Field measurement and vibration reduction evaluation of rubber floating slab track on metro lines
AbstractRubber floating slab track (RFST) is a vibration reduction track structure widely adopted in metro lines because the environmental vibration problems induced by urban rail transit are getting worse. Due to the complexity of rubber materials and the uncertainty of environmental factors, there may be some differences in the vibration reduction effects of RFST between its design and service phase. To monitor and evaluate realistic vibration reduction effects of RFST, field measurements are carried out on four typical cross sections in a tunnel of a metro line. Vertical accelerations of rail, track slab, and tunnel wall are collected
for straight-line (SL) and curved-line (CL) segments. The measurement data are analysed and compared between common track and RFST. Time-domain and frequency-domain analysis are carried out, and Z weighted vibration acceleration level on tunnel wall is calculated. The field measurement results show the vibration reduction effects of RFST are remarkable. It can hinder the transmission of vibration from the track to the tunnel. The results can provide a reference for the application of RFST in metro lines.
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