Seismic Response Analysis Of Shear Joints Of Pipe Joints In Immersed Tunnels

In recent years,the submarine tunnel has gradually become the main mode of transportation connecting the straits,bays and islands.At the same time,the earthquake disasters in all parts of China still cause huge losses to the people's economy and spirit.As the main mode of transportation in the new era,it is bound to be necessary.Pay attention to the hazards that may be caused by earthquake disasters,and prevent them from happening.At present,there are many researches on submarine immersed tunnels.There are various large,medium and small scale physical experiments,as well as various numerical simulation analysis of the immersed tube model.However,the previous analysis mainly focused on the impermeability of the immersed pipe section itself.The mechanical properties and the docking problems of the pipe joints during the construction process are less studied in the operation process of the pipe joints.Therefore,this paper is of great significance for the force analysis of the pipe joint joints under the action of earthquakes.In this paper,the Hong Kong-Zhuhai-Macao immersed tunnel is used as a model to analyze the stress characteristics of the jointed shear bond under different working conditions and the response characteristics under seismic fluctuation using finite element numerical simulation.The details are as follows:(1)A brief introduction to finite element theory and related theories about seismic waves.(2)Based on the constitutive relationship,the numerical simulation of the submarine immersed pipe model of Hong Kong-Zhuhai-Macao is carried out,and the characteristics and laws of the immersed pipe model under the conditions of upper bending,lower bending and torsion are analyzed respectively,and the observation and analysis are emphasized.The local force of the vertical shear key.(3)According to the characteristics of seismic waves,the model is subjected to seismic fluctuations,and the response of the model under seismic fluctuations is analyzed.At the same time,the stress of each surface of the shear bond is analyzed.(4)According to the force characteristics of the immersed tube model,the simulation of two different schemes is carried out,and the influence of the shear key and the shear key force on the shear bond force are studied respectively,and then the earthquake is carried out.Fluctuation response analysis.(5)The characteristics of the force characteristics of the model under different working conditions are summarized with the change of the size of the differential settlement.At the same time,the specific suggestions for optimizing the shearing force are given for the previous analysis.