Analysis of whole process of structural vibration induced by underground high-speed train and performance of vibration isolation support

Vibration caused by operation of underground high-speed train propagates through surrounding stratum to lead to the secondary vibration of nearby underground structures and adjacent buildings on the ground, and affect surrounding environment and service performance of buildings. Here, taking a certain commercial complex building as the background, combining with relevant parameters and onsite measured data, a 3-D finite element dynamic analysis model for the "tunnel-soil-baseplate-superstructure" system was established to calculate structural vibration response during operation of underground high-speed train. Combining with the vibration control standard, the vibration reduction and isolation effect of the vertical vibration isolation support was studied. The results showed that the vibration of the commercial complex building near the tunnel exceeds the limit without taking vibration reduction and isolation measures; setting vertical vibration isolation support can effectively suppress vibration responses of the building structure, vertical vibration isolation support with different parameters can reduce the average vibration level of the building floorplate by about 4.2-7.6 dB; comprehensively considering the vibration reduction and isolation effect and the vertical deformation of the support, the recommended value of damping ratio for the vibration isolation support is 0.01 and the support vertical stiffness is taken as 130 kN/mm; finally, the design method for parameters of vertical vibration isolation support is deduced to provide a necessary guidance for subsequent engineering applications. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.