A multi-hazard risk model with cascading failure pathways for the Dawlish (UK) railway using historical and contemporary data

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Abstract

The failure of the vital economic railway link between London and the southwest of the United Kingdom in the 2014 storm chain incurred up to £1.2bn of economic losses. This incident highlighted the urgent need to understand the cascading nature of multi hazards involved in storm damage. This study focuses on the Dawlish railway where a seawall breach caused two months of railway closure in 2014. We used historical and contemporary data of severe weather damage and used failure analysis to develop a multi-hazard risk model for the railway. Twenty-nine damage events caused significant line closure in the period 1846–2014. For each event, hazards were identified, the sequence of failures were deconstructed, and a flowchart for each event was formulated showing the interrelationship of multiple hazards and their potential to cascade. The most frequent damage mechanisms were identified: (I) landslide, (II) direct ballast washout, and (III) masonry damage. We developed a risk model for the railway which has five layers in the top-down order of: (a) root cause (storm); (b) force generation (debris impact, wave impact, overtopping, excess pore pressure, wind impacts); (c) common cause failure (slope instability, rail flooding, coping and parapet damage, foundation failure and masonry damage); (d) cascading failure (landslide, ballast washout, upper masonry seawall failure, loss of infill material), and (e) network failure forcing service suspension. We identified five separate failure pathways and damage mechanisms by analysing these 29 major events.

Original languageEnglish
Article number102082
JournalInternational Journal of Disaster Risk Reduction
Volume56
Early online date29 Jan 2021
DOIs
Publication statusPublished - 1 Apr 2021

Bibliographical note

Funding Information:
Funding: This project was funded by the UK Engineering and Physical Sciences Research Council (EPSRC) through a PhD scholarship to Keith Adams. We are grateful to Brunel University London (BUL) for administering this scholarship. We thank Dr. David Dawson (University of Leeds, UK) for sharing his research records and Mr Paul Szadorski (BUL, UK) and Mrs Teresa Wynn-Clarke (Dawlish, UK) for assisting us during the field surveys. KA acknowledges numerous library staff including BUL special collections, the British Library, the National Archives at Kew, Dawlish museum and the library of the UK Institution of Civil Engineers for their support in locating historical documents. We thank the valued and extensive input from our anonymous reviewers through the editing process.

Publisher Copyright:
© 2021 The Author(s)

Keywords

  • Cascading failure pathway
  • Damage mechanism
  • Dawlish railway
  • Multi-hazard
  • Storm surge
  • Structural vulnerability

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Safety Research
  • Geology

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