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Geological model for the Menai Strait tunnel

K. Sandford and G. Mason
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-047, 24 August 2020, https://doi.org/10.1144/qjegh2020-047
K. Sandford
1Mott MacDonald, 10 Temple Back, Bristol BS1 6FL, UK
Roles: [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
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  • For correspondence: kate.sandford@mottmac.com
G. Mason
2Mott MacDonald, Endeavour House, Pynes Hill, Exeter EX2 5WH, UK
Roles: [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
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Abstract

A 400 kV electricity transmission line is required to cross the Menai Strait to connect the proposed Wylfa Newydd nuclear power station on Ynys Mon (also known as Anglesey) with the mainland. Through an initial feasibility study, the preferred Menai Strait crossing option has been shown to require the construction of a tunnel. This region has a complex geological history, where the oldest strata, consisting of schist and tuff deposits, are interpreted as Precambrian. There are also Carboniferous bedrocks of interbedded limestones, mudstones and sandstones, and Ordovician siltstones and quartzite sandstones. The superficial deposits and landforms are understood to be almost entirely the signature of the last Devensian glaciation, except for occasional deposits and landforms resulting from fluctuations in sea-level. A 3D geological model has been created using published geological records and project-specific surveys, including field surveys, rock exposure mapping, ground investigations and geophysical surveys. This allows the visualization of the anticipated geology of the area, the identification of geological hazards and efficient design and planning for construction.

Thematic collection: This article is part of the Ground models in engineering geology and hydrogeology collection available at: https://www.lyellcollection.org/cc/Ground-models-in-engineering-geology-and-hydrogeology

Supplementary material: An overview video is available at https://doi.org/10.6084/m9.figshare.c.5045048

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Quarterly Journal of Engineering Geology and Hydrogeology: 54 (2)
Quarterly Journal of Engineering Geology and Hydrogeology
Volume 54, Issue 2
May 2021
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Geological model for the Menai Strait tunnel

K. Sandford and G. Mason
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-047, 24 August 2020, https://doi.org/10.1144/qjegh2020-047
K. Sandford
1Mott MacDonald, 10 Temple Back, Bristol BS1 6FL, UK
Roles: [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: kate.sandford@mottmac.com
G. Mason
2Mott MacDonald, Endeavour House, Pynes Hill, Exeter EX2 5WH, UK
Roles: [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Geological model for the Menai Strait tunnel

K. Sandford and G. Mason
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-047, 24 August 2020, https://doi.org/10.1144/qjegh2020-047
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