Article Dans Une Revue Engineering Geology Année : 2022

Comparison of full-scale rockfall tests with 3D complex-shaped discrete element simulations

Résumé

The analysis of trajectories is often needed to face the rockfall hazards. It is now essential to rene the understanding of the interactions of falling rock blocks with the terrain, depending on involved elements. They include the topology and nature of the soil, but also the volume and shape of the falling blocks. The main objective of this work is to replicate eld observations using a 3D discrete elements model (DEM) in order to assess unreachable data in experiments. The model applied implements blocks of realistic shapes that were reconstructed from in situ blocks, and the dissipation of kinetic energy at the collision point is suitably managed. In the experimental campaign, dozens of boulder (rock block) releases were conducted on two slope proles of a quarry located in Authume (France). Block passing heights, velocities and runout distances were assessed at specic ground points. We analyzed lateral spreads, propagation distances, and energy balances computed for 3 dierent block geometries. These numerical results were confronted with experimental observations. The DEM model is ecient and versatile. It allows to simulate quite accurately a multitude of congurations. Among the multitude of terrain and block properties, geometric features are shown to be crucial. In spite of this, to allow the analysis of the experimental data, a deliberately very basic characterization of the block shape { which is only related to its lengthiness { was chosen for sake of eciency.

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Dates et versions

hal-04819699 , version 1 (04-12-2024)

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Citer

B. Garcia, Pascal Villard, V. Richefeu, D. Daudon. Comparison of full-scale rockfall tests with 3D complex-shaped discrete element simulations. Engineering Geology, 2022, 310, pp.106855. ⟨10.1016/j.enggeo.2022.106855⟩. ⟨hal-04819699⟩

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