Study on vibration reduction slab track and adjacent transition section in high-speed railway tunnel
Qingyuan Xu1 , Xiaoping Chen2 , Bin Yan3 , Wei Guo4
1, 2, 3, 4School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China
Journal of Vibroengineering, Vol. 17, Issue 2, 2015, p. 905-916.
Received 11 August 2014; received in revised form 2 October 2014; accepted 10 October 2014; published 31 March 2015
The objective of this paper is to study the reasonable stiffness of rubber mat layer of vibration reduction slab track and configuration of rubber mat layer of transition section slab tack between vibration reduction section and normal section in high-speed tunnel. Based on achievements of the related studies, a high-speed train, slab track and tunnel finite element coupling dynamic model was established, and corresponding program was developed with MATLAB and verified by in situ measured data. The dynamic responses of slab track under moving high-speed train with different vibration reduction configurations and transition arrangements in Shiziyang tunnel of Guangzhou-Hong Kong high-speed railway line in China were analyzed. The study shows that: the rubber mat layer under the slab of slab track can greatly reduce the tunnel vibration, but the slab bending moment and the rail vertical displacement will increase, so the stiffness of rubber mat layer under the slab of slab track in tunnel of high-speed railway line should not be too low; the stiffness of rubber mat layer of slab track in tunnel of Guangzhou-Hong Kong line is controlled by the rail vertical displacement, and the stiffness value of 0.04 N/mm3 is reasonable; the vibration and dynamic stress of slab track can be improved greatly by setting transition section between vibration reduction slab track and ordinary slab track, and the design of transition section slab track in tunnel of Guangzhou-Hong Kong line is reasonable.
Keywords: high-speed railway, vibration reduction, coupling dynamic, tunnel, transition section, slab track.
The works described in this paper are supported by National Natural Science Foundation of China (No. 51178469), the National Science Joint High-speed Railway Foundation of China (No. U1334203) and China Postdoctoral Science Foundation (2014M552158), as well as the State Scholarship Fund of China Scholarship Council (No. 201208430112).
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