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3-D slope stability analysis: A probability approach applied to the nice slope (SE France) 5
Leynaud, Didier; Sultan, Nabil.
Recent geophysical and geotechnical data acquired on the Nice shelf to the east of the 1979 landslide source area, Suggest slow deformations processes which could lead to future catastrophic slope failure. According to these preliminary interpretations, it is of major interest to perform a slope stability evaluation to define the hazard and quantify the danger related to a probable instability on this slope. A probabilistic approach is proposed here using a modified version of the SAMU_3D model, a 3-D slope stability software recently developed by Sultan and others to account for complex geometry. The 3-D analysis is based on the upper bound theorem of plasticity developed by Chen and others. One of the main features of the original model is to allow...
Tipo: Text Palavras-chave: Probabilistic analysis; Slope stability; Monte Carlo simulation; Shear zone.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11290/7828.pdf
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Investigation of a possible submarine landslide at the Var delta front (Nice continental slope, southeast France) 5
Sultan, Nabil; Savoye, Bruno; Jouet, Gwenael; Leynaud, Didier; Cochonat, Pierre; Henry, P.; Stegmann, Sylvia; Kopf, Achim.
The Var prodelta progrades across a straight, narrow shelf (less than 2 km wide) with a very steep continental slope reaching locally more than 30 degrees. Historically, the Var delta front is sadly famous for the 1979 catastrophic submarine landslide that resulted in several casualties and infrastructural damage. Geotechnical and geophysical investigations carried out in late 2007 to the east of the 1979 landslide scar provide evidence for the possible occurrence of a new important sedimentary collapse and submarine landslide. Geophysical data acquired in the area show the presence of several seafloor morphological steps rooted to shallow subsurface seismic reflections. Moreover, in situ piezocone measurements demonstrate the presence of several shear...
Tipo: Text Palavras-chave: CPTu; Gassy soil; Piezocone; Shear zone; Submarine landslides.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00004/11481/8096.pdf
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The role of sedimentation rate and permeability in the slope stability of the formerly glaciated Norwegian continental margin: the Storegga slide model 5
Leynaud, Didier; Sultan, Nabil; Mienert, Jurgen.
Despite the gently dipping slopes (ca 1 degrees), large-scale submarine slope failures have occurred on the mid-Norwegian continental margin (Storegga, Sklinnadjupet, Traenadjupet), suggesting the presence of special conditions predisposing to failure in this formerly glaciated margin. With a volume estimated between 2,400 and 3,200 km(3) and an affected area of approximately 95,000 km(2), the Storegga slide represents one of the largest and best-studied submarine slides of Holocene age known worldwide. Finite element modeling of slope failure indicates that a large (6.5 < Ms < 7.0) seismic triggering mechanism would not be sufficient to cause failure at more than 110 m below the seabed as observed for the slip planes at Storegga (northern sidewall)....
Tipo: Text Palavras-chave: Submarine slide; Slope stability; Sediment overpressure; Rapid sedimentation.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3521.pdf
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