Towards a 3D geotechnical model for the Greater Beirut area for seismic ground motion and liquefaction assessment
Résumé
Soil heterogeneity has a strong influence on the seismic ground motion variability. Local conditions (geological and topographical), can generate amplifications of surface motions at specific frequencies. Indeed, depending on the geological configuration of their subsoil or their topography, some sites amplify the seismic motion compared to a reference site. Furthermore, the small-scale heterogeneities of the lithological layers can redistribute the energy of the trapped waves, increasing the variability of the seismic movement recorded at the surface. Moreover, some types of soil, saturated with water, completely lose their cohesion when subjected to cyclic stress, this phenomenon is known as the liquefaction. A 3D geotechnical model of the uppermost geology under the area of Beirut, which is known by the complexity of its geographical location and soil properties, is established. This model will be used in numerical computations based on Final Element Method to simulate the seismic wave propagation. The soil heterogeneities will be considered by a statistical study aiming to estimate the vertical and horizontal correlation lengths of the soil layers mechanical properties from the borehole database. We present here the primary strategies chosen to build the geotechnical model of the Greater Beirut.
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