Wave Barriers for Reduction of Train-Induced Vibrations in Soils |
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Authors: | H H Hung Y B Yang D W Chang |
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Affiliation: | 1Engineer, Structural Engineering Dept. I, China Engineering Consultants, Inc., 185, Hsin-Hai Rd., Section 2, Taipei, Taiwan 106, R.O.C. 2Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei, Taiwan 10617, R.O.C. 3Senior Vice President, China Engineering Consultants, Inc., 185 Hsin-Hai Rd. Section 2, Taipei, Taiwan 106, R.O.C.
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Abstract: | This paper is aimed at studying the effectiveness of different vibration countermeasures in isolating the ground vibrations induced by trains moving at sub- and supercritical speeds, with respect to the Rayleigh wave speed of the supporting soils. The vibration countermeasures considered herein include the installation of open trenches, in-filled trenches, and wave impeding blocks. The 2.5D finite/infinite element approach developed previously by the authors is employed in this study. This approach allows us to consider the load-moving effect of the train in the direction normal to the two-dimensional profile considered, and therefore to obtain three-dimensional results using only two-dimensional elements. The moving train is simulated as a sequence of moving wheel loads that may vibrate at some specific frequencies. The performance of the three types of wave barriers in isolating soil vibrations for trains moving at sub- and supercritical speeds with various excitation frequencies is evaluated with respect to some key parameters, along with suggestions made for enhancing the isolation efficiency. |
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Keywords: | Vibration Vibration control Railroad cars Isolation Barriers |
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