Study On Seismic Dynamic Response Of Up And Down Adjacent Underground Structures

With the development of Urban Rail Transit,The development of underground space is becoming more and more mature,the combination of structure is more complex,and the problem of approaching is becoming more and more acute.Under the action of earthquake,the seismic dynamic response of the structure with the combination of up and down close connection is more complex than that of the Conventional underground structure.Therefore,under the action of earthquake,the seismic dynamic response law of the near and near underground structures can enhance our understanding of the stability and safety of underground structures with complex combinations and has very important significance.In this paper,the seismic dynamic response of the subway tunnel and the underground transfer station is studied.Study on the effects of different seismic wave excitation direction,two different vertical structures,two spacing structure reinforcement soil sandwich degree on the two structure of the internal force and displacement of the peak peak,in order to provide a reference for similar projects.The results show that:(1)The direction of excitation of different seismic waves has a significant influence on the structure of the project,and the dynamic response of the structure is positively related to the intensity of the corresponding wave input direction.(2)The key parts of the structure:Structural bifurcation of municipal tunnel;Transfer station’s Structural inflection point,Shield section and standard section’s Handover site,Transfer station structure area not overlapped with municipal tunnel.(3)According to 0 degrees,45 degrees,90 degrees,a total of 3 kinds of fluctuations in the direction of input combined with 2 m,4 m,6 m,8 m,10 m of the 5 different vertical distances are Crossed combination into 15 conditions for calculation.The peak value of displacement and internal force can be obtained that with the decrease of the vertical distance between the upper and lower two structures,the dynamic response is smaller.When the vertical distance is greater than 8 m,the interaction between the two structures is small;the dynamic response of the two structures is similar to that of the structure exist separately.(4)According to 0 degrees,45 degrees,90 degrees,a total of 3 kinds of fluctuations in the direction of input combined with 0E,0.2E,0.4E,0.6E,0.8E,1.0E of the 6 kinds of reinforcement are Crossed combination into 18 conditions for calculation.The peak value of displacement and internal force can be obtained that two structure of the middle soil layer to a certain degree of reinforcement treatment,The dynamic response of the two structures is obviously weakened And the reinforcement effect is better when 0.4E-0.8E is in the range of reinforcement(E is the measured modulus of elasticity of the soil interlayer after the maximum grouting amount).