Vibration characterization of fully-closed high speed railway subgrade through frequency: Sweeping test |
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| Institution: | 1. School of Mechanics and Civil Engineering, China University of Mining and Technology (CUMT), Xuzhou 221116, China;2. State Key Laboratory for Geomechanics & Deep Underground Engineering, CUMT, Xuzhou 221116, China;1. University of Technology Sydney, Tech Lab, Botany, NSW 2019, Australia;2. School of Civil and Environmental Engineering and Director, Transport Research Centre (TRC), University of Technology Sydney, NSW 2007, Australia;3. Transport Research Centre (TRC), University of Technology Sydney, NSW 2007, Australia;1. Department of Civil Engineering, Key Laboratory of Soft Soils and Geoenvironmental Engineering, MOE, Zhejiang University, Hangzhou, 310058, China;2. Institute of Sound and Vibration Research, University of Southampton, University Road, Highfield, Southampton, SO17 1BJ, United Kingdom;3. Engineering and Physical Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom;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 Environmental Engineering, Technical University of Crete, Greece;2. School of Rural and Surveying Engineering, National Technical University of Athens, Greece;1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China;2. National Engineering Research Center of High-speed Railway Construction Technology, Central South University, Changsha 410075, China;3. China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430074, China |
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| Abstract: | This paper presents the vibration characteristics of a new type fully-closed railway subgrade (FCRS) through field frequency – sweeping test. The FCRS, which uses semi-grid modified cement-based compound material as waterproof layer, is designed to solve serious subgrade damage problems induced by expansive soil. Dynamic stress sensors and accelerometers were installed at various locations in FCRS to monitor dynamic response. The results show that the attenuation regularities of dynamic stress and acceleration along subgrade depth were significantly affected by excitation frequency and semi-grid waterproof layer. The pronounced frequency of FCRS investigated in this paper was gently influenced by its layer system, and gradually changed from 20 Hz to 22 Hz as depth increased. |
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| Keywords: | Sugrade Field test Dynamic stress Expansive soil High speed railway |
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