Assessment of Discrete Element Modelling Parameters for Rock Mass Propagation
The efficiency of a numerical model depends on both the realism of the assumptions it is based on, and on the way its parameters are assessed. We propose a numerical model based on the discrete element method which makes possible, thanks to the definition of an appropriate contact law, to simulate the mechanisms of energy dissipations by friction and shocks during the propagation of an avalanche of granular material on a slope. The parameters of the contact model are obtained from laboratory experiments of single impacts. A particular attention was paid to the values of the run-out, the morphology of the deposit, the proportions of energy dissipations by impacts or friction, and the kinetic energies of translation and rotation. The results of this numerical study provide valuable information on the relevance of some usual assumptions of granular flow continuous models.
KeywordsDiscrete element method Rock avalanches Dissipative contact law Parameter identification Experimental validation
This study was performed as a part of the European project ALCOTRA-MASSA, with financial support from the European Funds For Regional Development (FEDER).
- Allen MP, Tildesley DJ (1989) Computer simulation of liquids. Clarendon, New YorkGoogle Scholar
- Banton J, Villard P, Jongmans D, and Scavia C (2009) Two-dimensionnal discrete element models of debris avalanches: parametrization and the reproductibility of experimental results. J Geophys Res Earth Surf 114: F04013, 15p.Google Scholar
- Cleary PW, Prakash M (2003) Discrete-element modelling and smoothed particle hydrodynamics: potential in the environmental sciences. Philos Trans R Soc A Math Phys Eng Sci 362(1822):2003–2030Google Scholar
- Cundall PA, Dresher A, Strack ODL (1982) IUTAM conference on deformation and failure of granular materials, DelftGoogle Scholar
- Heim A (1932) Bergsturz und Menschenleben. Fretz und Wasmuth Verlag, ZürichGoogle Scholar
- Van Den Bergen G (2003) Collision detection in interactive 3D environments (The Morgan Kaufmann series in interactive 3D technology). Morgan Kaufmann, San FranciscoGoogle Scholar