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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Rockfall rebound: Comparison of detailed field experiments and alternative modelling approaches
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Rockfall rebound: Comparison of detailed field experiments and alternative modelling approaches

机译：落石反弹：详细野外实验与替代建模方法的比较

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摘要

The accuracy of rockfall trajectory simulations mainly rests on the calculation of the rebound of fragments following their impact on the slope. This paper is dedicated to the comparative analysis of two rebound modelling approaches currently used in rockfall simulation using field experiments of single rebounds. The two approaches consist in either modelling the rock as a single material point (lumped mass approach) or in explicitly accounting for the fragment shape (rigid body approach). A lumped mass model accounting for the coupling between translational and rotational velocities and introducing a slope perturbation angle was used. A rigid body approach modelling the rocks as rigid locally deformable (in the vicinity of the contact surface) assemblies of spheres was chosen. The comparative analysis of the rebound models shows that both of them are efficient with only a few parameters. The main limitation of each approach are the calibration of the value of the slope perturbation ('roughness') angle, for the lumped mass approach, and the estimation of the rock length and height from field geological and historical analyses, for the rigid body approach. Finally, both rebound models require being improved in a pragmatic manner to better predict the rotational velocities distribution.
机译：落石轨迹模拟的准确性主要取决于碎片对坡度影响后回弹的计算。本文致力于使用单回弹的野外实验对目前在落石模拟中使用的两种回弹建模方法进行比较分析。两种方法都包括将岩石建模为单个材料点（集中质量方法）或明确考虑碎片形状（刚性体方法）。使用了集中质量模型，该模型考虑了平移速度和旋转速度之间的耦合并引入了坡度摄动角。选择了一种将岩石建模为球体的局部可变形（在接触表面附近）的刚体方法。对回弹模型的比较分析表明，这两个模型仅需几个参数即可有效。每种方法的主要局限性是：对于集总质量方法，校准坡度扰动（“粗糙度”）角的值;对于刚体方法，根据野外地质和历史分析估算岩石的长度和高度。最后，两个回弹模型都需要以务实的方式进行改进，以更好地预测转速分布。

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