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Geological Society, London, Engineering Geology Special Publications; 1997; v. 12; p. 235-245;
DOI: 10.1144/GSL.ENG.1997.012.01.21
© 1997 Geological Society of London

Section 3: Site Investigation

Electrical resistivity imaging systems for ground investigations, with particular reference to dissolution features in Chalk areas

J. Rigby-Jones1, M. C. Matthews1 & P. W. McDowell2

1 Department of Civil Engineering, University of Surrey, Guildford, Surrey, GU2 5XH, UK
2 Department of Geology, University of Portsmouth, Burnaby Road, Portsmouth, Hampshire, UK

The collection of high-quality resistivity data using conventional systems is time-consuming, particularly where large areas are to be surveyed at small electrode spacings. With the advent of modern computer controlled resistivity meters, used in conjunction with multicore takeout cables and switched electrode arrays, two-dimensional resistivity imaging systems have been developed. These systems lend themselves to the search for small-scale, near-surface, anomalies due to their improved accuracy and resolution over more conventional equipment and their ability to produce true resistivity modelled images. Near surface dissolution features in the Chalk can produce variations in ground resistivity and this paper discusses the field trials of two resistivity imaging systems at the known locations of such features. The results are compared to those obtained using conventional resistivity equipment and related to ground truth data obtained by drilling.