Risk Assessment and Early-Warning System for High-Speed Railway during the Construction and Operation of Underpass Bridges
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 1
Abstract
Potential risk assessment and early-warning system are essentially important to ensure the safety of high-speed railway (HSR) bridges. This paper presents an in-depth methodology of this risk assessment and early warning. Firstly, the risk sources, occurrence probabilities, and hazard consequences were investigated by consulting specialists. For kernel-risk sources, such as excavation and dewater activities, finite-element models were established to evaluate the deformation of foundations and approach embankments in various conditions. Then, with combined quantitative and qualitative analysis, the as low as reasonably possible (ALARP) criterion was utilized to obtain the results of risk assessment. On the early-warning system, autoregressive integrated moving average (ARIMA) method was used to predict the continuous deformation and to analyze the kernel indices that may affect the railway operations. At last, the forewarning interval of each index that can be used in the construction monitoring was suggested. The proposed methods of risk assessment, settlement prediction, construction monitoring, and early-warning system have been successfully applied to the Cuiheng Road Underpass of the Beijing-Tianjin Intercity Railway and may be used in future similar projects. Practices have shown that these methods can effectively reduce risks, ensure structural safety, and maintain sustainable development.
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Acknowledgments
Authors of this paper thank the staff of the Third Railway Survey and Design Institute Group Corporation of China for their assistance in the monitoring works. The contributions by Professor Mao Jianqiang from the Department of Geotechnical Engineering, Southwest Jiaotong University, are also greatly acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 1 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 23, 2013
Accepted: Mar 19, 2015
Published online: Jun 23, 2015
Discussion open until: Nov 23, 2015
Published in print: Feb 1, 2016
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