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New developments in the Integrated Stress Determination Method and their application to rock stress data at the Aspo HRL, Sweden
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
2006 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, Vol. 43, no 1, 107-126 p.Article in journal (Refereed) Published
Abstract [en]

The Integrated Stress Determination Method (ISDM) is a powerful tool for estimating the regional stress tensor from in-situ measurements of local stress tensors using a wide variety of stress measuring techniques. This study presents new developments of the ISDM: The stress field may be described with up to 12 model parameters; and is applicable to data from CSIR- and CSIRO HI-type of overcoring devices, hydraulic fracturing, hydraulic tests of pre-existing fractures (HTPF), as well as to combined data sets. Furthermore, in combined data sets, the hydraulic fracturing and/or HTPF data may be used to constrain the average elastic parameters, Young's modulus and Poisson's ratio. The new ISDM developments were applied to the extensive and recently re-analysed rock stress data at the Aspo Hard Rock Laboratory. The results reveal a good fit of the re-analysed data. Overall, the re-analysis indicates that the stress field at Aspo HRL is relatively well constrained and consistent with depth. The NE-2 Fracture Zone influences the stresses, and dividing the regional stress field into a NW and a SE stress domain. When the hydraulic fracturing data were used to constrain the average elastic parameters, Young's modulus, E, and Poisson's ratio, v, quite similar results were obtained (E = 50.8 GPa and v = 0.33) compared with results from biaxial tests of overcore samples (E = 61.6 MPa and v = 0.26).

Place, publisher, year, edition, pages
2006. Vol. 43, no 1, 107-126 p.
Keyword [en]
ISDM, state of stress, hydraulic fracturing, overcoring, Aspo HRL
National Category
Mineral and Mine Engineering
URN: urn:nbn:se:kth:diva-47140DOI: 10.1016/j.ijrmms.2005.04.011ISI: 000233798900009ScopusID: 2-s2.0-27944507774OAI: diva2:454673
QC 20111108Available from: 2011-11-08 Created: 2011-11-07 Last updated: 2011-11-08Bibliographically approved

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