
São tratados neste artigo aspectos relativos a resistência ao cisalhamento de maciços de solos saprolíticos, propondo-se uma metodologia de estudo para os mesmos semelhante a utilizada em maciços rochosos. Nestes a influencia das descontinuidades na resistência ao cisalhamento tem sido bastante estudada, enquanto nos maciços de solos saprolíticos esta influência devido as estruturas planares reliquiares ainda é pouco conhecida. São apresentados resultados de ensaios triaxiais realizados de forma pioneira, com solos saprolíticos de migmatito, da forma como se tem estudado com rochas, mas com base em tensões efectivas. Alem disto são apresentadas as bases te6ricas do problema e o conceito de um coeficiente de anisotropia.
This paper approaches aspects regarding the shear strength of saprolitic soil masses. It proposes a methodology of study of such masses similar to the one used in rock masses, on which the influence of the discontinuities in the shear strength have extensively been studied, while as regards saprolitic soil masses, this influence due to relict planar structures is still poorly known. It further presents results of triaxial tests carried out for the first time with migmatite saprolitic soils, according to the same form used for the study of rocks, however based upon effective stresses. Besides this, theories related to the problem and definition of an anisotropy coefficient are also presented.
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