摘要
在役桥梁桩基长期受携砂水流冲刷作用,冲蚀磨损范围逐渐扩大,导致桩基结构出现不同程度的损伤,进而降低桥梁的耐久性与安全性。为研究冲蚀对桥梁桩基的影响,该文以安康市汉江一桥为研究对象,采用ANSYS FLUENT软件对桩基进行三维数值模拟,分析不同条件下冲蚀磨损在桩基上的分布特征及规律。结果表明:①冲蚀磨损区域主要集中于桩基承台迎流面、桩身与承台接头处及桩身两侧;承台背流面与桩身背流面的磨损区域较小。泥砂对桩基的冲蚀作用以冲击和切削为主;②在相同含砂量条件下,泥砂粒径越小,桩基冲蚀磨损面积越大;水流流速、泥砂粒径、含砂量及桩径的增大均会提高冲蚀率,其中水流流速的影响最为显著。研究结果可为在役桥梁桩基的加固设计与施工提供参考。
Bridge pile foundations in service are subjected to long-term scour erosion caused by sediment-laden water flow,leading to a gradual expansion of the eroded and worn areas.This in turn results in varying degrees of damage to the pile foundation structure and reduces the durability and safety of the bridge.In order to study the impact of scour erosion on bridge pile foundations,this study took the Hanjiang No.1 Bridge in Ankang City as the research object.The ANSYS FLUENT software was used to conduct three-dimensional numerical simulations of the pile foundation and analyze the distribution characteristics and patterns of scour erosion under different conditions.The results show that:①Scour erosion areas are mainly concentrated on the upstream surface of the pile cap,the joint between the pile and the cap,and both sides of the pile shaft;the downstream surface of the cap and the downstream side of the pile shaft experience less erosion.The erosion effect of sediment on the pile foundation is mainly due to impact and cutting;②Under the same sediment concentration,smaller sediment particle size results in a larger scour erosion area.Increases in flow velocity,sediment particle size,sediment concentration,and pile diameter all contribute to a higher erosion rate,among which flow velocity has the greatest influence.The research results can provide a reference for the design and construction of bridge pile foundations in service.
作者
王上
米江川
陈明涛
宋丹
张乔
张勇
王微笑
WANG Shang;MI Jiangchuan;CHEN Mingtao;SONG Dan;ZHANG Qiao;ZHANG Yong;WANG Weixiao(Ankang City Transportation Bureau,Ankang,Shaanxi 725000,China;Ankang Highway Bureau,Ankang,Shaanxi 725000,China;The Engineering Design Academy of Chang’an University Co.,Ltd.,Xi’an,Shaanxi 710064,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)
出处
《中外公路》
2025年第3期153-162,共10页
Journal of China & Foreign Highway
基金
陕西省交通运输厅科技项目(编号:22-24K)
安康市工业科技攻关项目(编号:AK2022-GY-12)。
关键词
桥梁桩基
水流冲刷
冲刷侵蚀
群桩
数值模拟
bridge pile foundation
water flow scour
scour erosion
group pile
numerical simulation
