深水桥梁台阶式沉井基础局部冲刷特性研究  

Study on local scour characteristics of stepped open caisson of deep water foundations for bridge

作　　者：闻云呈[1] 王晓航[1] 夏云峰[1] 赵泽亚 成泽霖 WEN Yuncheng;WANG Xiaohang;XIA Yunfeng;ZHAO Zeya;CHENG Zelin(Nanjing Hydraulic Research Institute, Nanjing 210029, China;College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《海洋工程》2021年第2期62-69,共8页The Ocean Engineering

基　　金：国家重点研发计划项目(2018YFB16004);江苏水利科技项目(2020002,2020010)。

摘　　要：为探究台阶式沉井基础附近局部冲刷的影响,建立三维水动力数学模型,计算分析恒定流下台阶式沉井基础附近水动力特征。基于数值模拟结果设计了8个有效试验工况进行物理模型试验,分别探究了台阶式沉井平台宽度、埋置深度以及挡墙高度对局部冲刷特性的影响并进行讨论。试验结果表明台阶式沉井局部最大冲刷深度随平台截面宽度比增大逐步减小并趋于稳定。台阶式沉井局部最大冲刷深度随平台埋深比增大而逐步减小最终趋于稳定。台阶式沉井平台处设置较低挡墙对减小沉井周围局部冲刷最大深度有小幅的效果。To investigate the effect of local scour near the stepped open caisson,a 3D hydrodynamic numerical model has been established to simulate and analyze the hydrodynamic characteristics of stepped open caisson with flow.8 effective cases were carried out by physical experiment basing on the results of numerical simulation.The effects of the width,embedded depth and underwater retaining wall height of stepped open caisson platform on local scour were studied and discussed.The experiment results show that the maximum local scour depth of stepped caisson gradually decreases and tends to be stable with the increase of the ratio of platform section width.The maximum local scour depth of stepped caisson decreases gradually with the increase of platform buried depth ratio,and finally tends to be stable.Setting lower underwater retaining wall of stepped caisson has a small effect on reducing the maximum depth of local scour around open caisson.The results will also provide scientific support for the follow-up design of open caisson.

关 键 词：桥梁工程 台阶式沉井 局部冲刷形态 水槽试验 

分 类 号：TV148[水利工程—水力学及河流动力学]