Influence of major inherited faults zones on gravitational slope deformation: A two-dimensional physical modelling of the La Clapière area (Southern French Alps)

Autor: Thomas Bois, S. Bouissou, Yves Guglielmi
Přispěvatelé: Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2008
Předmět:
Zdroj: Earth and Planetary Science Letters
Earth and Planetary Science Letters, 2008, 272 (3-4), pp.709-719. ⟨10.1016/j.epsl.2008.06.006⟩
Earth and Planetary Science Letters, Elsevier, 2008, 272 (3-4), pp.709-719. ⟨10.1016/j.epsl.2008.06.006⟩
ISSN: 0012-821X
DOI: 10.1016/j.epsl.2008.06.006
Popis: Inherited faults are known to influence rock slope stability and gravitational deformation. In spite of that, in many studies few faults are identified in field and properly used in models of gravitational slope deformation. The aim of this work is to study the influence of inherited faults zone density and geometry on gravitational failure processes at the massif scale using a physical modelling technique which satisfies the similarity criteria. Models are scaled to the well-documented natural example of La Clapiere in the Southern French Alps. Experiments were conducted using mechanically homogeneous material with variable fault geometry. In each of tested configurations, the mobilized volume was almost the same. Results confirmed the hypothesis that the La Clapiere landslide is a shallow section of a deep-seated gravitational slope deformation. Furthermore, among the various configurations tested, only one is enable to reproduce the observed superficial deformation on the La Clapiere hillside. This result demonstrated that the geometry of the faults at depth plays a major role on the style of gravitational deformation patterns. Regarding the particular case of La Clapiere, our results give new insights on the shape of the faults affecting the massif at depth. In particular, normal listric faults seem to have shallow inflexions compared to a deep-seated thrust fault that was either gravitationally formed or pre-existing but inactive (i.e. sealed) before slope destabilization and then gravitationally reactivated.
Databáze: OpenAIRE
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