21. |
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22. |
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23. |
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24. |
- Björnfot, Folke, et al.
(författare)
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Interaction of grouted rock bolts and hard rock masses at variable loading in a test drift of the Kiirunavaara mine, Sweden
- 1984
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Ingår i: Rock bolting. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061915147 ; , s. 377-395
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Konferensbidrag (refereegranskat)abstract
- description is presented on the interaction between a reinforced drift and the surrounding rock. It attempts to explain the support mechanisms and characteristics of cement grouted rock bolts, as used in hard rock mining and underground construction. A 20 m long section of a test drift at the 514 m level in the Kiirunavaara Mine, was instrumented with 20 rock bolts mounted with strain gauges and linked to a data logger, and 50 bolts combined with single-anchor extensometer. Rock movements were measured with 23 borehole extensometers, 45 convergence measurement stations, and precise levelling. 14 stress monitors recorded changes in the tangential stresses in the surrounding rock mass.
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27. |
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28. |
- Borg, Torgny, et al.
(författare)
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Stability prediction for the Zinkgruvan mine, central Sweden
- 1984
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Ingår i: Design and performance of underground excavations. - London : British Geotechnical Society. - 0727702114 ; , s. 113-121
-
Konferensbidrag (refereegranskat)abstract
- The geomechanics of the Zinkgruvan Mine are presented. A new approach for performing rock stress measurements in open stopes and drifts was tested. An elastic FEM model and strain failure criteria were applied to predict the future condition of the mine. Limits of the strain failure criteria were based on strain values obtained from the model, observations of rock falls, and major failures in the mine. These limits were used to assess suitable panel height, sill pillar dimensions, and sequence delays for mining parallel ore bodies.
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