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  • 1
    Electronic Resource
    Electronic Resource
    Effects of temperature and sliding rate on frictional strength of granite (1986)
    Springer
    Pure and applied geophysics 124 (1986), S. 445-469 
    Details
    ISSN: 1420-9136
    Keywords: Shear strength ; temperature ; deformation rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Layers of artificial granite gouge have been deformed on saw-cut granite surfaces inclined 30° to the sample axes. Samples were deformed at a constant confining pressure of 250 MPa and temperatures of 22 to 845°C. The velocity dependence of the steady-state coefficient of friction (μss) was determined by comparing sliding strengths at different sliding rates. The results of these measurements are consistent with those reported bySolberg andByerlee (1984) at room temperature andStesky (1975) between 300 and 400°C. Stesky found that the slip-rate dependence of (μss) increased above 400°C. In the present study, however, the velocity dependence of (μss) was nearly independent of temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877211
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Shear and tension hydraulic fractures in low permeability rocks (1977)
    Springer
    Pure and applied geophysics 115 (1977), S. 191-198 
    Details
    ISSN: 1420-9136
    Keywords: Stress hydrofracture ; Hydrofracture technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Laboratory hydrofracture experiments were performed on triaxially stressed specimens of oil shale and low-permeability granite. The results show that either shear or tension fractures could develop depending on the level of differentials stress, even in specimens containing preexisting fractures. With 1 kb of confining pressure and differential stress greater than 2kb, hydraulic fluid diffusion into the specimens reduced the effective confining pressure until failure occurred by shear fracture. Below 2kb of differential stress, tension fractures occurred. These results suggest that hydraulic fracturing in regions of significant tectonic stress may produce shear rather than tension fractures. In this casein situ stress determinations based on presumed tension fractures would lead to erroneous results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01637103
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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