Post-Peak Pillar Behavior and the Effects of Backfill Confinement

Software

Version Notes:
FLAC 8.0

Level: Intermediate
Runs in Demo: No

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FLAC is applied to study the behavior of progressively collapsing pillars. The effect of backfill confinement is evaluated by comparing different scenarios: no backfill, tight backfill and backfill with a 10 cm gap between the backfill and the roof. The peak/residual strength of the pillar is simulated using the strain-softening material model in FLAC, and the pore-collapse behavior of the backfill is simulated using the double-yield material model.

Keywords:

  • Backfill
  • Pillar deformation
  • Sliding contact
  • Strain- Softening model
  • Double-Yiled model
  • Residual stress

Materials:

  • Backfill
  • Rock
  • Talc

Analyses:

  • Static
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