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Measurement-related uncertainties in overcoring data at the Aspo HRL, Sweden. Part 2: Biaxial tests of CSIRO HI overcore samples
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Teknisk geologi och geofysik.
2006 (engelsk)Inngår i: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 43, nr 1, s. 127-138Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper is the second dealing with measurement-related uncertainties of overcoring data undertaken at the Aspo Hard Rock Laboratory and focuses on the biaxial test data from CSIRO HI overcore samples. The first paper dealt with measurement-related uncertainties in connection with the overcoring phase [1]. The uncertainties identified in connection to biaxial tests of CSIRO HI overcore samples include too large applied pressures and poor sampling frequency. At the Aspo HRL, the results yield that most overcore samples fractured during biaxial testing, meaning that a significant part, 56%, of available strain gauge combinations were removed from calculations of the elastic parameters. Remaining strain gauge combinations indicate average values of 62 +/- 5 GPa for Young's modulus and 0.25 +/- 0.01 for Poisson's ratio, which are considerably lower than previously published values [2-5], and are in good agreement with results from biaxial tests on Borre Probe overcore samples [6-10]. The stress calculations were obtained from re-analyzed elastic parameters and strains, and show primarily a reduction in stress magnitudes. Overall, the stress field obtained with different stress measurement methods and its variation with depth is now quite well resolved. The overcoring data suggest that the principal stresses are inclined with a vertical component dipping about 65 degrees from the horizontal over the investigated rock volume (140-420 m depth). This is interpreted as a result of influence from the sub-vertical NE-2 Fracture Zone that divides the stress data into two stress domains [11], although it may also be an artefact because the sigma(2)- and sigma(3)-magnitudes are of the same order of magnitude.

sted, utgiver, år, opplag, sider
2006. Vol. 43, nr 1, s. 127-138
Emneord [en]
overcoring, biaxial test, CSIRO HI, Aspo HRL
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-37353DOI: 10.1016/j.ijrmms.2005.05.012ISI: 000233798900010Scopus ID: 2-s2.0-27944445451OAI: oai:DiVA.org:kth-37353DiVA, id: diva2:433421
Tilgjengelig fra: 2011-08-10 Laget: 2011-08-10 Sist oppdatert: 2017-12-08bibliografisk kontrollert

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