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July 1, 2009
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CPillar 3.0
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Crown Pillar and Roof Beam Stability Analysis

CPillar is a quick, simple to use analysis tool for evaluating the stability of surface or underground crown pillars and laminated roof beds. Analysis methods include rigid or elastic analysis and voussoir (no tension) analysis, for pillar, beam or plate configurations.



Statistical analysis of failure probability can be carried out by entering standard deviations for material and loading parameters. With CPillar you can quickly create a model, calculate safety factors and failure probabilities and interpret the results.

CPillar provides an integrated graphical environment for data entry and 3D model visualization. A CAD based modeler allows for point and click data input and editing. Popup windows allow for easy entry and modification of input parameters.



  • Strength Criteria
    • - Hoek-Brown
    - Mohr-Coulomb
    - Hoek-Brown (RMR) - m and s constants calculated from rock mass rating and
       intact m value
  • Lateral Stresses
    • - Constant
    - Gravitational
  • Geometry
    • - Surface/underground crown pillars
    - Roof beams (long excavation)
    - Roof plates
    - Overburden
    - Water height
  • Statistical Analysis
    • - Enter standard deviations for material and loading parameters to obtain mean
       safety factors and failure probabilities
  • Failure Modes
    • - Rigid - shear at abutments
    - Elastic - shear at abutments and elastic buckling
    - Voussoir - shear, arch snap-thru (gravity buckling) and crushing
  • Analysis Methods
    • - Rigid Analysis
    - Elastic Analysis
    - Voussoir analysis
  • Miscellaneous
    • - Automatic calculation of rock mass modulus from rock mass rating
    - Specify dip angle and support pressure for voussoir analysis
    - Full screen / cropped image capture direct to PCX file or printer
    Documentation
      Reference Manual
    HOME    |    © 2009 Rocscience Inc.    |    Last Updated June 26, 2009