Dissolution features are common in the Chalk and may result in differential or collapse settlement of foundations if undetected. Dissolution pipes and cavities may be easily missed by conventional drilling methods. Probing and geophysical methods of investigation offer an attractive alternative due to their ability to cover large areas rapidly and thus minimize cost. The success of geophysical methods depends on many factors, principally the size of the feature in relation to the depth of burial and the cover material. This paper describes a study of dynamic probing and a number of geophysical methods used to locate dissolution features at two sites with contrasting ground conditions. The first site contained a bowl‐shaped doline over a clay‐filled dissolution pipe beneath a relatively thin soil cover. At the second site there was a thick, predominantly granular cover material that contained cavities which had migrated from dissolution pipes in the chalk below. Ground truth data from trenching was obtained to provide a basis for evaluating the investigation methods used. The ability of both dynamic probing and geophysical methods to locate and map dissolution features is discussed.
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.
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