Numerical analysis of the grain size distribution in the activation of dry debris flow by means of DEM

  • Gerardo Arévalo-Mendoza Pontificia Universidad Javeriana
  • Alfonso M. Ramos-Cañón Pontificia Universidad Javeriana
  • Luis F. Prada-Sarmiento Pontificia Universidad Javeriana
Keywords: Debris flow, grain size distribution, discrete element method, rotating drum, depth flow

Abstract

Debris flow is a process of granular nature that has been widely analysed with methodologies based upon continuum mechanics. However, those approaches do not take into account the real granular condition of the soil. Grain size distribution exerts an important control on the movement of debris flows. This behaviour can be studied by analyzing three variables: maximum tilt angle (θ), kinetic energy (Ek) and flow depth (Fd). These variables allow to obtain a deeper insight into the conditions that trigger the failure of slopes and its subsequent capacity of damage. This research resorts to the use of the discrete element technique, developed by [1], performing a parametrical study of the parameters controlling grain size distributions like: mean size (d50), coefficient of curvature (Cu) and maximum size (dmax). The results showed an important influence and also a strong interaction between Ek and Fd on the onset of granular flows. The angle θ reached on the surface has a variation less than 5º with extreme values of d50. Results reported herein, allow to recognize the influence of grain size distribution on the triggering of slides of granular materials.

Author Biographies

Gerardo Arévalo-Mendoza, Pontificia Universidad Javeriana
Ingeniero Civil, Departamento de Ingeniería Civil, Pontificia Universidad Javeriana, Bogotá
Alfonso M. Ramos-Cañón, Pontificia Universidad Javeriana
Doctor en Ingeniería, MSc en Geotecnia, Ingeniero Civil, Instituto Geofísico, Facultad de Ingeniería, Pontificia Universidad Javeriana, Bogotá
Luis F. Prada-Sarmiento, Pontificia Universidad Javeriana
Doctor en Ingeniería, Ingeniero Civil, Departamento de Ingeniería Civil, Pontificia Universidad Javeriana, Bogotá

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How to Cite
[1]
G. Arévalo-Mendoza, A. M. Ramos-Cañón, and L. F. Prada-Sarmiento, “Numerical analysis of the grain size distribution in the activation of dry debris flow by means of DEM”, TecnoL., vol. 20, no. 38, pp. 95-106, Feb. 2017.

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Published
2017-02-21
Section
Research Papers
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