Abstract
The presence of small scale discontinuities (fissures) in London clay influences its geotechnical characteristics. Fissures are also found in many other deposits in southern England. The fissures are responsible for the so-called sample-size effect when the behaviour of London clay is investigated in the laboratory. The author concludes that although discontinuities have a marked influence on the peak strength of London clay, the analytical and experimental evidence presented seems to suggest that their effect on the initial portion of the stress-strain curve is reduced provided they are (and remain) closed. In view of the other difficulties in determining the in situ deformation characteristics of stiff-fissured clays, the author suggests that the influence of discontinuities could be considered to be of secondary importance. (TRRL)
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