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Simulation of rock caving process using Mesh-free method

Conference Paper


Abstract


  • Understanding the caving process and material flow is fundamental to block and sublevel cave mining, and

    also longwall mining in sedimentary deposits. However, due to complexity of the structure ofthe rock mass

    and its behaviour, the caving process is rarely understood and cannot be described by simple mathematical

    models. Numerical methods that solve the governing partial differential equations with appropriate

    boundary conditions have been employed in modelling geomechanics problems. Notably, mesh-based finite

    element, boundary element and finite difference methods or combinations of these methods have been

    employed effectively for stress analysis for simulating rock excavations. However, when modelling caving

    processes, such as block caving, sublevel caving and longwall caving, the traditional mesh-based continuum

    approaches may fail to simulate such a process due to large material movement, fracture and fragmentation.

    This is mainly due to inaccuracies arising from mesh distortions resulting in spurious and ill conditioned

    models, and their deficiency to capture large material flows and fragmentations. In this paper, an

    application of a mesh-free method, called smoothed particle hydrodynamics (SPH), is demonstrated for

    simulating rock caving in a stratified deposit. The advantages for simulating caving processes using a

    mesh-free numerical framework are highlighted. Two different examples are chosen, one with elastic-brittle

    material behaviour with a large yield strength (failure by brittle fracture) and the other with elasto-plastic

    material behaviour with a relatively lower yield strength to allow ductile deformation of the rock mass. The

    modelling results capture the mechanistic aspects observed in caving processes. It is shown that the largescale

    deformation and the associated fracture processes in caving can be effectively simulated using SPH. In

    the authors' knowledge, this work is the first attempt in demonstrating the application of a mesh-free method

    for simulati~g caving processes.

UOW Authors


  •   Karekal, Shivakumar
  •   Das, Raj (external author)
  •   Mosse, Luke (external author)
  •   Cleary, Paul W. (external author)

Publication Date


  • 2010

Citation


  • Karekal, S., Das, R., Mosse, L. & Cleary, P. W. (2010). Simulation of rock caving process using Mesh-free method. In Y. Potvin (Eds.), Second International Symposium on Block and Sublevel Caving (pp. 509-522). Australia: Australian Centre for Geomechanics.

Start Page


  • 509

End Page


  • 522

Abstract


  • Understanding the caving process and material flow is fundamental to block and sublevel cave mining, and

    also longwall mining in sedimentary deposits. However, due to complexity of the structure ofthe rock mass

    and its behaviour, the caving process is rarely understood and cannot be described by simple mathematical

    models. Numerical methods that solve the governing partial differential equations with appropriate

    boundary conditions have been employed in modelling geomechanics problems. Notably, mesh-based finite

    element, boundary element and finite difference methods or combinations of these methods have been

    employed effectively for stress analysis for simulating rock excavations. However, when modelling caving

    processes, such as block caving, sublevel caving and longwall caving, the traditional mesh-based continuum

    approaches may fail to simulate such a process due to large material movement, fracture and fragmentation.

    This is mainly due to inaccuracies arising from mesh distortions resulting in spurious and ill conditioned

    models, and their deficiency to capture large material flows and fragmentations. In this paper, an

    application of a mesh-free method, called smoothed particle hydrodynamics (SPH), is demonstrated for

    simulating rock caving in a stratified deposit. The advantages for simulating caving processes using a

    mesh-free numerical framework are highlighted. Two different examples are chosen, one with elastic-brittle

    material behaviour with a large yield strength (failure by brittle fracture) and the other with elasto-plastic

    material behaviour with a relatively lower yield strength to allow ductile deformation of the rock mass. The

    modelling results capture the mechanistic aspects observed in caving processes. It is shown that the largescale

    deformation and the associated fracture processes in caving can be effectively simulated using SPH. In

    the authors' knowledge, this work is the first attempt in demonstrating the application of a mesh-free method

    for simulati~g caving processes.

UOW Authors


  •   Karekal, Shivakumar
  •   Das, Raj (external author)
  •   Mosse, Luke (external author)
  •   Cleary, Paul W. (external author)

Publication Date


  • 2010

Citation


  • Karekal, S., Das, R., Mosse, L. & Cleary, P. W. (2010). Simulation of rock caving process using Mesh-free method. In Y. Potvin (Eds.), Second International Symposium on Block and Sublevel Caving (pp. 509-522). Australia: Australian Centre for Geomechanics.

Start Page


  • 509

End Page


  • 522