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3D Large-scale Seismic Response Analysis of Bored Section of an Immersed Tunnel Project
(1 Department of Geotechnical Engineering College of Civil Engineering, Tongji University, Shanghai 200092; 2 Key Laboratory of Geotechnical and Subsurface Engineering of the Ministry of Education, Tongji University, Shanghai 200092; 3 Dalian Bay Undersea Tunnel Co., Ltd., Dalian 116024; 4 Dalian Municipal Design & Research Institute Co., Ltd., Dalian 116021; 5 Shanghai Construction No.1 (Group) Co., Ltd., Shanghai 200120)
Abstract For an immersed tunnel project, the bored section is one of the important components, but there have not been studies on its seismic response. This paper establishes a 3D refined finite element dynamic analysis model for the bored section of an actual immersed tunnel project, in which the dynamic non-linear characteristics of soils are considered by using the equivalent linearization method, and the shear deformation of the ground is described by using remote lateral displacement boundaries as the lateral boundary conditions of the model. On this basis, a large-scale 3D response analysis of the bored section of the immersed tunnel is conducted under static and dynamic working conditions respectively to study the internal force and deformation response characteristics of each key section at the tunnel′s stiffness variation section under static and seismic effects. The results show that the seismic action has cer? tain level of influence on the internal force distribution of the structure; abrupt change would occur in the internal forces of the structure at the significant stiffness variation section; and abrupt changes in stiffness can cause a significant increase in the inter-story drifts of the structure.
Abstract：
For an immersed tunnel project, the bored section is one of the important components, but there have not been studies on its seismic response. This paper establishes a 3D refined finite element dynamic analysis model for the bored section of an actual immersed tunnel project, in which the dynamic non-linear characteristics of soils are considered by using the equivalent linearization method, and the shear deformation of the ground is described by using remote lateral displacement boundaries as the lateral boundary conditions of the model. On this basis, a large-scale 3D response analysis of the bored section of the immersed tunnel is conducted under static and dynamic working conditions respectively to study the internal force and deformation response characteristics of each key section at the tunnel′s stiffness variation section under static and seismic effects. The results show that the seismic action has cer? tain level of influence on the internal force distribution of the structure; abrupt change would occur in the internal forces of the structure at the significant stiffness variation section; and abrupt changes in stiffness can cause a significant increase in the inter-story drifts of the structure.
LI Xinxi1 YU Haitao2 LI Chunyuan3 YU Xiaodong4 XU Lei5
.3D Large-scale Seismic Response Analysis of Bored Section of an Immersed Tunnel Project[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(4): 104-108
2021, Vol. 58 