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Evaluation of the Risk of Marine Slope Instability: A Pseudo-3D Approach for Application to Large Areas

2001; Taylor & Francis; Volume: 19; Issue: 2 Linguagem: Inglês

10.1080/10641190152481403

1521-0618

Nabil Sultan, P. Cochonat, Jean‐François Bourillet, Florence Cayocca,

3D Modeling in Geospatial Applications

This paper presents a methodology developed to evaluate the instability of submarine slopes that extends over a large area.Special attention was paid to 1) the complex geometry (bathymetry) and the expanse of the slope, 2) the heterogeneity of the sediment and 3) the distribution of the pore pressure.The safety factor was considered as a spatially varying quantity.The General Formulation (GLE -Fredlund and Krahn 1977), which fully satisfies equilibrium conditions, was used for evaluating the stability of the marine slope.The submarine slope failure, which occurred on October 16th 1979 during the construction of new Nice airport, was studied in order to test the developed model.Geotechnical parameters were taken from experimental tests carried out by IFREMER on 19 cores extracted at different depths (from 27 m to 1300 m) (Cochonat et al. 1993 andMulder et al. 1994).Many scenarios were proposed in order to explain the cause of the Nice slope failure (Habib 1994).In this paper, two of those scenarios were tested.Simulation results are presented and discussed.