| Popis: |
The areas susceptible to submarine mass movement occurrence on the continental slope and Sao Paulo Plateau were evaluated. In this evaluation, we used a spatial analysis tool, available in the Geographic Information System (GIS), together with the application of a mathematical model developed to predict areas susceptible to slides, based on a formulation of physical laws. The analysis of slope stability was carried out under undrained conditions, in terms of total stress, considering a normally-consolidated clay soil, and was based on the deterministic method for safety factor calculation through the limit equilibrium approach – one-dimensional infinite slope formulation in submerged condition. In this manner, it was possible to take into consideration the data on seafloor geometry (slope gradient) and the seafloor mechanical properties (undrained shear strength and submerged unit weight) in the safety factor calculation. As a result, we obtained regional maps of static safety factors for the evaluation of the susceptibility for submarine shallow translational slides on the slope and Sao Paulo Plateau of Campos Basin, considering two profiles of undrained shear strength of the soil: one corresponding to a lower strength limit, and the other one to an intermediary strength value. |
