Full-scale model testing on a ballastless high-speed railway under simulated train moving loads |
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| Institution: | 1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, MOE, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;2. Institute of Hydraulic Structure and Water Environment, Zhejiang University, Hangzhou 310058, China;1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;2. MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China;3. China Railway Eryuan Engineering Group Co. Ltd., Chengdu 610031, China;4. School of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, China;5. Chengdu Vocational & Technical College of Industry, Chengdu 610213, China;1. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;2. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;3. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;4. Geoharbour Australia Pty Ltd, Melbourne, VIC 3000, Australia;1. Dept. of Civil Engineering, Instituto Superior Técnico (IST), Universidade de Lisboa, Lisbon, Portugal;2. Technical University of Catalonia (UPC), Barcelona, Spain |
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| Abstract: | Model testing in laboratory, as an effective alternative to field measurement, provides valuable data to understand railway׳s dynamic behaviors under train moving loads. This paper presents comprehensive experimental results on track vibration and soil response of a ballastless high-speed railway from a full-scale model testing with simulated train moving loads at various speeds. A portion of a realistic ballastless railway comprising slab track, roadbed, subgrade, and subsoil was constructed in a larger steel box. A computer-controlled sequential loading system was developed to generate equivalent vertical loadings at the track structure for simulating the dynamic excitations due to train׳s movements. Comparisons with the field measurements show that the proposed model testing can accurately reproduce dynamic behaviors of the track structure and underlying soils under train moving loads. The attenuation characteristics of dynamic soil stresses in a ballastless slab track is found to have distinct differences from that in a ballasted track. The model testing results provide better understanding of the influence of dynamic soil–structure interaction and train speed on the response of track structure and soils. |
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| Keywords: | High-speed railway Model testing Sequential loading system Track vibration Dynamic soil stress Dynamic soil–structure interaction (DSSI) |
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