网格结构对桥墩周围冲刷坑的促淤效果研究  

Effect of lattice structure promoting sedimentation on scour pits around piers

作　　者：赵旭东 张民曦 姚文娟[2] 乐绍林 周欢 喻国良[1] ZHAO Xudong;ZHANG Minxi;YAO Wenjuan;YUE Shaolin;ZHOU Huan;YU Guoliang(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China;CCCC Road&Bridge Special Engineering Co.,Ltd,Wuhan 430071,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海大学力学与工程科学学院,上海200444 [3]武汉二航路桥特种工程有限责任公司,湖北武汉430071

出　　处：《水运工程》2023年第7期105-112,共8页Port & Waterway Engineering

基　　金：国家自然科学基金项目(52171268)。

摘　　要：减少冲刷坑深度是桥梁设计与维护中常面临的一个重要问题。为了进一步探明促淤网格的安装位置等对桩墩局部冲刷坑促淤修复效果的影响,通过水槽试验研究促淤修复率随促淤网格安装位置、网孔大小等要素的变化特征。结果表明:促淤修复率受来流强度的影响不大,受网格的相对安装位置影响很大;为提高促淤网格的稳定性和促淤修复效果,促淤网格应安装在沙波波谷以下尽可能高的位置,以获得尽可能大的促淤容量,增大网格的促淤深度;网格的相对网孔孔径越小,网格安装位置对冲刷坑促淤修复效果的影响越显著。最后,提出了促淤网格防护下的最终促淤深度计算公式,为今后促淤网格的工程应用提供参考。How to reduce the scour pit depth is an important issue in bridge design and maintenance.To further explore the influence of the installation position of the lattice promoting sedimentation on the sedimentation and restoration effect of local scour pits around piles and piers,this paper investigates the change characteristics of sedimentation and restoration efficiency with the installation position and aperture size of the lattice promoting sedimentation by flume test.The results show that the sedimentation and restoration efficiency is less affected by the intensity of incoming flow and more affected by the relative installation position of the lattice.To improve the stability and sedimentation and restoration effect of the lattice promoting sedimentation,it is necessary to install the lattice promoting sedimentation as high as possible below the trough of the sand wave,so as to obtain the maximum sedimentation capacity and increase the sedimentation depth.The effect of the installation position of the lattice on the sedimentation and restoration effect of scour pits is significant with the decreasing aperture size of the lattice.Finally,this paper proposes a formula for calculating the final sedimentation depth under the protection of the lattice promoting sedimentation,which can provide a reference for the future engineering application of the lattice promoting sedimentation.

关 键 词：均匀流 桥墩冲刷 冲刷坑 促淤网格 安装位置 修复率 

分 类 号：U443.8[建筑科学—桥梁与隧道工程] TV147.5[交通运输工程—道路与铁道工程]