Aim of this work is the numerical analysis of the initiation of flowslides in pyroclastic soils due to the increase of water pressure induced by rainfall. Soils are modelled as multiphase deforming porous continuum where heat, water and moist air flow are taken into account. The effective stress state of the solid skeleton is limited by the Drucker-Prager yield surface with linear isotropic hardening, non associated plastic flow and capillary dependent cohesion. Small strains and quasi-static loading conditions are assumed. Numerical results of the real case occurred on May 1998 in the south part of Italy are described. It is shown that the first failure of the lower part of the slope is captured, as observed in situ and that the rainfall history, as well as the pore pressure regime, are important to determine the first-failure occurrence of the flowslide.
Numerical Analysis of Flowslides Initiation based on Porous Media Mechanics
SANAVIA, LORENZO;SCHREFLER, BERNHARD;
2008
Abstract
Aim of this work is the numerical analysis of the initiation of flowslides in pyroclastic soils due to the increase of water pressure induced by rainfall. Soils are modelled as multiphase deforming porous continuum where heat, water and moist air flow are taken into account. The effective stress state of the solid skeleton is limited by the Drucker-Prager yield surface with linear isotropic hardening, non associated plastic flow and capillary dependent cohesion. Small strains and quasi-static loading conditions are assumed. Numerical results of the real case occurred on May 1998 in the south part of Italy are described. It is shown that the first failure of the lower part of the slope is captured, as observed in situ and that the rainfall history, as well as the pore pressure regime, are important to determine the first-failure occurrence of the flowslide.Pubblicazioni consigliate
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