Size-Dependent Behaviour of Hard Rock Under Triaxial Loading
نویسندگان
چکیده
Abstract Understanding size effects is important to rigorously analyse the behaviour of rocks and rock masses at different scales for applications. A number empirical numerical studies have included on uniaxial compressive strength rocks, but only few focussed triaxial strength. In this study, several tests were conducted granite samples confinements (from 0.2 15 MPa) sizes 30 84 mm in diameter). The most relevant parameters recovered including peak residual strengths, orientation frictional response shear bands. Size observed be less dominant high confining pressures both strengths. resulting data analysed context size-dependent theories. For analyses, unified effect law (USEL) improved (IUSEL) used, which double trends, ascending descending behaviours observed. Size-dependent Hoek–Brown modified failure criteria based USEL IUSEL fit strengths exhibiting a good agreement between models laboratory data. brittle-ductile transition band under loading also analysed. clear brittle was particularly with large-diameters tested low confinements. Finally, regards behaviour, angle found affected by confinement sample size.
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ژورنال
عنوان ژورنال: Rock Mechanics and Rock Engineering
سال: 2023
ISSN: ['0723-2632', '1434-453X']
DOI: https://doi.org/10.1007/s00603-023-03367-3