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The Influence of Initial Grain Shape and Pore Anisotropy on Strength Brittle Soils

Synopsis The correlation between soil structure as defined at the particulate level and strength and deformation properties as measured at a bulk level is examined. It is found that strength anisotropy arises chiefly from macropore anisotropy, and the deformation follows a preferred path of minimum energy demand provided by such pores. In finegrained material this path is often independent of grain shape, but where the initial anisotropy is so strong that the minimum energy criterion cannot be fulfilled, strength anisotropy is observed. The influence of total porosity on strength is great, and substantially independent of grain shape for specimens large in comparison to the grain size. On examine la correlation entre la structure des sols telle que definie au niveau particulaire, et les qualites de resistance et de deformation determinees a l'aide d'un echantillon de masse. On a trouve que la resistance anisotrope decoule principalement de l'anisotropie des macro-pores, et la deformation suit de preferenc...