The analysis of the seismic behaviour of submarine slopes is of great interest in the geotechnical analyses devoted to the evaluation of the post-seismic serviceability conditions of seaport areas. In fact, the occurrence of earthquake-induced instabilities of these peculiar geotechnical systems is documented in many recent post-earthquake damage reports. The area in which the Messina port is located is characterized by a high seismic hazard and by the presence of saturated soil deposits which mainly consist of sandy and siltysand soils characterized by reduced values of the relative density. Accordingly, the main seismic hazards of the Messina harbor are related to local the seismic amplification of ground motion, the possible occurrence of dynamic liquefaction and the seismic instabilities of the submarine slopes. All these topics are of paramount importance in order to ensure the post-seismic serviceability conditions of the port area and of the port facilities and also in the perspective of reutilization of the port area. The Geotechnical Section of the Messina University has been recently charged of the evaluation of the seismic stability condition of the port area. In this vein the paper describes the analyses carried out with a numerical model developed to examine the seismic stability conditions of the submarine slopes which mainly consist of liquefiable granular materials. Slope stability conditions are evaluated taking into account the inertial effect and the possibly occurring excess pore water pressures. Displacement analysis is performed using an extension of Newmark’s sliding block model for rotational failure mechanisms taking into account the reduction of slope critical acceleration due to changes in soil shear strength. A parametric analysis has been performed in order to point out those parameters which mostly affect seismic slope response and some useful stability charts are provided.
Submarine slopes of the Messina seaport area: a model for the evaluation of the post-seismic serviceability conditions
Biondi G.;Cascone E;Di Filippo G.
2018-01-01
Abstract
The analysis of the seismic behaviour of submarine slopes is of great interest in the geotechnical analyses devoted to the evaluation of the post-seismic serviceability conditions of seaport areas. In fact, the occurrence of earthquake-induced instabilities of these peculiar geotechnical systems is documented in many recent post-earthquake damage reports. The area in which the Messina port is located is characterized by a high seismic hazard and by the presence of saturated soil deposits which mainly consist of sandy and siltysand soils characterized by reduced values of the relative density. Accordingly, the main seismic hazards of the Messina harbor are related to local the seismic amplification of ground motion, the possible occurrence of dynamic liquefaction and the seismic instabilities of the submarine slopes. All these topics are of paramount importance in order to ensure the post-seismic serviceability conditions of the port area and of the port facilities and also in the perspective of reutilization of the port area. The Geotechnical Section of the Messina University has been recently charged of the evaluation of the seismic stability condition of the port area. In this vein the paper describes the analyses carried out with a numerical model developed to examine the seismic stability conditions of the submarine slopes which mainly consist of liquefiable granular materials. Slope stability conditions are evaluated taking into account the inertial effect and the possibly occurring excess pore water pressures. Displacement analysis is performed using an extension of Newmark’s sliding block model for rotational failure mechanisms taking into account the reduction of slope critical acceleration due to changes in soil shear strength. A parametric analysis has been performed in order to point out those parameters which mostly affect seismic slope response and some useful stability charts are provided.Pubblicazioni consigliate
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