摘要
以广州市如意坊沉管隧道工程为研究背景,利用ABAQUS有限元软件,基于改进后的反应位移法,建立考虑纵向限位装置的柔性接头整体多质点-梁-弹簧模型,分析地震作用下沉管隧道整体与关键截面的三维地震动力响应,并研究隧道最危险截面处的动力响应特性及损伤分布情况,探讨沉管隧道关键横截面的稳定性。结果表明:在地震作用下不均匀土层将引起隧道内力增大,对隧道结构造成一定的损伤;损伤主要分布在侧墙与底板的交界处,顶、底板的中部,此处裂缝由外向内发展,行车道孔洞中部内侧裂缝由内向外发育;隧道最危险截面的损伤状况反映出隧道仍具有较大的安全储备,但关键薄弱处的加固仍需重点关注。
Based on the Ruyifang Immersed Tube Tunnel Project in Guangzhou,the finite element software ABAQUS and the improved response displacement method are used to establish an integrated multiple mass-beamspring model of immersed tube tunnel with flexible joints by considering longitudinal limit devices.The model is used to analyze the 3D seismic dynamic response of the immersed tube tunnel as a whole and key sections under seismic action,study the dynamic response characteristics and damage distribution at the maximum stress section of the tunnel,and explore the stability of key cross-sections of the immersed tube tunnel.The results indicate that under seismic action,uneven soil layers will increase internal forces of the tunnel and cause certain damage to the tunnel structure;the damage is mainly distributed at the junction of the side wall and the bottom plate,as well as in the middle of top and bottom plates.The cracks here develop from outside to inside,while the inner side cracks in the middle of the traffic tube develop from inside to outside;The damage condition of the maximum stress section of the tunnel reflects that the tunnel still has a large safety margin,but close attention should still be paid to the reinforcement of key weak places.
作者
王明俊
梁启智
黄永彬
李亚东
杨春山
WANG Mingjun;LIANG Qizhi;HUANG Yongbin;LI Yadong;YANG Chunshan(Transportation Project Management Center of Central District,Guangzhou,Guangzhou 510030;Guangzhou University,Guangzhou 510006;Guangzhou General Municipal Engineering Design&Research Institute Co.,Ltd.,Guangzhou 510030)
出处
《现代隧道技术》
CSCD
北大核心
2023年第4期106-115,共10页
Modern Tunnelling Technology
基金
国家自然科学基金项目(51878192).
关键词
沉管隧道
地震动力响应
反应位移法
柔性接头
Immersed tube tunnel
Seismic dynamic response
Response displacement method
Flexible joint
