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.
Tunnelling and Underground Space Technology – Elsevier
Published: Apr 1, 2018
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