4.7 Article

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

期刊

ENGINEERING GEOLOGY
卷 310, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.enggeo.2022.106855

关键词

Rockfall; Real -scale tests; Discrete elements method; Shape effect; Hard and soft grounds

资金

  1. French company IMSRN
  2. French National Association for Research and Technology (ANRT) [2016/0134]

向作者/读者索取更多资源

This paper discusses the use of a 3D discrete elements model to replicate field observations for further analysis of potential rockfall hazards. Through experiments involving releasing large rock blocks and assessing parameters such as propagation distance, velocity, and energy balance, the importance of geometric features in rockfall analysis is highlighted.
Trajectory analysis is often needed to handle rockfall hazards. It is crucial to understand and to refine ground and rock interactions during a rockfall, which can be related to the elements involved. They include the topology, ground and rock nature, but also the volume and shape of the falling blocks. This work focuses on replicating field observations using a 3D discrete elements model (DEM) in order to further analyze the possible rockfall deposition areas, which may not be accessible due to the limited number of experimental data available. The numerical model implements blocks of more realistic shapes that were reconstructed from in situ blocks obtained by photogrammetry. The dissipation of kinetic energy at the collision point is suitably managed. In the exper-imental campaign, dozens of boulders (rock block) releases were conducted on two slope profiles of a quarry located in Authume (France). Block passing heights, velocities and runout distances were assessed at specific ground points. We analyzed lateral spreads, propagation distances, and energy balances computed for 3 different block geometries. These numerical results were confronted with experimental observations. Although time-consuming compared to lumped mass and rigid body dynamics models where the impact duration is zero, the DEM used in this work is versatile thanks to an explicit consideration of geometrical effects throughout the life of multiple contacts. It allows to simulate quite accurately a multitude of configurations. Among the properties of the terrain and the blocks, geometric features are shown to be crucial. For the sake of efficiency, a simplified shape coefficient based on block's elongation is proposed.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据