不同冰盖条件下导流体对桥墩局部冲刷防护作用研究  

Study on the anti-scour protective effect of diversion body on local scouring around pier under different ice-covering conditions

作　　者：贾小波 牟献友[1] 高鹏程 李扒拴 JIA Xiao-bo;MOU Xian-you;GAO Peng-cheng;LI Ba-shuan(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot O10018,China;Hohhot Togtoh County Rural Revitalization Coordinated Development Center,Togtoh 010200,China)

机构地区：[1]内蒙古农业大学水利与土木建筑学院,内蒙古呼和浩特010018 [2]呼和浩特市托克托县乡村振兴统筹发展中心,内蒙古托克托010200

出　　处：《泥沙研究》2024年第1期65-72,80,共9页Journal of Sediment Research

基　　金：国家自然科学基金项目(52379014,52169017,51969020);国家自然科学基金联合基金项目(U23A2012);内蒙古自然科学基金重点项目(2022ZD08)。

摘　　要：基于桥墩基础的减冲防护原理,设计了一种稳定性高的防冲装置—导流体。为探究导流体对桥墩局部冲刷的防冲效果,在不同流速及覆盖条件下,采用不同形状的导流体进行模型试验。通过分析冲刷特性、最大冲坑深度、下潜流水力特性、冲坑体积和冲坑面积,选出最优形状和最佳安装位置。试验结果表明:当导流体底边高8 cm、安装位置在墩前2d时,防冲效果最好;当流速为0.32 m/s时,安装导流体可使桥墩最大冲深减小59.3%,冲坑体积减小76.1%,冲坑面积减小79.0%,下潜流流速及紊动强度明显减小。通过敏感性分析得出安装距离是影响导流体防冲效果的主要影响因素。Based on the anti-scour protection principle of pier foundation,a new anti-scour structure with high stability,the diversion body,is designed.In order to explore the anti-scour effect of diversion body on local scour of cylindrical pier,a series of physical model tests is carried out with different shapes of diversion body under different flow rates and covering conditions,and the optimal shape and installation position are selected by analyzing scour characteristics,maximum scour depth,hydraulic characteristics of the underlying flow,scour hole volume and scour hole surface area.The test results show that:when the base height of the diversion body is 8 cm and the installation position is 2d,the anti-impact effect is the best.As the flow velocity is 0.32 m/s,the maximum impact depth,impact volume and impact surface area of the scour hole around the pier can be reduced by 59.3%,76.1%and 79.0%,respectively,compared with unprotected,and the turbulence intensity of the underlying flow can be significantly reduced.It is also found that the installation distance is the main factor affecting the anti-scour effect by the sensitivity analysis.

关 键 词：导流体 最大冲坑深度 冲坑体积 冲坑面积 下潜流水力特性 敏感性分析 

分 类 号：TV131.6[水利工程—水力学及河流动力学] U442.3[建筑科学—桥梁与隧道工程]