桩承台桥墩基础局部冲刷数值模拟研究  

Numerical Simulation Research on Local Scour against Abutment Foundation of Pile Cap

作　　者：闫杰超 徐华[2] Yan Jiechao;Xu Hua(China Power Construction Jiangsu Survey,Design and Research Institute Co.,Ltd.,Nanjing Jiangsu 211100,China;Nanjing Hydraulic Research Institute,Nanjing Jiangsu 210029,China)

机构地区：[1]中电建江苏勘测设计研究院有限公司,江苏南京211100 [2]南京水利科学研究院,江苏南京210029

出　　处：《港口航道与近海工程》2023年第6期1-6,19,共7页Port,Waterway and Offshore Engineering

基　　金：国家重点研发计划(2021YFB2600700);中国中铁股份有限公司科研项目(2019-重大-07);国家自然科学基金(51779149)。

摘　　要：为研究桩承台桥墩基础局部冲刷机理及其局部冲刷影响特性,本文采用CFD软件建立三维水沙动力模型研究了矩形与梯形承台桩承台桥墩基础在不同承台高程下的局部冲刷特性。同时,采用HEC-18公式对矩形承台桩承台桥墩基础局部冲刷深度进行计算。研究结果表明:不同承台高程下将影响桩承台桥墩基础最大局部冲刷深度,且不同承台形状对周边水流产生不同的影响,说明承台在桩承台桥墩基础局部冲刷中具有举足轻重的作用,而HEC-18公式计算结果同样说明随着承台高程向泥面靠近,承台部分对局部冲刷深度贡献增大,且梯形承台桩承台桥墩基础增加及影响更为显著。In order to study the mechanism and properties of local scour against the abutment of pile cap,CFD software is used to establish a 3D water-sand dynamic model for studying the properties of local scour against the abutment of rectangular and trapezoidal pile caps with different elevations.At the same time,Formula HEC-18 is used to calculate the depth of local scour against the abutment of rectangular pile cap.The results show that different elevations of pile cap will affect the maximum depth of local scour against the abutment of pile cap,and different shapes of pile cap will also influence local water flow,which indicates that pile cap plays a decisive role in local scour against the abutment foundation.The calculation results based on HEC-18 formula also show that the impact of pile cap on local scour depth increases when the pile cap elevation is closer to mud surface.In Addition,trapezoidal pile cap causes more significant influence on local scour depth.

关 键 词：边桩承台桥墩基础 局部冲刷 冲刷机理 数值模拟 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]