# CPillar

## Crown Pillar Stability Analysis

Get quick and easy stability analysis of surface or underground crown pillars and laminated roof beds using three different limit equilibrium analysis methods: rigid plate, elastic plate, and Voussoir (no tension) plate analysis.

## Sensitivity & Probabilistic Analysis

Perform probabilistic analysis to determine the probability of failure. Model variability in geometry, point of force application, joint and bedding strength, water pressure, external loads and more by assigning statistical distributions to variables. Perform sensitivity analysis using a range of values to evaluate the effects of changing model parameters on factor of safety.

## Empirical Design Method

Originally developed for steeply dipping ore body geometries, by estimating crown geometry and assessing the stope geometry as steep or shallow, you can apply the most appropriate empirical relationships to your model.

## CPillar Across Applications

• Mining
• Excavations
• Roof Pillars

### Mining

Assess the risk of crown pillar failures using probabilistic analysis, as part of underground mine closure planning and decommissioning.

### Excavations

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.

### Roof Pillars

Determine the maximum roof span using Rigid, Voussoir, Elastic, or Empirical methods.

## The Latest Features

• ### Polygonal Pillar Geometry

Conduct Rigid Analysis (plug failure) on custom polygonal-shaped pillars of uniform thickness with optional non-vertical pillar abutments.

• ### Locked-In Stress

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.

• ### New Plate Bending Analysis Formulation for Elastic Analysis

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.

## Grow With Our Learning Resources

Explore our Learning Resources and User Guides, designed to help you excel with all of your geotechnical projects, whether you are a practicing engineer, an academic or a student.
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Rocscience's 2020 - Year in Review

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Announcing the Rocscience Product Roadmap for 2019-2020

## CPillar

### Personal Lease

USD / year
• One Seat
• One User Device
• Cloud-Hosted Licensing
• Managed in the RocPortal

### Flexible Lease

USD / year
• Multiple Seats
• 5 User Devices Per Seat
• Cloud-Hosted Licensing
• Managed in the RocPortal