Research On Dynamic Experimental Characteristics Of New-designed Seismic Response Model Box

With the development of society and economy,the quantity rapid growth of the construction of the tunnel,because our country is located in the Pacific seismic belt and Eurasian seismic belt,the earthquake frequency is high,therefore,the aseismic design of the tunnel is becoming more and more attention.Because tunnel structure more buried in geotechnical engineering,so,in the process of experiment,not only need to simulate the structure itself,at the same time should also be simulated surrounding strata,therefore,will need to be on the vibration table to establish model experiment box to have the effect of transfer seismic wave to structures.For a long time,domestic and foreign scholars have done a lot of research on the model experiment box,however,it is difficult for the existing model boxes to fully simulate the situation of soil in earthquake.Therefore,it is urgent to optimize the design of the model experiment box,so as to make the seismic study of the tunnel more realistic.In this paper,based on the high-speed rail joint fund key projects of the highspeed railway tunnel service behavior and security risk control research "(U1434206),through the investigation and study and the method of model experiment,the earthquake response of the tunnel are summarized,introduced a new type of dynamic and static coupling model experiment box design principle and design scheme,and compared with the traditional rigid model experiment box contrast experiment,through the experimental results of processing analysis,think that new type of dynamic and static coupling model experiment box in the dynamic response characteristics of experiment and stability than traditional rigid box has obvious advantages,can be more realistic simulation of underground structure in earthquake response.The basic conclusions are as follows:(1)the change of acceleration of soil in the new box is consistent with the real situation,which can effectively and effectively reflect the acceleration response characteristics of the strata in the earthquake.(2)the redesign of the sidewall structure of the new box has effectively improved the existing boundary effect problem of the existing model box,showing a prominent advantage in the control experiment.In the loading of seismic wave,the acceleration and amplification coefficient of the new box is much higher than that of the rigid box.(3)The new box can effectively improve the defect of the rigid box,and can better simulate the difference of the amplification effect of the seismic wave propagation in the vertical direction through the joint of the side wall,the setting of the spring and the use of the material with large rigidity.