基于有限元-无限元的沉管隧道三维动力响应分析

摘要

With the construction of a growing number of immersed tunnels and the frequent occurrence of global seismic activities,seismic performance of immersed tunnels and their joints has become a focus in the current re-search.Using the Zhoutouzui immersed tunnel in Guangzhou as an example,a 3D numerical model of the immersed tunnel-joint-soil is established by ABAQUS software using finite element/infinite element method.The dynamic re-sponse characteristics of different joints are studied by inputting the time history of El Centro ground motion at the model base.The calculation results show that the tunnel reaction is basically a symmetrical distribution,and the higher the joint connection stiffness the higher the internal force of the joints(axial force and bending moment).When an immersed tunnel is designed,the appropriate joint stiffness can be considered to control the internal force of the joint.%随着沉管隧道修建越来越多及近年来全球地震活动频发,沉管隧道及其接头在地震作用下的抗震性能成为目前研究的一大热点.文章立足于广州洲头咀沉管隧道工程的实际背景,基于ABAQUS软件有限元-无限元相结合的方法建立了沉管隧道-接头-场地土的三维实体模型,并通过在模型基底输入El Centro地震动时程,研究了不同接头连接刚度条件下沉管隧道不同接头处的动力响应特性.计算结果表明:隧道反应基本上呈对称分布,接头连接刚度越大,接头的内力(轴力、弯矩)也越大.在进行沉管隧道设计时,可以通过采用适当的接头刚度来控制接头的内力.