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CPillar Overview

CPillar is a simple to use, interactive software tool for assessing the stability of surface or underground crown pillars as well as laminated roof beds. It offers three different limit equilibrium analysis methods:

  • Rigid Plate analysis
  • Elastic Plate analysis; and
  • Voussoir (no tension) Plate analysis.

CPillar stability can be assessed using:

In a Deterministic analysis, CPillar calculates the Factor of Safety for a pillar of known dimensions and other input parameters. In a Probabilistic analysis the program allows users to specify statistical distributions for various input parameters, and the number of simulations required. CPillar then computes the Probability of Failure of the pillar by running the analysis the specified number of times, each time generating different values for the stochastic input parameters.

Other important modelling features in CPillar analysis include:

The assumed failure mode(s) considered are dependent upon the Analysis Method chosen.

For a summary and diagram of typical pillar geometry, see the Overview of CPillar Input topic.

For a detailed description of the methods and equations used in CPillar to calculate the planar rock slope stability, see CPillar Theory Manual.

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