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根据河道桥墩的冲刷机理,本文提出了一种护圈与人工草相结合的防冲刷措施。通过物理模型试验,研究了单向流作用时,桥墩安装护圈情况下,不同密度,不同间距的人工草对桥墩局部冲刷的影响。研究发现,将单一防护效果较弱的护圈和人工草相结合,在清水冲刷时可以实现无冲刷,动床冲刷时冲刷深度最少可降低40%以上。此外根据试验结果拟合了冲刷坑深度与流速和间距关系的经验公式。
According to the scouring mechanism of river pier, this paper puts forward a kind of anti-scouring measures combined with artificial grass. Through the physical model test, the effect of artificial grass with different densities and different pitches on local scour of bridge pier under the condition of unidirectional flow was studied. The study found that the combination of a single guard ring and artificial grass with weak protective effect can achieve no flushing when washed with fresh water and the flushing depth can be reduced by at least 40% when moving bed flushing. In addition, based on the experimental results, the empirical formula of the relationship between the depth of scouring pit and the flow velocity and spacing is fitted.