CHEN Wen-hua, ZHANG Qian. Space vibration of subsoil during metro train arriving at or leaving station[J]. 2019, 40(9): 3656-3661.
DOI:
CHEN Wen-hua, ZHANG Qian. Space vibration of subsoil during metro train arriving at or leaving station[J]. 2019, 40(9): 3656-3661.DOI: 10.16285/j.rsm.2018.1049.
Space vibration of subsoil during metro train arriving at or leaving station
Subsoil vibration induced by metro train arriving at or leaving station is a special vibration with vast vibration sources. In this study
the train vibration source is simplified to the cylindrical vibration source to study vibration characteristics and different vibrations caused by metro train arriving at and leaving station. On the basis of wave theory
the wave field expression in soil space is obtained by wave function expansion method. Secondly
the reflection law is used to deduce the propagation direction of different types of reflection waves. Thirdly
according to Graf addition formula and the Bessel function transformation
the wave field expression is converted into a uniform coordinate system
and undetermined coefficients are solved by boundary conditions of large circular arc surface. Finally
according to vibration superposition in frequency domain
the wave field expression of the moving vibration source is established during the whole train arriving at or leaving the station. The validity of cylindrical vibration source calculation method is verified by comparing the theoretical calculation results of ground vibration frequency spectrum with its actual monitoring results. In addition
low-frequency vibration characteristics are more obvious when the train arriving at or leaving station. Parameteric analysis shows that both the maximum starting acceleration and initial braking speed increase with increasing the vertical vibration response.