Modeling the progressive failure of hard rock pillars

作者：Renani H Rafiei^*; Martin C D

来源：Tunnelling and Underground Space Technology, 2018, 74: 71-81.

DOI：10.1016/j.tust.2018.01.006

• Pillar strength
• CWFS model
• Failure mechanism

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.

• 出版日期2018-4