河岸边坡对抛投沙袋落点规律影响的试验研究

Experimental study on influence of riverbank slope on law of thrown sandbag landing point

通过概化水槽试验,分析了有河岸边坡情况下开底驳船和翻板船抛投沙袋的漂移、偏移落距和落点范围规律,并研究了不同抛投方式的影响。试验结果表明:河岸边坡的存在会导致沙袋发生滑动或滚动,增加沙袋的漂移和偏移落距,且坡度越大,沙袋在顺水流方向的落点越分散;沙袋平均漂移落距随流速的增大而增大,流速较大时,边坡坡度变化对沙袋漂移落距影响较小,流速较小时,开底驳船抛投时沙袋平均漂移落距随边坡坡度的增大而增大,翻板船抛投沙袋在顺水流方向的落点越集中;开底驳船抛投方式比翻板船抛投方式的沙袋落点更分散,但落点范围相差不大。

The drift distance,offset distance,and landing range of sandbags thrown by bottom-opening barges and flipper boats in the presence of riverbank slopes are analyzed through generalized flume experiment.The influence of different throwing methods is also investigated.The experimental results show that the existence of the riverbank slope will cause the sandbags to slide or roll,increasing their drift and offset distance.Moreover,as the slope gradient increases,the landing points of the sandbags become more scattered in the downstream direction.The average drift distance of sandbags increases with the flow velocity.When the flow velocity is high,the variation in slope gradient has a relatively small impact on the drift distance of the sandbags.However,when the flow velocity is low,the average drift distance of the sandbags thrown by the bottom-opening barges increases with increasing slope gradient,while the landing points of the sandbags thrown by the flipper boats become more concentrated in the downstream direction.The throwing method of bottom-opening barges results in more dispersed landing points compared to flipper boats,although the difference in landing range between the two throwing methods is insignificant.