Hybrid discrete element code for simulation of mining-induced strata movements

Charles H. Dowding, Kevin M. O'connor

Research output: Contribution to journalReview article

5 Scopus citations

Abstract

To simulate the kinematics associated with mining-induced subsidence in a blocky rock mass, a hybrid rigid block model was developed by combining a small displacement code with a large displacement code. Gravity was applied to a rigid block mesh using an implicit formulation and the equilibrium displacements are then used as initial conditions for an explicit analysis in which excavation of a longwall mine panel and subsequent subsidence was simulated. A parameter study was performed to evaluate the influence of rigid block contact stiffness, vertical joint density, and contact roughness on mining-induced strata movements for comparison with previously obtained field measurements. The best agreement between measured and calculated displacements was obtained when a relatively low stiffness value was maintained constant for all contacts. A surprising result was that neither increasing the density of vertical joints nor reducing the rigid block contact roughness improved the agreement between measured and simulated displacements.

Original languageEnglish (US)
Pages (from-to)235-242
Number of pages8
JournalEngineering Computations
Volume9
Issue number2
DOIs
StatePublished - Feb 1 1992

Keywords

  • Mining subsidence
  • Rigid block model
  • Subsurface displacements

ASJC Scopus subject areas

  • Software
  • Engineering(all)
  • Computer Science Applications
  • Computational Theory and Mathematics

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