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Technical Specifications

Analysis Methods

  • Analysis Methods
  • Rigid plate analysis
  • Elastic plate analysis
  • Voussoir (no tension) plate analysis
  • Deterministic or probabilistic analysis type
  • Sensitivity analysis

Failure Modes

  • Shear (vertical slippage at abutments)
  • Elastic buckling
  • Arch snap-thru (buckling due to gravity)
  • Localized crushing failure

File Output

  • Save processed file
  • Export to Excel
  • Export image
  • Copy to clipboard

Geometry Definition

  • Pillar length
  • Pillar width
  • Pillar height
  • Rock unit weight
  • Overburden unit weight
  • Water unit weight
  • Permeable or impermeable pillar
  • Face dip (Voussoir)


  • Info Viewer provides a comprehensive summary of model
  • Input data and analysis results, in a formatted text listing
  • Display Options allows for customized colours, fonts, significant digits, view controls
  • Three-dimensional pillar display
  • Auto-compute results checkbox

Lateral Stress Definition

  • Stress type: Constant or Gravity
  • Water height
  • Overburden thickness
  • Horizontal sigma x; horizontal sigma y (constant stress)
  • Horizontal/vertical Kx; horizontal vertical Ky (gravity stress)
  • Support pressure (Voussoir)

Probabilistic Analysis

  • Probability of failure
  • Monte Carlo or Latin Hypercube sampling method
  • Histogram plot
  • Cumulative plot
  • Scatter plot
  • Highlight failed cases with a factor of safety below a certain value
  • Plot regression line

Shear Strength Criterion

  • Mohr-Coulomb
  • Generalized Hoek-Brown (GSI, mi, D)
  • Generalized Hoek-Brown (mb, s, a)
  • Hoek-Brown

Statistical Distributions

  • Normal
  • Uniform
  • Triangular
  • Beta
  • Exponential
  • Lognormal
  • Gamma
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