Geotechnical model

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Contents

Overview of a geotechnical program

Site and rock mass characterization

  • Intact rock strength
  • Discontinuities
    • Joints
    • Faults
  • Hydrogeology & hydrology

Mining method selection

  • Significant rock mass characteristics

Geotechnical design

  • Empirical methods
  • Analytical methods
  • Numerical methods

Geotechnical evaluation program components

Site investigation

  • Planning a field / site investigation program
  • Intact strength determination
    • Laboratory compression testing
    • Point-load index testing
    • Hardness index testing
  • Joint mapping
  • Borehole logging techniques
  • Geophysical methods
  • Data analysis

Rock mass classification

  • RMR
  • Q

Structural geology

In situ stresses

Hydrogeology & surface hydrology

  • Field program
  • Data collection and analysis
  • Estimating mine inflows

Components of geotechnical mine design

  • Span design for non-entry stopes
    • Stability graph method
  • Span design for man entry stopes
  • Pillar design
    • Square pillars
    • Rectangular pillars
    • Post pillars
    • Sill pillars
    • Shaft pillars
    • Crown pillars
    • Barrier pillars
    • Yield pillars
    • Boundary & water barrier pillars
  • Mine layout and extraction sequence
    • General considerations
    • Numerical modelling
  • Ground support
    • Anticipated rock mass behaviour
    • Properties of support elements
    • Methods of support design
      • Empirical support design
      • Numerical methods of support design
      • Rules of thumb
      • Q system of support design
    • Support installation methods and equipment
  • Backfill
      • Selection of type
      • Paste backfill
      • Hydraulic backfill
      • Rock backfill
    • Infrastructure for delivery to stopes
    • Backfill equipment requirements
    • Backfill system maintenance
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