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• W830321688 abstract "The paper presents an experimental study on the residual shear strength of different clayey soils at varying total suctions. In a first part of the paper some insight into the behaviour of residual shear strength of a filled rock discontinuity is presented to bring into light the sensitivity to hydraulic states of a clayey gouge material subjected to shearing along large displacements. An adapted Bromhead ring shear apparatus, in which the sample is enclosed in a controlled relative humidity chamber, has been used to control total suction during shearing. Afterwards, results on different types of clayey materials are presented to discuss the importance of the plasticity of the clay on the residual friction angle changes. These changes show an important increase in the residual friction angle with imposed total suction that may reach 15° for medium plastic clay and without cohesion component. The reasons for this increase have been explained by the more granular character of the dry clay as a result of aggregate densification and desaturation during strong drying. The changes have been interpreted using a simple model inspired in both macroscopic and microstructural observations, which is based on the stiffness of the soil (or aggregates) and depends on the product of the total suction applied and the degree of saturation. A microstructural model, already developed to take into account microstructural aspects on water retention and following an equivalent behavioural response to the macroscopic shrinkage curve, has been used to estimate the degree of saturation at the microstructural level (inside aggregates). To highlight its applicability in geotechnical practice, the different parameters used in the water retention and residual shear strength models have been shown to depend on the plasticity index of the different clayey soils studied." @default.
• W830321688 created "2016-06-24" @default.
• W830321688 creator A5006172810 @default.
• W830321688 creator A5026861815 @default.
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• W830321688 date "2014-01-01" @default.
• W830321688 modified "2023-10-15" @default.
• W830321688 title "Suction effects on the residual shear strength of clays" @default.
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• W830321688 doi "https://doi.org/10.3233/jgs-141320" @default.
• W830321688 hasPublicationYear "2014" @default.
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