed,the sand accumulated before the hole increases with the increase of angle,and the greater the angle, the more obvious the sand sideway before the hole; after the hole the sand accumulation decreases with the increase of angle.