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Chapter 7 Engineering investigation and assessment

M. H. de Freitas, J. S. Griffiths, N. Press, J. Russell, A. A. Parkes, I. G. Stimpson, D. R. Norbury, C. Coleman, J. Black, G. Towler and K. Thatcher
Geological Society, London, Engineering Geology Special Publications, 28, 741-830, 2 November 2017, https://doi.org/10.1144/EGSP28.7
M. H. de Freitas
1Imperial College London and First Steps Ltd, Unit 17, Hurlingham Studios, Ranelagh Gardens, London SW6 3PA, UK
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  • For correspondence: m.defreitas@imperial.ac.uk
J. S. Griffiths
2School of Geography, Earth & Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK
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N. Press
3CGG-NPA Satellite Mapping, Crockham Park, Edenbridge, Kent TN8 6SR, UK
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J. Russell
4Wessex Archaeology, Portway House, Old Sarum Park, Salisbury, Wiltshire SP4 6EB, UK
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A. A. Parkes
5Office for Nuclear Regulation, Redgrave Court, Merton Road, Bootle, Merseyside L20 7HS, UK
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I. G. Stimpson
6School of Geography, Geology and the Environment, William Smith Building, Keele University, Staffordshire ST5 5BG, UK
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D. R. Norbury
7David Norbury Limited, Littlefield Gate, Upper Basildon, Reading RG8 8JG, UK
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C. Coleman
8Fugro GeoServices Ltd, Fugro House, Hithercroft Road, Wallingford OX10 9RB, Oxfordshire, UK
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J. Black
9In Site Hydro Ltd, 24 Ludgate Drive, East Bridgford, Nottingham NG13 8NW, UK
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G. Towler
10Quintessa Limited, 633/635 Birchwood Boulevard, Birchwood, Warrington WA3 7QU, UK
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K. Thatcher
10Quintessa Limited, 633/635 Birchwood Boulevard, Birchwood, Warrington WA3 7QU, UK
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Abstract

Ground affected by periglacial and glacial processes can be among the most variable formed by nature. Previous chapters have graphically illustrated this variability and explained the topographic and sedimentary associations to be expected within former and present-day cold regions. This chapter shows how that background is needed to design and execute an investigation for predicting either the ground response to engineering change or the volumes of material the ground contains. Such an investigation of the ground is also needed to explain its current and former state of stability on slopes and its natural groundwater flow.

The starting point of any such investigation is a conceptual model of the ground which subsequent investigation tests and refines; investigations conducted without such a model can easily become sterile and expensive exercises in collecting data. Such a model starts with knowledge of landscape, cold climate processes and their products, initially refined with the aid of a desk study. This then develops with each phase of the investigation, starting with what is known via desk studies, and progressing through what can be readily seen by walkover surveys and shallow investigations, including surface geophysics and remote sensing, all leading towards a model that can be tested directly by various intrusive investigations. Techniques appropriate for such investigations, including sampling, in glaciated and frost-disturbed ground both onshore and offshore are reviewed.

Great care must be taken with the description of coarse materials, glaciotectonic structures and the materials within them; a unique feature of this chapter is the correlation it presents between the engineering descriptions of glacial sediments, as used in ground engineering, and the descriptions used by glacial sedimentologists for the same materials. Water levels are also obtained during these investigations, and in these types of ground they are often misinterpreted by applying thinking more appropriate to aquifer hydrogeology. A surprising feature of glaciated ground is its low permeability overall, and the correct interpretation of heads measured in such environments is often that for aquitards rather than aquifers.

The initial conceptual model starts with little more than an idea and a broad outline, and evolves as the investigation progresses. It should continue to evolve throughout construction as more and more of the ground is exposed and its behaviour is better known; in this way, the ground model can be thought of as a living document, especially appropriate in such variable ground. The chapter concludes with a review of how this information can be brought together as three-dimensional models that effectively communicate the knowns and unknowns of a volume of ground and their associated risks, in both deterministic and probabilistic ways.

  • © 2017 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Engineering Geology Special Publications: 28 (1)
Geological Society, London, Engineering Geology Special Publications
Volume 28
2017
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Chapter 7 Engineering investigation and assessment

M. H. de Freitas, J. S. Griffiths, N. Press, J. Russell, A. A. Parkes, I. G. Stimpson, D. R. Norbury, C. Coleman, J. Black, G. Towler and K. Thatcher
Geological Society, London, Engineering Geology Special Publications, 28, 741-830, 2 November 2017, https://doi.org/10.1144/EGSP28.7
M. H. de Freitas
1Imperial College London and First Steps Ltd, Unit 17, Hurlingham Studios, Ranelagh Gardens, London SW6 3PA, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: m.defreitas@imperial.ac.uk
J. S. Griffiths
2School of Geography, Earth & Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
N. Press
3CGG-NPA Satellite Mapping, Crockham Park, Edenbridge, Kent TN8 6SR, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. Russell
4Wessex Archaeology, Portway House, Old Sarum Park, Salisbury, Wiltshire SP4 6EB, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
A. A. Parkes
5Office for Nuclear Regulation, Redgrave Court, Merton Road, Bootle, Merseyside L20 7HS, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
I. G. Stimpson
6School of Geography, Geology and the Environment, William Smith Building, Keele University, Staffordshire ST5 5BG, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
D. R. Norbury
7David Norbury Limited, Littlefield Gate, Upper Basildon, Reading RG8 8JG, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
C. Coleman
8Fugro GeoServices Ltd, Fugro House, Hithercroft Road, Wallingford OX10 9RB, Oxfordshire, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. Black
9In Site Hydro Ltd, 24 Ludgate Drive, East Bridgford, Nottingham NG13 8NW, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
G. Towler
10Quintessa Limited, 633/635 Birchwood Boulevard, Birchwood, Warrington WA3 7QU, UK
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  • Search for this author on this site
K. Thatcher
10Quintessa Limited, 633/635 Birchwood Boulevard, Birchwood, Warrington WA3 7QU, UK
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Chapter 7 Engineering investigation and assessment

M. H. de Freitas, J. S. Griffiths, N. Press, J. Russell, A. A. Parkes, I. G. Stimpson, D. R. Norbury, C. Coleman, J. Black, G. Towler and K. Thatcher
Geological Society, London, Engineering Geology Special Publications, 28, 741-830, 2 November 2017, https://doi.org/10.1144/EGSP28.7
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  • Article
    • Abstract
    • 7.1 Introduction
    • 7.2 Preliminaries
    • 7.3 Near-surface geophysics
    • 7.4 Soil and rock descriptions
    • 7.5 Ground investigation
    • 7.6 Hydrogeological investigation
    • 7.7 Engineering ground model
    • 7.8 Conclusion
    • Acknowledgments
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