| 1. |
- Alm, Ove, et al.
(författare)
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Microstructures and mechanical characteristics of the Tännäs augen gneiss, Swedish Caledonides
- 1980
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 102:4, s. 319-334
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Tidskriftsartikel (refereegranskat)abstract
- The mechanical behaviour, microstructure and substructure of the classic Tannas augen gneiss of the Swedish Caledonides are presented. Progressive deformation of granodiorite to augen gneiss and mylonite is shown to take place in an isochemical environment with redistribution of megacrysts to surrounding matrix. Experimental deformation of natural rocks from the Tannas Augen Gneiss Nappe has been carried out in the temperature range of 20-600oC and under confining pressure of 100-700MPa. The highest strength found is for the fine-grained mylonite. The augen of the gneiss show brittle behaviour under all test conditions, and temperature has a limited effect on the ultimate strength of the matrix of the augen gneiss. Microstructures have been analysed by means of optical microscopy and transmission electron microscopy. The progressive deformation is brought about by dislocation glide and dislocation creep. Subgrain formation, recrystallization and straining of new grains are observed at all stages of the progressive deformation of the matrix while the augen behavior is brittle
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| 2. |
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| 3. |
- 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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| 4. |
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| 5. |
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| 6. |
- 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
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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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| 7. |
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| 8. |
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| 9. |
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Rock bolting : theory and application in mining and underground construction, Proceedings of the International Symposium
- 1984
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- This conference proceedings contains 58 papers discussing Rock Bolting theory and application in mining and underground construction. Rock reinforcement methods and ground support interaction diagrams are presented. Rock Mechanics principles are applied in the analysis of Rock mass behavior and support mechanisms for underground constructions. The proceedings are divided into 4 sessions: Rock Bolting in theory and experiments, Design principles and experience, Ground Control and Instrumentation, and Cable Bolting.
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| 10. |
- Röshoff, Kennert, et al.
(författare)
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CLAB : an intermediate storage for spent nuclear fuel in Sweden
- 1983
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Ingår i: proceedings: Fifth Congress of the International Society for Rock Mechanics, Melbourne (Australia) 1983. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061912385 ; , s. E151-159
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Konferensbidrag (refereegranskat)
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| 11. |
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| 12. |
- Stephansson, Ove
(författare)
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Mechanical models of jointed rock masses
- 1981
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Ingår i: Geologiska Föreningen i Stockholm Förhandlingar. - : Informa UK Limited. - 0016-786X. ; 103:1, s. 133-134
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 13. |
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| 14. |
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| 15. |
- Stephansson, Ove, et al.
(författare)
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Nuclear power production in an underground chain
- 1984
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Ingår i: Rock mechanics. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061912350 ; , s. 1193-1197
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Konferensbidrag (refereegranskat)
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| 16. |
- Stephansson, Ove
(författare)
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Näsliden project : rock mass investigations
- 1981
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Ingår i: Application of rock mechanics to cut and fill mining. - London : The Institution of Mining and Metallurgy. - 0900488603 ; , s. 145-161
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Konferensbidrag (refereegranskat)abstract
- A new geomechanical model is presented in which the rock mass is treated as an elastic, composite material. Here the joints are treated as weak laminae in a strong matrix of rock. Basic equations for two crossings sets of joints are presented and applied to the rock mass of the Nasliden mine. Application of the theory of transversely isotropic material with stiffness data taken from shear box experiments gives too low values of the equivalent elastic moduli of the rock mass. The geomechanical model can be used to assess the rock mass properties for input into anisotropic, elastic finite-element analysis of structures in rocks.
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| 17. |
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| 18. |
- Stephansson, Ove
(författare)
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Rock stress measuremnet by sleeve fracturing
- 1983
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Ingår i: Rock mechanics for resource development, mining and civil engineering. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061912385 ; , s. F129-F137
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Konferensbidrag (refereegranskat)
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| 19. |
- Stephansson, Ove, et al.
(författare)
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Seismo-tectonics in Fennoscandia
- 1980
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Ingår i: Earth rheology, isostasy and eustasy. - Chichester : John Wiley & Sons. - 047127593X ; , s. 327-337
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Konferensbidrag (refereegranskat)abstract
- Recent studies of seismic risk in Sweden indicate that there are connections between the epi-centres of earthquakes and the tectonics. On the basis of the existing data of seismicity and tectonics, eleven seismo-tectonic zones are suggested for Fennoscandia. The correlation between gravity data, late-glacial movements and the seismo-tectonic zones is found to be positive.
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| 20. |
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| 21. |
- Stephansson, Ove
(författare)
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Sleeve fracturing for rock stress measurement in boreholes
- 1983
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Ingår i: Symposium international reconnaissance des sols et des roches par essais en place : thèmes 1/2/3. ; , s. 571-578
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Konferensbidrag (refereegranskat)abstract
- With the aid of the sleeve fracturing technique, rock deformability and rock stresses can be determined in only one borehole test. Axial borehole fractures are induced without fluid interaction with existing fractures and joints. Sleeve fracturing of blocks is described. Stress determination by means of sleeve fracturing in lava flow of the South Table Mountain, Colorado Test Site, are found to be of the same magnitude and directions as stresses determined by hydrofracturing and overcoring techniques
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