HR: 0800h
AN: H21A-1329    [Abstracts]
TI: Numerical Evidences of the Effect of the Earth Pressure Coefficients on the Runout of a Mass
AU: * Pirulli, M
EM: marina.pirulli@polito.it
AF: Politecnico di Torino - Department of Structural and Geotechnical Engineering, Corso Duca degli Abruzzi 24, Torino, 10129 Italy
AU: Mangeney, A
EM: mangeney@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris - Departement de Modelisation Physique et Numerique, 4 Place Jussieu, Paris, 75252 France
AU: Scavia, C
EM: claudio.scavia@polito.it
AF: Politecnico di Torino - Department of Structural and Geotechnical Engineering, Corso Duca degli Abruzzi 24, Torino, 10129 Italy
AU: Bristeau, M
EM: Marie-Odile.Bristeau@inria.fr
AF: Institut National de Recherche en Informatique et en Automatique, Domain de Voluceau BP 105, Le Chesnay Cedex, 78153 France
AB: Numerical simulation can provide a useful tool for investigating the dynamics of phenomena like rock avalanches, within realistic geological contexts and in the framework of a better risk assessment and decision making. The major difficulties in numerical modelling are linked to the complex behaviour of such phenomena and of the underlying topography. The numerical model presented here uses the long wave approximation in which the characteristic length in the flowing direction is generally much larger than the vertical one, e.g. the avalanche thickness, as in classical Saint-Venant models for shallow water. Through numerical observations on the small-scale laboratory experiments described in Gray et al. (1999) the applied numerical model is changed from the assumption of isotropy of normal stresses to a condition in which the earth pressure coefficients follow the Savage and Hutter (1989) equations (anisotropy). Simulations carried out have been also precious to underline the necessity of separating the behaviour of the mass along the direction of propagation respect the direction transversal to it. By consequence, extensions and new perspectives in the numerical simulation will be focused on the possibility of introducing a condition of anisotropy that compared with the actual formulation allows to split earth pressure coefficients as in McDougall and Hungr (2004).
DE: 1824 Geomorphology: general (1625)
DE: 1847 Modeling
DE: 1849 Numerical approximations and analysis
DE: 3200 MATHEMATICAL GEOPHYSICS (0500, 4400, 7833)
SC: Hydrology [H]
MN: Fall Meeting 2005