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Magnetic, seismic and mechanical properties of porphyritic meta-rhyolites: The effect of microscopic foliation on rock strength and P-wave velocity in drillcores
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2013 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 157, p. 93-102Article in journal (Refereed) Published
Abstract [en]

Seismic velocity and rock strength in drillcores has previously been shown to vary depending on the angle between the measuring direction and the macroscopic foliation plane, but very little research has been performed on samples with a microscopic foliation. In this study, we use the anisotropy of magnetic susceptibility (AMS) to identify a foliation in what has been assumed to be isotropic rhyolites. We then use scatterplots and simple linear regression analysis to identify and quantify the relationships between AMS, diametrical P-wave velocity and point load (PL) strength in the ferromagnetic samples. Our study suggests that the PL strength increases with 56% when the angle between the foliation plane and the measuring direction is increased from 14° (close to the foliation plane) to 65°. Such a high change in rock strength with direction, in rocks with no macroscopic foliation, could have serious implication e.g. in rock mechanical modeling, and AMS can thus be used as a tool predict fracturing

Place, publisher, year, edition, pages
2013. Vol. 157, p. 93-102
National Category
Geophysics
Research subject
Applied Geophysics; Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-15312DOI: 10.1016/j.enggeo.2013.01.008ISI: 000318263100010Scopus ID: 2-s2.0-84875777421Local ID: eced44cf-81d5-4450-a1c5-08fd18302530OAI: oai:DiVA.org:ltu-15312DiVA, id: diva2:988286
Note
Validerad; 2013; 20130205 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Jensen, Mai-Britt MoseElming, Sten-åke

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