rocscience Software
Rocscience CPillar
Support Estimation Using Ground Reaction Curves
Features in CPillar
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)
Interface
- 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
CPillar across Applications
Assess the risk of crown pillar failures using probabilistic analysis, as part of underground mine closure planning and decommissioning.
Analyze the stability of surface crown pillars under gravitational loading, while taking into account shear strength, lateral stress, and water pressure effects acting at the abutments.
Determine the maximum roof span using Rigid, Voussoir, Elastic, or Empirical methods.
Explore the latest features in CPillar
- Polygonal Pillar Geometry
- Locked-In Stress
- New Plate Bending Analysis Formulation for Elastic Analysis
Conduct Rigid Analysis (plug failure) on custom polygonal-shaped pillars of uniform thickness with optional non-vertical pillar abutments.
Define locked-in stress, and principle lateral stresses to model in-situ stress conditions. Locked in stress option is available when using Gravity lateral stress type to set the lateral stress at the pillar surface to a non-zero value.
Analyze two-way plate bending of rectangular plates with clamped-edge boundary conditions, following the method from Theory of Plates and Shells (Timoshenko, 1969). Considers Elastic Buckling failure mode due to bending, and factored shear failure along the abutments.
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