Calibration of the limit equilibrium pillar failure model using physical models

The limit equilibrium model, used in displacement discontinuity codes, is a popular method to simulate pillar failure. This paper investigates the use of physical modelling calibrate this model. For experiments, an artificial material was prepared and cubes were poured using standard 100 mm χ civil engineering concrete moulds. friction angle between platens testing machine varied by soap sandpaper. Different modes failure observed depending on angle. Of interest that significant loadshedding recorded for some specimens which visually remained mostly intact. highlights difficulty classifying pillars as failed or intact underground stopes where spalling observed. laboratory models enabled more precise calibration model compared previous attempts. Guidelines assist with are given paper. appears be useful approximation it could stress-strain behaviour models.