Failure Characteristics of Joint Bolts in Shield Tunnels Subjected to Impact Loads from a Derailed TrainReport as inadecuate




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Shock and Vibration - Volume 2017 2017, Article ID 2829783, 17 pages - https:-doi.org-10.1155-2017-2829783

Research ArticleKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan, China

Correspondence should be addressed to Yanyang Zhang

Received 28 October 2016; Revised 5 January 2017; Accepted 10 January 2017; Published 13 February 2017

Academic Editor: Tony Murmu

Copyright © 2017 Qixiang Yan et al. 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.

Abstract

Impact loads generated by derailed trains can be extremely high, especially in the case of heavy trains running at high speeds, which usually cause significant safety issues to the rail infrastructures. In shield tunnels, such impact loads may not only cause the damage and deformation of concrete segments, but also lead to the failure of segmental joint bolts. This paper presents a numerical study on the failure behavior of segmental joint bolts in the shield tunnel under impact loading resulting from train derailments. A three-dimensional 3D numerical model of a shield tunnel based on the finite element FE modelling strategy was established, in which the structural behavior of the segmental joint surfaces and the mechanical behavior of the segmental joint bolts were determined. The numerical results show that the occurrence of bolt failure starts at the joints near the impacted segment and develops along the travel direction of train. An extensive parametric study was subsequently performed and the influences of the bolt failure on the dynamic response of the segment were investigated. In particular, the proposed FE model and the analytical results will be used for optimizing the design method of the shield tunnel in preventing the failure of the joint bolts due to the impact load from a derailed HST.





Author: Qixiang Yan, Zhixin Deng, Yanyang Zhang, and Wenbo Yang

Source: https://www.hindawi.com/



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