Study on Seismic Response Characteristics of Immersed Tube Tunnels with Longitudinal Limit Device
（1. Transportation Project Management Center of Central District, Guangzhou, Guangzhou 510030; 2. Guangzhou University, Guang?zhou 510006; 3. Guangzhou General Municipal Engineering Design & Research Institute Co., Ltd., Guangzhou 510030)
Abstract：
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 reinforce? ment of key weak places.
WANG Mingjun1 LIANG Qizhi1 HUANG Yongbin2 LI Yadong2 YANG Chunshan3
.Study on Seismic Response Characteristics of Immersed Tube Tunnels with Longitudinal Limit Device[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(4): 106-115
2023, Vol. 60 