交通荷载下软土复合地基海底沉管隧道动力响应特性分析  

Analysis on dynamic response characteristics of submarine immersed tube tunnels on soft soil composite foundation under traffic load

作　　者：王祥秋[1] 冯天俊 刘旭光 WANG Xiang-qiu;FENG Tian-jun;LIU Xu-guang(School of Civil Engineering and Transportation,Foshan University,Foshan,Guangdong 528225,China)

机构地区：[1]佛山大学土木与交通学院,广东佛山528225

出　　处：《中国港湾建设》2024年第11期7-12,共6页China Harbour Engineering

基　　金：国家自然科学基金项目(51278121);广东省基础与应用基础研究基金项目(2023A1515012085)。

摘　　要：以港珠澳大桥沉管隧道管节为研究对象,利用MIDAS GTS NX软件建立三维动力有限元模型,采用界面单元模拟管节接头,通过施加重载车辆模拟振动荷载,对沉管隧道管节以及高压旋喷桩软土复合地基的动力响应特性进行分析。研究结果表明:车辆振动荷载可诱发海底沉管隧道管节及其复合地基产生明显的环境振动效应。当120级挂车以80 km/h的运行速度通过海底沉管隧道时,在沉管隧道管节接头处产生的最大竖向位移量达3.21 mm,最大加速度峰值达17.77 mm/s^(2);高压旋喷桩复合地基顶面最大位移达1.98 mm,加速度峰值达2.38 mm/s^(2)。沉管隧道管节接头处加速度振动级达81.9 d B,重载车辆运行对软土复合地基海底沉管隧道动力稳定性的影响不可忽视。Taking the pipe segments of the Hongkong-Zhuhai-Macao Bridge immersed tube tunnel were regarded as the research object,a three-dimensional dynamic finite element model was established using MIDAS GTS NX software.Interface elements were used to simulate the joint of the pipe segments,and the dynamic response characteristics of the immersed pipe segments and high-pressure rotary jet grouting pile soft soil composite foundation were analyzed by applying heavy-duty vehicle simulation vibration loads.The research results indicate that vehicle vibration loads can induce significant environmental vibration effects on the pipe segments and composite foundations of underwater immersed tube tunnels.When a trailer of 120 level passes through an underwater immersed tube tunnel at a speed of 80 km/h,the maximum vertical displacement generated at the joint of the immersed pipe segments can reach 3.21 mm,and the maximum peak acceleration can reach 17.77 mm/s^(2);The maximum displacement of the top surface of the high-pressure rotary jet pile composite foundation can reach 1.98 mm,and the peak acceleration can reach 2.38 mm/s^(2).The acceleration vibration level at the joint of the immersed pipe segments can reach 81.9 dB.The influence of heavy-duty vehicle operation on the dynamic stability of submarine immersed tube tunnels on soft soil composite foundation cannot be ignored.

关 键 词：沉管隧道 软土复合地基 交通荷载 动力响应特性 有限元模拟 

分 类 号：U652.7[交通运输工程—港口、海岸及近海工程] TU470[交通运输工程—船舶与海洋工程]