Geomechanics and Engineering

Techno-Press (테크노프레스)
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Flow models of fluidized granular masses with different basal resistance terms

  • Wu, Hengbin (College of Civil Engineering, Chongqing Three Gorges University) ;
  • Jiang, Yuanjun (Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards & Environment, Chinese Academy of Sciences) ;
  • Zhang, Xuefu (State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University)
  • Received : 2014.09.01
  • Accepted : 2015.02.14
  • Published : 2015.06.25
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Abstract

Proper modelling of the basal resistance terms is key in simulating the motion of fluidized granular flow. In this paper, standard depth-averaged governing equations of granular flow are used together with the classical Coulomb, Voellmy, and velocity dependent friction models (VDFM). A high-resolution modified TVDLF method is implemented to solve the partial differential equations without numerical oscillations. The effects of basal resistance terms on the motion of granular flows such as geometric shape evolution, travel times and final deposits are analyzed. Based on the numerical results, the predictions of the front and rear end positions and developing length of granular flow with Coulomb friction model show excellent agreements with experiment results reported by Hutter et al. (1995), and illustrate the validity of the numerical approach. For the Voellmy model, the higher value of turbulent coefficient than reality may obtain more reasonable predicted runout for the small-scale avalanche or granular flow. The energy exchange laws indicate that VDFM is different from the Coulomb and Voellmy models, although the flow characteristics of both three models fit the measurements and observations very well.

Keywords

References

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