期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 74, 期 -, 页码 71-81出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2018.01.006
关键词
Pillar strength; CWFS model; Failure mechanism
资金
- Swedish Nuclear Fuel and Waste Management Co. (SKB) Sweden
- Canadian Nuclear Waste Management Organization (NWMO)
- Natural Sciences and Engineering Research Council of Canada
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.
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