拟树桩群防护下并线桥墩的局部冲刷研究  

The investigation of local scouring of bridge group piers protected by quasi-stumps group

作　　者：张以升 唐伟 曹飞 姚广 齐万帅 蔡迎春[1] ZHANG Yisheng;TANG Wei;CAO Fei;YAO Guang;QI Wanshuai;CAI Yingchun(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;Henan Province Highway Engineering Bureau Group Co.,Ltd.,Zhengzhou 450052,China;Henan Puze Expressway Co.,Ltd.,Zhengzhou 450046,China)

机构地区：[1]郑州大学水利与交通学院,河南郑州450001 [2]河南省公路工程局集团有限公司,河南郑州450052 [3]河南濮泽高速公路有限公司,河南郑州450046

出　　处：《水利水运工程学报》2025年第1期145-156,共12页Hydro-Science and Engineering

基　　金：河南省重点研发与推广专项资助项目(242102321001)。

摘　　要：为降低水流对并线桥墩周围河床的局部冲刷掏蚀,提出了一种放置于桥墩上游的拟树桩群防护结构,并分别通过模型试验和数值仿真的方法研究了拟树桩群布设距离、叶面积比和宽度对桥墩周围河床冲淤特性的影响。研究结果显示,数值计算结果与试验结果具有良好的吻合度。拟树桩群能够有效降低桥墩周围的流速,削弱水流的冲刷作用,并促进悬浮泥沙的沉积,有利于并线桥墩的稳定。有防护时的悬浮泥沙沉积量和河床泥沙冲刷量分别是无防护时的3.11倍和22%。拟树桩群的布设距离、叶面积比和宽度的增加会使悬浮泥沙的沉积量明显增加,但对河床泥沙冲刷量的影响较小。To mitigate the local scour erosion around parallel piers caused by water flow,a protective structure comprised of simulated quasi-stumps group placed upstream of the piers is proposed.The impact of the deployment distance(L),leaf area ratio(S),and width(W)of the simulated quasi-stumps group on the scour and deposition characteristics of the riverbed around the piers was investigated through both model experiments and numerical simulations.The results indicate a good agreement between the numerical calculations and experimental outcomes.The simulated quasi-stumps group can effectively reduce the flow velocity around the piers,mitigate the water scouring effect,and promote the deposition of suspended sediment,which is beneficial to the stability of the parallel piers.The deposition of suspended sediment and the amount of riverbed sediment scouring with protection are 3.11 times and 22%of those without protection,respectively.Increases in L,S,and W of the simulated quasi-stumps group significantly enhance the deposition of suspended sediment,but have a minor effect on riverbed sediment scour.

关 键 词：桥墩局部冲刷 含沙水流 拟树桩群 泥沙冲淤 数值仿真 

分 类 号：TV142[水利工程—水力学及河流动力学]