New developments in the Integrated Stress Determination Method and their application to rock stress data at the Aspo HRL, Sweden
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
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.
ISDM, state of stress, hydraulic fracturing, overcoring, Aspo HRL
Mineral and Mine Engineering
IdentifiersURN: urn:nbn:se:kth:diva-47140DOI: 10.1016/j.ijrmms.2005.04.011ISI: 000233798900009ScopusID: 2-s2.0-27944507774OAI: oai:DiVA.org:kth-47140DiVA: diva2:454673
QC 201111082011-11-082011-11-072011-11-08Bibliographically approved