EPS Geofoam as a Wave Barrier for Attenuating High-Speed Train-Induced Ground Vibrations: A Single-Wheel Analysis
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(2020) 6:43
ORIGINAL PAPER
EPS Geofoam as a Wave Barrier for Attenuating High‑Speed Train‑Induced Ground Vibrations: A Single‑Wheel Analysis M. Roshan Khan1 · Satyanarayana Murty Dasaka1 Received: 24 January 2020 / Accepted: 27 September 2020 © Springer Nature Switzerland AG 2020
Abstract Vibrations induced by high-speed trains in the ground are a common cause of concern in the urban railway lines due to construction of buildings and inhabitation of residents close to railway lines. The present study aims to evaluate the potential use of geofoam as an in-fill material for passive trenches to reduce the vibrations generated by railways. Considering the higher frequencies of railway vibrations in comparison with earthquake excitations, characterization of vibration attenuation efficiencies of geofoam in-filled trenches is done in the scale of peak particle velocities (PPV). A comprehensive study is conducted on the effects of buffer stiffness, geofoam density, and dimensions and location of the in-filled trench away from the railway track. Results indicate that having low buffer stiffness for the geofoam in-filled trenches are efficient in reduction of railway-induced ground vibrations. Grades of geofoam with smaller densities are observed to have better vibration attenuation characteristics as well. It is also characterized that the location of the trench close to the railway embankment results in an overall reduction in the vibration levels in the ground. A higher depth of in-filled trench is requisite, if the trench is located at higher distance from the track. It is ascertained that geofoam in-filled trenches are highly suitable for attenuating the train-induced vibrations in the native sub-soil. Keywords Ground vibrations · High-speed railways · Peak particle velocity · Vibration mitigation · Geofoam wave barrier
Introduction Urban railway networks have recently seen a rapid growth in the passenger traffic and freight transport, for their reliability, convenience and cost-effectiveness. Increase in the train speeds and axle loads has indirectly led to augmented levels of vibrations in railway tracks, which subsequently propagate away onto the surrounding buildings, causing damages to the structures and disturbance to its residents. Attenuation of train-induced vibrations, therefore, becomes necessary, especially in the areas proximate to railway tracks with structures sensitive to vibrations. Extensive research has been carried out on isolation of ground vibrations with in-filled/open trenches. These trenches act as a discontinuity in the pathway of vibration * Satyanarayana Murty Dasaka [email protected] M. Roshan Khan [email protected] 1
Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, India
waves, causing reflection, refraction, damping (in-filled trench) and transmission of the propagating wave. Woods [1] performed experimental studies on the vibration isolation efficiencies of open trenches. Considering a screening efficiency of 75%, it wa
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