Accurate identification of soil dynamic parameters is crucial for improving the precision of micro-vibration simulation for large scientific facilities. Parameters such as soil layer thickness and shear wave velocity provided in geological survey reports have wide value ranges, and relevant data are even harder to obtain after foundation treatment. In addition, soil damping ratio is generally not included in conventional geological surveys, making it difficult for existing models to achieve accurate full-band fitting of vibration responses.This paper adopts a stepwise inversion method based on ambient vibration for model calibration. The shear wave velocity and stratum thickness of each soil layer are inverted from field measured data, and the soil damping ratio is calibrated using site vibration responses induced by traffic excitation. Other parameters are determined according to geological survey data. The proposed method is verified on a practical large scientific facility via nine in-situ monitoring points. The calibrated model shows good agreement between simulated and measured results within the target frequency band, with an average relative error of only 3.92%. Without the requirement for large excitation equipment, this method greatly enhances calibration efficiency and resolves the mismatch between simulation and measurement. It can provide a reference for refined micro-vibration modeling of sites for large scientific facilities.

Li Wei, 32, holds a Master’s degree in Civil Engineering from a Project 211 university. She works at the Vibration Technology Research Center of China Electronics Engineering Design Institute Co., Ltd., focusing on site soil dynamics for high-precision large scientific facilities.

Her research interests cover in-situ inversion of soil dynamic properties, calibration of site finite element simulation models, and micro-vibration calculation for electronic factories. She has long been responsible for site vibration investigation, numerical modeling and dynamic parameter calibration of domestic large scientific facilities such as synchrotron radiation light sources, and devotes herself to the simulation analysis of soil-structure coupled vibration.

She has participated in a number of national research projects, published several academic papers and obtained a number of authorized invention patents. Her research achievements have been presented at multiple domestic academic conferences on vibration and acoustics. She is greatly honored to be invited as an invited speaker at this conference, and looks forward to in-depth academic exchanges with scholars worldwide on site vibration and noise control.