Experimental and numerical evaluation of the effectiveness of a stiff wave barrier in the soil |
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| Institution: | 1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium;2. CEDEX, Laboratoria de Geotecnia, Alfonso XII 3, 28014 Madrid, Spain;1. School? of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Civil, Structural, and Environmental Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA;1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;2. University of Cambridge, Department of Engineering, Trumpington Street, Cambridge CB2 1PZ, United Kingdom;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. School of Civil Engineering, Central South University, Changsha 410083, China;3. Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, VIC 3122, Australia;4. Key Laboratory of Advanced Technology for Vehicle Body Design & Manufacture, Hunan University, Changsha 410082, China;1. School of Civil Engineering, Central South University, Changsha, Hunan, China;2. School of Architecture, Changsha University of Science & Technology, Changsha, Hunan, China |
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| Abstract: | This paper discusses the design, the installation, and the experimental and numerical evaluation of the effectiveness of a stiff wave barrier in the soil as a mitigation measure for railway induced vibrations. A full scale in situ experiment has been conducted at a site in El Realengo (Spain), where a barrier consisting of overlapping jet grout columns has been installed along a railway track. This barrier is stiff compared to the soil and has a depth of 7.5 m, a width of 1 m, and a length of 55 m. Geophysical tests have been performed prior to the installation of the barrier for the determination of the dynamic soil characteristics. Extensive measurements have been carried out before and after installation of the barrier, including free field vibrations during train passages, transfer functions between the track and the free field, and the track receptance. Measurements have also been performed at a reference section adjacent to the test section in order to verify the effect of changing train, track, and soil conditions over time. The in situ measurements show that the barrier is very effective: during train passages, a reduction of vibration levels by 5 dB is already obtained from 8 Hz upwards, while a peak reduction of about 12 dB is observed near 30 Hz immediately behind the barrier. The performance decreases further away from the jet grouting wall, but remains significant. The experimental results are also compared to numerical simulations based on a coupled finite element–boundary element methodology. A reasonable agreement between experiments and predictions is found, largely confirming the initially predicted reduction. This in situ test hence serves as a ‘proof of concept?, demonstrating that stiff wave barriers are capable of significantly reducing vibration levels, provided that they are properly designed. |
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| Keywords: | Railway induced vibrations Stiff wave barrier In situ experiment Vibration mitigation |
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