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Detailed mapping and examination of the site of a large rock burst at the Lucky Friday Mine, Mullan, ID, demonstrated conclusively that damage was caused by a splitting and buckling failure mechanism initiated by separation of rock into layers along steeply dipping metamorphic shear foliation subparallel to the affected crosscut. The thin tablular layers then buckled into the crosscut from both sides. Rigorous control of the burst by these layers suggests practical measures for avoiding bursts in crosscuts in the future by repositioning and reorienting openings so that splitting and buckling are reduced or precluded.
| Author(s): | White-BG, Williams-TJ, Whyatt-JK |
| Reference: | NARMS-TAC 2002: Mining and Tunnelling Innovation and Opportunity, Hammah R, Bawden W, Curran J, Telesnicki M, eds. Vol 2. Toronto, Ontario, Canada: Univ. of Toronto, Toronto, July 7-10, 2002; :1095-1100 |
moals (PDF, 278 KB)
