水资源与水工程学报2024，Vol.35Issue(3)：145-153,9.DOI:10.11705/j.issn.1672-643X.2024.03.17
冰盖下桥墩局部冲刷新型防冲组合结构试验研究
Experimental study on a novel anti-scouring composite structure for local erosion of bridge piers under ice-covered conditions
摘要
Abstract
The presence of the river ice cover changes the hydraulic properties around the bridge piers,resulting in increased local scour of the bridge piers.Based on moving bed scour,an indoor model test of a novel anti-scouring structure combining threaded scour-reducing cables and hooked-collar was conduc-ted under ice-covered and open flow conditions to explore the anti-scouring effect of the novel structure on local scour of bridge piers.The test results show that the novel anti-scouring composite structure changes the local erosion mode,and slows down the erosion process of the bridge pier.According to the range a-nalysis and variance analysis,the optimal novel anti-scouring composite structure is consist of a thread di-ameter of 6.0 mm,a thread angle of 15°and 3 rows of threaded cables;compared with no protection,the maximum scour depth of the bridge piers is reduced by 59.03%under rough ice-covered condition.The threaded anti-scouring cables can increase the surface roughness of the pier,which is conducive to weak-ening the undercurrent and separating the oncoming water flow in front of the pier to achieve the purpose of effective anti-scouring protection.关键词
桥墩局部冲刷/河流冰盖/防冲组合结构/螺纹式减冲索/水力特性/相对冲刷深度Key words
local scour of bridge pier/river ice cover/anti-scouring composite structure/threaded scour-reducing cable/hydraulic property/relative scour depth分类
建筑与水利引用本文复制引用
武庆泽,罗红春,牟献友,张宝森,李扒拴..冰盖下桥墩局部冲刷新型防冲组合结构试验研究[J].水资源与水工程学报,2024,35(3):145-153,9.基金项目
国家自然科学基金项目(52169017、51969020) （52169017、51969020）
内蒙古自然科学基金青年基金项目(2023QN05026) （2023QN05026）
