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Post pillars are created when mechanized cut-and-fill stopes are mined on all sides. A FLAC model studies the potential instability of the pillars. Axisymmetric geometry in FLAC provides a reasonable representation of the three-dimensional condition.

Keywords:

• Post-pillar
• Cut-and-fill
• Stress
• Displacements
• Mining stages
• Axisymmetric
• Mohr-Coulomb model
• Double-Yield model

Materials:

• Backfill
• Rock

Analyses:

• Static