The Seismic Response Analysis Of Submarine Immersed Tunnel

With the rapid development of China's economy,modern traffic construction has also been developed vigorously,especially in some coastal cities.More and more cross-sea bridge projects,undersea tunnel projects have been built or are in the process of construction.For submarine tunnel engineering,due to the particularity of its environment,it is necessary to evaluate its seismic performance by analyzing its seismic response.At present,most of the seismic response analysis methods of submarine immersed tunnel are using uniform excitation to incident seismic waves horizontally or vertically.In order to study the non consistent dynamic response of submarine immersed tunnel under oblique incidence of seismic waves,the following work is done in this paper.(1)The present situation of several famous submarine tunnel projects and the development of submarine tunnels in the world is introduced,and the main research results of the seismic response of the submarine immersed tube tunnel are combed.The seismic response characteristics of submarine tunnel are summarized.(2)The seismic response analysis method of submarine tunnel and underground structure engineering is systematically summarized,and the advantages and disadvantages of various theoretical analysis methods are compared and analyzed.The basic theory and realization method of the constitutive model of soil,fluid solid coupling,viscoelastic artificial boundary and seismic wave transformation into equivalent load in dynamic finite element analysis are introduced.(3)Taking the Dalian Bay submarine Tunnel project as the research background,on the basis of collecting the relevant tunnel data,the whole analysis model of the sea soil tunnel is established by the three-dimensional dynamic finite element method.The dynamic response law of displacement,acceleration and principal stress of the submarine tunnel is analyzed when the seismic wave is incident at different angles.(4)The overall analysis model of the submarine tunnel under the conditions of different seismic waves and different peak acceleration seismic waves are established respectively,and the calculation results of the displacement,acceleration and the main stress of the immersed tunnel under different conditions are compared.The influence factors of the dynamic response of the immersed tube tunnel under the oblique incidence of seismic waves are analyzed,and the dynamic response law of the immersed tube tunnel under the oblique incidence of seismic waves is obtained.