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Título del libro: Rock Mechanics In Civil And Environmental Engineering - Proceedings Of The European Rock Mechanics Symposium, Eurock 2010
Título del capítulo: Rock fabric controls on the failure mode of strongly deformed gneisses

Autores UNAM:
ANTONIO POLA VILLASEÑOR;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Palabras clave:

Central Alps; Ductile deformations; High confining pressure; Indirect tension tests; Mechanical behaviour; Mesoscale; Micro-structural; Microscopic features; Rock fabrics; Rock sample; Shear failure; Shear zone; Triaxial compression; Unconfined compressive strength; X-ray computed tomography; Anisotropy; Crystallography; Deformation; Metamorphic rocks; Mineralogy; Minerals; Rock mechanics; Rocks; Tensile testing; Failure modes


Resumen:

The strength and deformability of anisotropic, folded metamorphic rocks strongly depend on rock mineralogy, texture and other microscopic features. Nevertheless, rock fabric controls on the failure mode of rocks which underwent severe ductile deformation are poorly understood and difficult to generalize.We studied the mechanical behaviour of gneiss samples of the Monte Canale unit (Central Alps, Italy). About 60 rock samples were tested under uniaxial and triaxial compression, and indirect tension tests. The samples revealed exceptionally low unconfined compressive strength (average 15MPa) andYoung's modulus (average<6GPa). Rock samples broke according to four failure modes, from shear failure along foliation to the development of centimetre-scale brittle shear zones, both at low and high confining pressure. X-ray Computed Tomography imaging and micro-structural analysis suggest that failure of strongly deformed metamorphic rocks is controlled by several anisotropies related to micro-fabric, not always readily detectable at meso-scale. © 2010 Taylor & Francis Group.


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