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Shock and Vibration Volume 2019 ,2019-07-08
Investigation of Concrete Base-Roadbed Surface Contact Variation-Induced Vibration Characteristics of Vehicle-Slab Track-Subgrade System considering Fluid-Solid Interaction
Research Article
Kai-Wen Liu 1 , 2 , 3 Fei Yue 1 Qian Su 1 , 2 Bao Liu 4 Pengfei Zhou 5
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DOI:10.1155/2019/1570736
Received 2019-01-19, accepted for publication 2019-04-14, Published 2019-04-14
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摘要

The excessive pumping of fines in saturated roadbed surface layer, which is induced by the fluid-solid interaction under dynamic loads from high-speed train, is a special form of high-speed railway subgrade defect reported recently. This can deteriorate the interface between nonballasted track structure bottom layer and roadbed surface layer and therefore lead to associated contact variation with the moving of trains. According to the dynamic Biot’s equations known as u-p formulation and the vehicle-track coupling dynamics theory, a vertical vehicle-slab track-subgrade coupling vibration model is developed to investigate the aforementioned contact variation-induced dynamic behavior of the whole system considering the fluid-solid interaction. Dynamic measurements from a field case study are adopted to verify the computation model proposed. Based on the numerical model validated, the effects of three contact variation statuses (continuous contact, vibrating contact, and contact loss) on dynamic responses of track subsystem and subgrade subsystem, such as dynamic pore-water pressure, vertical accelerations, and dynamic displacements both in time and frequency domains, are investigated. Also, a sensitivity analysis involving rail speeds and lengths of contact loss zone is performed, and the critical length of contact loss zone is suggested.

授权许可

Copyright © 2019 Kai-Wen Liu et al. 2019
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

通讯作者

Kai-Wen Liu.School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China, swjtu.edu.cn;Key Laboratory of High-Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China, moe.edu.cn;State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China, cumtb.edu.cn.kaiwenliu@swjtu.edu.cn

推荐引用方式

Kai-Wen Liu,Fei Yue,Qian Su,Bao Liu,Pengfei Zhou. Investigation of Concrete Base-Roadbed Surface Contact Variation-Induced Vibration Characteristics of Vehicle-Slab Track-Subgrade System considering Fluid-Solid Interaction. Shock and Vibration ,Vol.2019(2019)

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