Encyclopedia of Engineering Geology

2018 Edition
| Editors: Peter T. Bobrowsky, Brian Marker

Cambering

  • Peter HobbsEmail author
  • A. J. Mark Barron
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-73568-9_40

Definition

Mass movement caused by gradual lowering and thinning of underlying strata, under gravitational forces, toward an adjacent valley or slope.

Cambering occurs where competent and permeable caprock overlies incompetent beds (e.g., clay, mudstone, siltstone, and sand). Following valley incision, the incompetent material is “extruded” from beneath the caprock initially as a result of stress relief and a reduction in shear strength due to pore pressure increases associated with thawing during periglaciation. The overlying competent beds develop a local dip, or “camber,” toward the valleys and, where relatively thin, sets of cross-slope subvertical parallel discontinuities may form, commonly developing into faults separating more steeply dipping blocks, referred to as “dip-and-fault” structure (Fig. 1) (Chandler et al. 1976; Hutchinson 1991). With time, this process breaks the caprock into discrete blocks “floating” in the medium of the underlying, weaker strata. Under lateral...
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References

  1. Barron AJM, Sheppard TH, Gallois RW, Hobbs PRN, Smith NJP (2010) Geology of the bath district. A brief explanation of the geological map sheet 265 bath. British Geological Survey, Nottingham. 35pGoogle Scholar
  2. Barron AJM, Uhlemann S, Pook GG, Oxby L (2016) Investigation of suspected gulls in the Jurassic limestone strata of the Cotswold Hills, Gloucestershire, England using electrical resistivity tomography. Geomorphology 268:1–13CrossRefGoogle Scholar
  3. Chandler RJ, Kellaway GA, Skempton AW, Wyatt RJ (1976) Valley slope sections in Jurassic strata near bath, somerset. Philos Trans R Soc Lond A283:527–556CrossRefGoogle Scholar
  4. Fookes PG, Lee EM, Griffiths JS (2007) Engineering geomorphology – theory & practice. Whittles Publishing, DunbeathGoogle Scholar
  5. Forster A, Hobbs PRN, Monkhouse RA, Wyatt RJ (1985) An environmental geology study of parts of West Wiltshire and South east Avon. British Geological Survey Internal Report, WN/85/25. Department of the EnvironmentGoogle Scholar
  6. Horswill P, Horton A (1976) Cambering and valley bulging in the Gwash valley at Empingham, Rutland. Philos Trans R Soc A 283:427–451CrossRefGoogle Scholar
  7. Hungr O (2014) The Varnes classification of landslide types, an update. Landslides 11(2):167–194CrossRefGoogle Scholar
  8. Hutchinson JN (1991) Periglacial slope processes. In: Forster A, Culshaw MG, Cripps JC, Little JA, Moon CF (eds) Quaternary engineering geology, Special publication, vol 7. Geological Society, London, pp 283–331Google Scholar
  9. Parks CD (1991) A review of the mechanisms of cambering and valley bulging. In: Forster A, Culshaw MG, Cripps JC, Little JA, Moon CF (eds) Quaternary engineering geology, Special publication, vol 7. Geological Society, London, pp 373–380Google Scholar
  10. Parry S, Baynes FJ, Culshaw MG, Eggers M, Keaton JF, Lentfer K, Novotny J, Paul D (2014) Engineering geological models: an introduction: IAEG commission 25. Bull Eng Geol Environ 73(3):689–706CrossRefGoogle Scholar
  11. Self CA, Farrant AR (2013) Gulls, gull-caves and cambering in the southern Cotswold Hills, England. In: Filippi M, Bosak P (eds) 16th international congress of speleology, vol 3. Czech Speleological Society, Brno, pp 132–136Google Scholar
  12. Vaughan PR (1976) The deformation of the Empingham Valley slope. Phil Trans R Soc A (Appendix) 283:452–462Google Scholar

Copyright information

© Crown Copyright 2018

Authors and Affiliations

  1. 1.British Geological SurveyNottinghamUK