Elastic wave generated by granular impact on rough and erodible surfaces

被引：22

作者：

Bachelet, Vincent ^{[1
]}

Mangeney, Anne ^{[1
,2
]}

de Rosny, Julien ^{[3
]}

Toussaint, Renaud ^{[4
]}

Farin, Maxime ^{[1
,5
]}

机构：

[1] Univ Paris Diderot, Sorbonne Paris Cite, Inst Phys Globe Paris, CNRS,UMR 7154, F-75005 Paris, France

[2] CNRS, Lab JL Lions, INRIA, ANGE Team, F-75005 Paris, France

[3] PSL Res Univ, CNRS, ESPCI Paris, Inst Langevin, F-75005 Paris, France

[4] Univ Strasbourg, Inst Phys Globe Strasbourg, CNRS, EOST, F-67000 Strasbourg, France

[5] CALTECH, Seismol Lab, Pasadena, CA 91125 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2018年 / 123卷 / 04期

关键词：

SEISMIC SIGNALS; FRENCH ALPS; ROCK-FALL; ROCKFALLS; LOCATION; DYNAMICS; PLATE; FLOW;

D O I：

10.1063/1.5012979

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The elastic waves generated by impactors hitting rough and erodible surfaces are studied. For this purpose, beads of variable materials, diameters, and velocities are dropped on (i) a smooth PMMA plate, (ii) stuck glass beads on the PMMA plate to create roughness, and (iii) the rough plate covered with layers of free particles to investigate erodible beds. The Hertz model validity to describe impacts on a smooth surface is confirmed. For rough and erodible surfaces, an empirical scaling law that relates the elastic energy to the radius R-b and normal velocity V-z of the impactor is deduced from experimental data. In addition, the radiated elastic energy is found to decrease exponentially with respect to the bed thickness. Lastly, we show that the variability of the elastic energy among shocks increases from some percents to 70% between smooth and erodible surfaces. This work is a first step to better quantify seismic emissions of rock impacts in natural environment, in particular on unconsolidated soils. Published by AIP Publishing.

引用

页数：9

共 42 条

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