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Rock Mechanics and Rock Engineering

, Volume 49, Issue 6, pp 2353–2372 | Cite as

Application of a New Rheological Model to Rock Avalanches: An SPH Approach

  • D. ManzanalEmail author
  • V. Drempetic
  • B. Haddad
  • M. Pastor
  • M. Martin Stickle
  • P. Mira
Original Paper

Abstract

Rock avalanches move large volumes of material causing a highly destructive power over large areas. In these events, it is possible to monitor the evolution of slopes but failure cannot be always prevented. For this reason, modelling of the propagation phase provides engineers with fundamental information regarding speed, track, runout and depth. From these data, it is possible to perform a better risk assessment and propose mitigation measures to reduce the potential hazard of specific area. The purpose of this paper is to present a depth integrated, SPH model, which can be used to simulate real rock avalanches and to assess the influence of the rheology on the avalanche properties. The paper compares the performance of different rheological models to reproduce the track, runout and depth of the final deposit for both, scale test and real events such as Frank and Thurwiesier rock avalanches. These sets of benchmarks provide information on the proposed model accuracy and limitations.

Keywords

Rock avalanche propagation modelling Depth-integrated model SPH 

List of symbols

h

Depth-mobilized mass

z

Vertical coordinate of the reference system

v

Depth-averaged velocity (LT−1)

\(\bar{v}\)v

Modulus of the depth-averaged velocity (LT−1)

vh

Velocity at surface (z = h) (LT−1)

eR

Erosion rate (LT−1)

n

Porosity

ρ

Density of the solid-pore fluid mixture (ML−3)

ρs

Density of the solid phase (ML−3)

ρw

Density of the fluid phase (ML−3)

b

Gravity force components along X1 and X2 (LT−2)

b3

Gravity forces along X3 (LT−2)

τb

Basal shear stress (ML−1 T−2)

sb

Basal shear strength (ML−1 T−2)

τ

Shear stress (ML−1 T−2)

τy

Cohesive shear strength (ML−1 T−2)

σm

Effective normal stress (ML−1 T−2)

ϕb

Basal friction angle

ϕ

Friction angle

pwb

Basal pore pressure (ML−1 T−2)

R

Main radius of curvature in the direction of the flow

γ

Shear strain (ML−1 T−2)

μ, μF

Viscosity coefficient for different rheologies

γF

Fluidity coefficient for Perzyna viscoplastic models

ς

Voellmy coefficient

Notes

Acknowledgments

The authors gratefully acknowledge the economic support provided by the Spanish Ministry MINECO (Projects GEODYN and GEOFLOW). The authors gratefully acknowledge the support of the Geotechnical Engineering Office, Civil Engineering and Development Department of the Government of the Hong Kong SAR in the provision of the digital terrain models for the Hong Kong landslide cases. Thanks are given to Dr Manzella for the experimental data concerning the granular avalanche experiments.

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Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  1. 1.ETS Ingenieros de CaminosUniversidad Politécnica de MadridMadridSpain
  2. 2.Universidad de Castilla La ManchaToledoSpain
  3. 3.Centro de Estudios y Experimentación de Obras Públicas (CEDEX)MadridSpain
  4. 4.INTECIN-UBA-UNPSJBCONICETBuenos AiresArgentina

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