By Félix Darve, Ioannis Vardoulakis
This publication offers the main recents advancements within the modelling of degradations (of thermo-chemo-mechanical beginning) and of bifurcations and instabilities (leading to localized or diffuse failure modes) happening in geomaterials (soils, rocks, concrete). purposes (landslides, rockfalls, particles flows, concrete and rock growing older, etc.) are mentioned in detail.
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Additional info for Degradations and Instabilities in Geomaterials
K- v -A. 17) The yield locus is no longer associated with a definite specific volume and within it, it is now possible to have recoverable change in volume. Nevertheless, any yield locus is still associated with a definite plastic volumetric strain. A better interpretation of test data is obtained and , in particular, in an undrained test, yielding is possible before the critical state line is attained. Figure 8 shows calculated results for a resedimented clay in drained and undrained triaxial tests.
It is also interesting to notice that the total length of the rectilinear proportional path and the decomposed paths (even for 'small' lengths of 'steps') are completely different (the ratio of both the lengths is equal to v'2). The same conclusions can be make by analyzing the results depicted in Figure 8 in the case of the loose Hostun sand. The same method is also considered in order to investigate the behaviour under an 'undrained' loading path (in fact isochoric loading) performed on loose Hostun sand.
0... e. twice the strains Eij , whilst r ij are the cor- responding shear stresses. 6 admits a unique solution. The state of stress and strain and the corresponding displacements could be then determined in each point of the soil for given loading or imposed displacements. In some simple cases, it was possible to found the solution even in closed form. Kelvin (1855), Boussinesq (1885) and Cerruti (1882) solved the three fundamental problems, that are, respectively: point load within an infinite mass, point vertical load on a semi-infinite mass, point horizontal load on a semi-infinite mass.
Degradations and Instabilities in Geomaterials by Félix Darve, Ioannis Vardoulakis
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