Mapping desiccation fissures using 3-D electrical resistivity tomography

Gareth Jones, Marcin Zielinski, Phillippe Sentenac

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Discontinuities which may form in a soil mass due to desiccation have been shown to be a source of engineering concern in situations where low permeability barriers are required. Current methods for assessing the condition of such geo-barriers, are mainly based on visual inspections, which are inadequate when the soil surface is obscured by vegetation. Electrical Resistivity Tomography (ERT) has been shown to be sensitive to the presence of fissures in 2-D with inversion models mapping the fissure's positions and enabling their growth to be monitored. This paper presents a method for mapping fissured networks in 3-D using miniature arrays under laboratory conditions. The results of two experiments using compacted clay from two separate embankments show a good comparison between the visible surface fissures and the surface model obtained from a 3-D inversion, as well as showing good agreement between the vertical sections of the model and the exposed model interior following dissection. Additionally the results confirm that the 3-D method is suitable for monitoring the onset of fissuring. A comparison of Schlumberger, Dipole–Dipole and combined arrays for visualising the fissures is also presented, indicating that the combined method produces the most accurate image of the subsurface, while the Schlumberger array provides a greater resolution than the Dipole–Dipole array, alongside the added benefit of shorter survey times.
LanguageEnglish
Pages39-51
Number of pages13
JournalJournal of Applied Geophysics
Volume84
Early online date13 Jun 2012
DOIs
Publication statusPublished - Sep 2012

Fingerprint

desiccation
fissure
drying
tomography
electrical resistivity
dipoles
soils
inversions
dissection
vegetation
embankment
clays
inspection
discontinuity
permeability
soil surface
engineering
clay
method
monitoring

Keywords

  • embankments
  • monitoring
  • detection
  • fissures
  • cracks
  • 3-D electrical resistivity tomography
  • mapping
  • desiccation fissures

Cite this

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abstract = "Discontinuities which may form in a soil mass due to desiccation have been shown to be a source of engineering concern in situations where low permeability barriers are required. Current methods for assessing the condition of such geo-barriers, are mainly based on visual inspections, which are inadequate when the soil surface is obscured by vegetation. Electrical Resistivity Tomography (ERT) has been shown to be sensitive to the presence of fissures in 2-D with inversion models mapping the fissure's positions and enabling their growth to be monitored. This paper presents a method for mapping fissured networks in 3-D using miniature arrays under laboratory conditions. The results of two experiments using compacted clay from two separate embankments show a good comparison between the visible surface fissures and the surface model obtained from a 3-D inversion, as well as showing good agreement between the vertical sections of the model and the exposed model interior following dissection. Additionally the results confirm that the 3-D method is suitable for monitoring the onset of fissuring. A comparison of Schlumberger, Dipole–Dipole and combined arrays for visualising the fissures is also presented, indicating that the combined method produces the most accurate image of the subsurface, while the Schlumberger array provides a greater resolution than the Dipole–Dipole array, alongside the added benefit of shorter survey times.",
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Mapping desiccation fissures using 3-D electrical resistivity tomography. / Jones, Gareth; Zielinski, Marcin; Sentenac, Phillippe.

In: Journal of Applied Geophysics, Vol. 84, 09.2012, p. 39-51.

Research output: Contribution to journalArticle

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