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| 2. |
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| 3. |
- Hakami, H., et al.
(författare)
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Gauged sleeve for controlled testing of rock
- 1987
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Ingår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. - : Elsevier BV. - 0148-9062 .- 1879-2073. ; 24:6, s. 375-378
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Tidskriftsartikel (refereegranskat)abstract
- Electrical resistance strain gages, each 5 cm in length, were embedded at a depth of 1 mm, inside a Cil Monothane sleeve of thickness 2 mm. Cil Monothane A80 is a single component and non-toxic, heat-cure-pour polyurethane elastomer. It has sound elasto-plastic properties when cured. It was supplied by Compounding Ingredients Ltd, England. The strain gages cover about 95% of the circumference of the sleeve. The position of the strain gages corresponds to the mid-height of the rock sample
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| 4. |
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| 5. |
- Bjarnason, B., et al.
(författare)
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New developments in hydrofracturing stress measurements at Luleå University of Technology
- 1989
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Ingår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. - : Elsevier BV. - 0148-9062 .- 1879-2073. ; 26:6, s. 579-586
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Tidskriftsartikel (refereegranskat)abstract
- Instrument and theoretical developments in hydrofracturing stress measurements at Lulea University of Technology since the first workshop in Monterey in 1981 are described and the general experience with the method in Sweden is summarized. A new field unit is described which includes a 1000-m long multihose and a 100 MPa water pump. Stress measurements by means of injection tests on preexisting fractures have been introduced and applied at two sites in Sweden. A theory has been developed which permits estimation of the maximum and minimum horizontal stresses in cases where transverse hydrofractures are created in the borehole wall instead of axial.
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| 6. |
- Bjarnason, Bjarni, et al.
(författare)
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The Bolmen project
- 1986
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 13. |
- Mathis, James I., et al.
(författare)
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Heat induced fracturing of rock in an existing uniaxial stress field
- 1986
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Ingår i: Scientific basis for nuclear waste management IX. - Pittsburgh, Pa : Materials Research Society. - 0931837154 ; , s. 799-807
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Konferensbidrag (refereegranskat)abstract
- The Stripa project was designed to test the agreement between theoretical and actual rock fracture times of a rock block loaded with a physical as well as a thermal load. Laboratory testing consisted of physically loading center-drilled cubes of rock, 0. 3 m on a side, uniaxially from 0 to 25 MPa. These were then thermally loaded with a nominal 3. 7 kW (factory rating) cylindrical heater until failure occurred. This time to failure was recorded for comparison with a direct mathematical and a finite element solution. For both cases, calculations were performed at specific time-steps and an estimated failure time calculated from the compiled results.
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| 14. |
- Nordell, Bo, et al.
(författare)
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Fracturing of a pilot plant for borehole heat storage in rock
- 1986
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Ingår i: Tunnelling and Underground Space Technology. - : Elsevier BV. - 0886-7798 .- 1878-4364. ; 1:2, s. 195-208
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes research on a pilot plant in Luleå, Sweden. The plant consists of 19 boreholes, 52 mm in diameter, for heat supply and extraction; and 10 boreholes for temperature monitoring. All the boreholes are 21 m deep. The report describes in detail the performance and results of rock mass permeability and borehole permeability tests. It also discusses hydraulic fracturing and explosive fracturing in the boreholes. A simulation model of water flow in the test plant is described. The paper includes conclusions from the test results and recommendations for further study.
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| 17. |
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| 18. |
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| 19. |
- Stephansson, Ove, et al.
(författare)
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Fennoscandian stress
- 1987
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Ingår i: Abstracts and timetable for the inter-disciplinary symposia. ; , s. 1116-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 20. |
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| 21. |
- Stephansson, Ove, et al.
