Simple physical model for the fragmentation of rock avalanches

被引：0
作者：
Fabio V. De Blasio
Giovanni B. Crosta
机构：
[1] Università degli Studi di Milano Bicocca,Dipartimento di Scienze Geologiche e Geotecnologie
来源：
Acta Mechanica | 2014年 / 225卷
关键词：
Grain Size Distribution; Granular Medium; Rock Avalanche; Force Chain; Fragmentation Energy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Rock avalanches are the largest granular flows on Earth. In contrast to artificial, small-scale granular avalanches, they exhibit a large degree of fragmentation with reduction of average grain volume by a factor of up to 1015–1018. Even though fragmentation likely affects the whole dynamics of the rock avalanche, as yet the basic mechanics of the process is poorly known. In this work, a simple model is presented for the fragmentation of rock avalanches, assuming that most of the fragmentation occurs along force chains in the granular medium. The landslide motion is simulated along a curved bumpy profile path. The predicted grain spectra are found to agree reasonably with field data.
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页码：243 / 252
页数：9
相关论文
共 56 条
[1]  
Bowman E.T.(2012)Physical models of rock avalanche spreading behaviour with dynamic fragmentation Can. Geotech. J. 49 460-476
[2]  
Take W.A.(2001)Modelling comminution devices using DEM Int. J. Numer. Anal. Methods Geomech. 25 83-105
[3]  
Rait K.L.(2004)Replay of the 1987 Val Pola Landslide, Italian Alps Geomorphology 60 127-146
[4]  
Hann C.(2009)Numerical modeling of 2-D granular step collapse on erodible and non erodible surface J. Geophys. Res. 114 F03020-55
[5]  
Cleary P.(1968)Etudes statistique des forces intergranulaires dans un milieu pulverulent Geotechnique 18 50-79
[6]  
Crosta G.B.(2009)The role of dynamic rock fragmentation in reducing frictional resistance to large landslides Eng. Geol. 109 67-184
[7]  
Chen H.(2009)Rheology of a wet, fragmenting granular flow and the riddle of the anomalous friction of large rock avalanches Granul. Matter 11 179-382
[8]  
Lee C.F.(2011)Dynamical stress in force chains of granular media travelling on a bumpy terrain and the fragmentation of rock avalanches Acta Mechanica 221 375-110
[9]  
Crosta G.B.(2012)Substrate effects from force chain dynamics in dense granular flows J. Geophys. Res. 117 F01028-5244
[10]  
Imposimato S.(1986)Flowing, bouncing, sliding: synopsis of basic mechamisms Acta Mechanica 64 101-2382
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