Modeling the progressive failure of hard rock pillars

Modeling the progressive failure of hard rock pillars An enhanced cohesion weakening and friction strengthening model is proposed to simulate the progressive failure of hard rock pillars using two- and three-dimensional finite difference analysis. The documented behavior of 85 pillars in two mines was used for model validation. The numerical models successfully separated unstable/failed pillars from stable pillars and also captured the observed mechanism of progressive failure in hard rock pillars. Pillar stress-strain curves indicated that while pillars with W/H < 2 exhibit strain softening, wider pillars begin to display strain hardening. It was shown that strength of wide pillars may be overestimated by conventional models using empirically estimated parameters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tunnelling and Underground Space Technology Elsevier

Modeling the progressive failure of hard rock pillars

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0886-7798
D.O.I.
10.1016/j.tust.2018.01.006
Publisher site
See Article on Publisher Site

Abstract

An enhanced cohesion weakening and friction strengthening model is proposed to simulate the progressive failure of hard rock pillars using two- and three-dimensional finite difference analysis. The documented behavior of 85 pillars in two mines was used for model validation. The numerical models successfully separated unstable/failed pillars from stable pillars and also captured the observed mechanism of progressive failure in hard rock pillars. Pillar stress-strain curves indicated that while pillars with W/H < 2 exhibit strain softening, wider pillars begin to display strain hardening. It was shown that strength of wide pillars may be overestimated by conventional models using empirically estimated parameters.

Journal

Tunnelling and Underground Space TechnologyElsevier

Published: Apr 1, 2018

References

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