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| 2. |
- Hakami, H., et al.
(författare)
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Shear fracture energy of Stripa granite : Results of controlled triaxial testing
- 1990
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Ingår i: Engineering Fracture Mechanics. - 0013-7944 .- 1873-7315. ; 35:4-5, s. 855-865
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Tidskriftsartikel (refereegranskat)abstract
- We have performed controlled triaxial experiments on Stripa granite in a 'nearly stiff' environment. This means that, before the commencement of loading, an initial confining pressure was 'locked' in the pressurizing chamber of the triaxial vessel. During the axial loading of the sample, the confining pressure was unavoidably increased, opposing largely the 'free' expansion of the sample due to overall microcracking. Further increase in confining pressure beyond the peak load resulted from the dilation of the formed shear fracture, during shear displacement. Under triaxial testing condition a reasonable assumption is that the shear fracture in the specimen is a consequence of pure shear (mode II) state of stress prevailing in the sample, in the vicinity of a 'bandlike' zone, from which the shear fracture propagated. Under this assumption and by the relevant fracture mechanics approach incorporating the 'slip weakening' model, shear fracture energy of Stripa granite was estimated. The results were compared with those estimated through controlled triaxial experiments at constant confining pressure, recently reported by other workers. Also, the influence of the testing method described here on the process of laboratory failure of rock in shear is discussed.
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| 3. |
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| 4. |
- Jing, Lanru, et al.
(författare)
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Numerical modelling of intraplate earthquake by 2-dimensional distinct element method
- 1990
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Ingår i: Gerlands Beitraege zur Geophysik. - 0016-8696. ; 989:5, s. 463-472
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Tidskriftsartikel (refereegranskat)abstract
- computational model for an intraplate earthquake source, comprising of three blocks and two intersection faults, is analysed by using a two-dimensional Distinct Element Method. The Mohr-Coulumb model (M-CM) and Continuously-Yielding model (C-YM) of rock discontinuities are used to simulate the behaviour of the faults. Stick-slip phenomena are obtained for both models. The results support the idea that the nucleation of an intraplate earthquake starts at the intersects of faults
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| 5. |
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| 6. |
- Kulatilake, Pinnaduwa H.S.W., et al.
(författare)
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Analysis of structural homogeneity of rock masses
- 1990
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Ingår i: Engineering Geology. - 0013-7952 .- 1872-6917. ; 29:3, s. 195-211
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Tidskriftsartikel (refereegranskat)abstract
- The statistical tests suggested by Miller (1983) and Mahtab and Yegulalp (1984) to investigate structural homogeneity in rock masses are reviewed. The difficulty in making a decision about statistical homogeneity only through the results of either one of these two tests or through equal-area polar plots, is shown through a case study. New interpretations are suggested for these two tests to use them in assigning relative ranks for the strength of homogeneity of different regions in rock masses. An example is given to illustrate how one can use Miller's method with new interpretations along with equal-area plots in making decisions about statistical homogeneity in rock masses. The example also shows an attempt to incorporate results of Mahtab and Yegulalp's test with new interpretations to the decision-making process
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| 8. |
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| 9. |
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| 10. |
- Savilahti, Tomas, et al.
(författare)
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Shear box testing and modelling of joint bridges
- 1990
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Ingår i: Rock joints. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061911095 ; , s. 295-300
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Konferensbidrag (refereegranskat)
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