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Mapping desiccation fissures using 3-D electrical resistivity tomography

Jones, Gareth and Zielinski, Marcin and Sentenac, Phillippe (2012) Mapping desiccation fissures using 3-D electrical resistivity tomography. Journal of Applied Geophysics, 84. pp. 39-51. ISSN 0926-9851

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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.

Item type: Article
ID code: 40512
Keywords: embankments, monitoring, detection, fissures, cracks, 3-D electrical resistivity tomography, mapping, desiccation fissures, Engineering (General). Civil engineering (General), Geophysics
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Law, Arts and Social Sciences > Geography and Sociology > Geography
Faculty of Engineering > Civil and Environmental Engineering
Depositing user: Pure Administrator
Date Deposited: 23 Jul 2012 10:46
Last modified: 15 Jan 2016 03:12

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