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Cone penetration testing to assess slope stability in the 1979 Nice landslide area (Ligurian Margin, SE France) 5
Steiner, Alois; Kopf, Achim J.; Henry, Pierre; Stegmann, Sylvia; Apprioual, Ronan; Pelleau, Pascal.
In the landslide-prone area near the Nice international airport, southeastern France, an interdisciplinary approach is applied to develop realistic lithological/geometrical profiles and geotechnical/strength sub-seafloor models. Such models are indispensable for slope stability assessments using limit equilibrium or finite element methods. Regression analyses, based on the undrained shear strength (su) of intact gassy sediments are used to generate a sub-seafloor strength model based on 37 short dynamic and eight long static piezocone penetration tests, and laboratory experiments on one Calypso piston and 10 gravity cores. Significant strength variations were detected when comparing measurements from the shelf and the shelf break, with a significant drop...
Tipo: Text Palavras-chave: Dynamic penetrometer; Sub-seafloor modeling; Weak zone; Free gas; Numerical slope stability.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38679/37172.pdf
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Le logmètre : un nouvel outil de saisie des descriptions de carottes 5
Savoye, Bruno; Floch, Gilbert; Kerbrat, Rene; Apprioual, Ronan.
Core description is used extensively by sedimentologists to yield critical information from sediments. It consists of a naturalistic description of the visual and textural characteristics of the sediment. It is generally a manual procedure. However, digital core descriptions are now required re manage data processing. Hand-written description can be keyed into a computer, but it is tedious and time consuming. Moreover, recording and typing errors can occur. A system is presented for digital description of sediment cores using a bar code principle. It can be used in the laboratory as well as on board vessels. It comprises a box inside which the half-core can be placed. A ruler and several sets of bar codes are printed on the inside box top. Bar codes are...
Tipo: Text Palavras-chave: Traitement informatique; Outil; Sédiment; Codes barres; Carotte; Software processing; Measuring board; Sediment; Bar codes; Core.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-838.pdf
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Lessons learned from the monitoring of turbidity currents and guidance for future platform designs 5
Clare, Michael; Lintern, D. Gwyn; Rosenberger, Kurt; Hughes Clarke, John E.; Paull, Charles; Gwiazda, Roberto; Cartigny, Matthieu J. B.; Talling, Peter J.; Perara, Daniel; Xu, Jingping; Parsons, Daniel; Silva Jacinto, Ricardo; Apprioual, Ronan.
Turbidity currents transport globally significant volumes of sediment and organic carbon into the deep-sea and pose a hazard to critical infrastructure. Despite advances in technology, their powerful nature often damages expensive instruments placed in their path. These challenges mean that turbidity currents have only been measured in a few locations worldwide, in relatively shallow water depths (,,2 km). Here, we share lessons from recent field deployments about how to design the platforms on which instruments are deployed. First, we show how monitoring platforms have been affected by turbidity currents including instability, displacement, tumbling and damage. Second, we relate these issues to specifics of the platform design, such as exposure of large...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00640/75200/75333.pdf
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