(författare)
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Hydraulic fracturing stress measurements at Forsmark and Stidsvig, Sweden
- 1986
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Ingår i: Bulletin of the Geological Society of Finland. - : The Geological Society of Finland. - 0367-5211 .- 1799-4632. ; :58, part 1, s. 307-333
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a new development in the use of a multi-hose for hydraulic fracturing, for estimation of in-situ stresses in the Earth's crust. The test procedure and evaluation on hydraulic fracturing in the first and second breakdown method is described. Hydraulic fracturing was performed in Precambrian gneissic rocks at depths down to 500 m in one borhole at Forsmark, Centra Sweden, and down to 150 m in three boreholes at Stidsvig, Southern Sweden. Tests were conducted in both 76 and 56 mm boreholes. The hydraulic fracturing tests at Forsmark follow a stress pattern calculated from the second breakdown method, and excluding the influence of pore pressure.
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| 23. |
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| 24. |
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| 25. |
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| 26. |
- Stephansson, Ove
(författare)
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Ridge push and glacial rebound as rock stress generators in Fennoscandia
- 1988
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Ingår i: Bulletin of the Geological Institutions of the University of Uppsala. - 0302-2749. ; 14, s. 39-48
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Tidskriftsartikel (refereegranskat)abstract
- Assessment of crustal stresses shows that they cannot be explained solely on basis of glacially induced stress and remaining isostatic rebound from Weichselian glaciation. It is therefore suggested that remaining excess horizontal stress is caused by ridge push applied by Mid-Atlantic Ridge
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| 27. |
- Stephansson, Ove
(författare)
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Rock mechanics in Sweden
- 1989
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Ingår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. - : Elsevier BV. - 0148-9062 .- 1879-2073. ; 26:1, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- This paper reviews rock mechanics research activities in Sweden. A short history of the development of rock mechanics in the mining, underground construction and mining equipment industries is presented. Teaching at Swedish technical universities and activity in research organizations and in the Swedish National Group of the ISRM are outlined. For the next 5-10 yr, most of the applied rock mechanics research will be conducted in the fields of mining and the final disposal of radioactive waste. New fields in the application of rock mechanics are being developed, for example, gas storage in excavations of hard rocks. Tunnel boring in hard rocks, holography for rock monitoring during blasting, physical and numerical modelling of grouting and some new trends in rock stress measurements are presented as examples of present research work within the major research organizations and university departments in Sweden.
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| 28. |
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| 29. |
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| 30. |
- Stephansson, Ove, et al.
(författare)
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Rock stress and rock stress measurements : a review
- 1988
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Ingår i: Modelling of mine structures. - : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061918472 ; , s. 3-15
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Konferensbidrag (refereegranskat)
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| 31. |
- Stephansson, Ove, et al.
(författare)
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State of stress in Fennoscandia
- 1986
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Ingår i: Rock stress and rock stress measurements. - Luleå : CENTEK. - 918699817X ; , s. 21-32
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Konferensbidrag (refereegranskat)
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| 32. |
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| 33. |
- Stephansson, Ove
(författare)
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Swedish research co-operation with developing countries : Nicaragua as an example
- 1985
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Ingår i: Raw Materials Report : Journal of Mineral Policy, Business and Environment. - : Informa UK Limited. - 0349-6287. ; 3:1, s. 46-47
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Tidskriftsartikel (refereegranskat)abstract
- Examines the current programme of the Swedish Agency for Research Co-operation with Developing Countries, with emphasis on the co-operation with Nicaragua
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| 34. |
- Sun, Z., et al.
(författare)
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Rock joint compliance tests for compression and shear loads
- 1985
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Ingår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. - : Elsevier BV. - 0148-9062 .- 1879-2073. ; 22:4, s. 197-213
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Tidskriftsartikel (refereegranskat)abstract
- A series of compression and shear tests were conducted at large scale on joint surfaces in granite and slate specimens, with special equipment being used to isolate the deformations of the joints from those of the rock material. The matrix of compliance components for a rock joint is discussed in relation to these standard tests and it is shown that one pair of compliance components can be determined from a compression test and a second pair from a shear test. For the compression tests, the test results indicate a pattern of decreasing compliance with load, an increase in compliance with initial aperture, and high levels of recoverability of deformation. In the shear tests, the curves for the relative displacements indicate there are three zones of different behavior, elastic, transition and sliding
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