The paper presents a description of several uses of radiographs of soil samples that have been found valuable in a geological and geotechnical investigation of varved soil. The radiographs were taken while the soil was still in the sampling tubes, thus enabling examinations to be made of the samples before they were extruded.The uses to which the radiographs have been primarily made are to record in detail the soil stratigraphy, to make examinations of the soil structure and texture, and to help plan laboratory-test programs.Damage to 'undisturbed' samples, in the form of transverse cracks created during the sampling process, was detected by examination of the radiographs. Such features as these might not be detected in extruded samples because they are obscured by smeared soil on the surface of the sample and because cracks would tend to become closed during extrusion.A brief discussion is included of the requirements for making radiographs.
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Kenney et al. (1972) studied this question.