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Determination of the stress field in a mountainous granite rock mass
Portuguese Lab Civil Engn LNEC, Lisbon, Portugal..
CNRS, IPG S, Strasbourg, France..
Portuguese Lab Civil Engn LNEC, Lisbon, Portugal..
Portuguese Lab Civil Engn LNEC, Lisbon, Portugal..
2014 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 72, 37-48 p.Article in journal (Refereed) Published
Abstract [en]

The design of an underground hydroelectric power scheme in northern Portugal has required the characterisation of the local stress field. Nineteen hydraulic tests have been concluded in two, 500 m deep, vertical boreholes. In addition twelve overcoring tests together with twelve fiat jack tests have been performed from an existing adit located some 1.7 km away horn the location of the hydraulic tests. Results have been integrated into a stress model that takes into account both topography and tectonics effects. Most of the data are consistent with a linearly elastic, gravity loaded model, provided a very soft geomaterial is considered. This implies that the stress field in this granite rock mass is controlled by gravity alone and shear stress relaxation along faults and fractures but is unaffected by present-day tectonics. (C) 2014 Elsevier Ltd. All rights reserved,

Place, publisher, year, edition, pages
2014. Vol. 72, 37-48 p.
Keyword [en]
In situ stress measurements, Regional stress field, Elastic rock mass, Shear stress relaxation, Natural fracture network
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-306316DOI: 10.1016/j.ijrmms.2014.07.017ISI: 000345583900005OAI: oai:DiVA.org:uu-306316DiVA: diva2:1049504
Available from: 2016-11-24 Created: 2016-10-27 Last updated: 2016-11-24Bibliographically approved

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Figueiredo, B.
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