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Surpressions de fluide et stabilité des prismes d'accrétion : théorie et validation numérique et expérimentale

Abstract : This study is focused on the effect of fluid over-pressures on the global stability of accretionary prisms and also on the localization of the deformation. To achieve this aim, both a methodology using limit analysis including the effect of fluid pressure and an experimental approach using compressed air as pore fluid were developed. First, the new protocol set up during the experimental work allowed a validation of the classic critical taper theory. The theory developed was apply to different examples. It has been showed that a simple heterogeneity in the décollement properties of a triangular wedge could have complex impact on the stability conditions and on the failure mechanisms. Moreover, studying real accretionary prism (Barbados and Nankai), fluid pressure field leading to the activation of the observed structure have been determined and scenarios explaining the de-activation of the Nankai splay fault have been be proposed.
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Submitted on : Monday, October 22, 2012 - 10:04:07 AM
Last modification on : Thursday, March 17, 2022 - 10:08:25 AM
Long-term archiving on: : Wednesday, January 23, 2013 - 3:36:03 AM

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  • HAL Id : tel-00743957, version 1

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Adeline Pons. Surpressions de fluide et stabilité des prismes d'accrétion : théorie et validation numérique et expérimentale. Géophysique [physics.geo-ph]. Université Paris-Diderot - Paris VII, 2012. Français. ⟨tel-00743957⟩

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