Z. Cabarkapa, Geotechnical Consulting Group, London The authors have used work published by Leps (1970), where the peak angle of shearing resistance is approximately a linear function of normal stress on a semi-log plot over a wide stress range. They have tried to extend that relation to very low stress and performed in situ direct shear box tests. It is the discusser's opinion that the description of an important soil property such as the shear strength should be applicable to the complete stress range from zero to elevated pressures. In order to demonstrate that this is possible, the discusser has processed the data on shearing strength for all materials shown in Figs 7 and 8 using the general expression proposed by Maksimovic (1988, 1989a, 1989b, 1993, 1996).
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