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<publisher>HAL CCSD</publisher>
<title lang=en>Formation of parallel joint sets and shear band/fracture networks in physical models</title>
<creator>Jorand, C</creator>
<creator>Chemenda, A.</creator>
<creator>Petit, Jean-Pierre</creator>
<contributor>Géoazur (GEOAZUR) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-00795555</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00795555</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00795555</source>
<source>Tectonophysics, Elsevier, 2012, 581, pp.84-92. 〈10.1016/j.tecto.2011.11.021〉</source>
<identifier>DOI : 10.1016/j.tecto.2011.11.021</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2011.11.021</relation>
<language>en</language>
<subject lang=en>Rock mechanics</subject>
<subject lang=en>Extension tests</subject>
<subject lang=en>Deformation bands</subject>
<subject lang=en>Dilation</subject>
<subject lang=en>Joints</subject>
<subject lang=en>Instability</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synthetic granular, cohesive, frictional and dilatant rock analogue material GRAM2. For the first time parallel sets of fractures that have all the characteristics of natural joints were reproduced in the laboratory. The fractures are regularly spaced, normal to σ3, and have plumose morphology very similar to that of natural joints. These fractures can form at tensile stress σ3 much smaller in magnitude than the tensile strength of material and even at slightly compressive σ3. When mean stress σ exceeds a certain value, the fractures become oblique to σ1 (the obliquity increases with σ), forming networks of conjugate shear bands/fractures. These results of plane-strain experiments are in good agreement with those of better controlled conventional axisymmetric tests on a similar material in Chemenda et al. (2011b) and are closer to real geological situations. Both types of experiments are complementary. Their results lead to the conclusion that at least certain categories of natural fractures (including joints, and conjugate shear fractures/bands) were initiated as deformation localization bands. The band orientation is defined by the constitutive properties/parameters (notably the dilatancy factor) that are sensitive to σ.</description>
<date>2012-12-18</date>
</dc>
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