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Forsmark – Laboratory tests in borehole KFM24 : Thermal properties by TPS method and indirect tensile strength tests with strain measurements of intact rock
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0003-4526-4061
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0001-8670-062x
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0001-6939-6099
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2021 (English)Report (Other academic)
Abstract [en]

The density, thermal and mechanical properties were determined on water-saturated specimens from borehole KFM24 in the Forsmark site investigation area. The rock type was granite to granodiorite (101057). All specimens had a more or less foliated rock structure. The cores were sampled from depths ranging between 65–526 m. The specimens were water-saturated using tap water and all subsequent measurements were conducted at this moisture condition. The density was determined on 25 specimens followed by measuring the thermal properties of 9 pairs of specimens. The thermal conductivity and diffusivity were measured and the volumetric heat capacity was calculated from the thermal conductivity and diffusivity. The testing ended with 21 indirect tensile tests yielding the indirect tensile strength. The strain was measured using strain gauges during the indirect tensile tests. The density at a water-saturated condition was 2648–2694 kg/m3 . Thermal properties were measured at ambient temperature (23°C) and under water-saturated conditions. The determination of the thermal properties is based on a direct measurement method, the so called “Transient Plane Source Method” (TPS). Thermal conductivity and thermal diffusivity at 23°C were in the range of 3.1–3.8 W/(m, K) and 1.8–2.0 mm2 /s, respectively. The volumetric heat capacity, which was calculated from the thermal conductivity and diffusivity, ranged between 1.8 and 2.3 MJ/(m3 , K). The indirect tensile tests were conducted with the diametrical compression across the foliation planes. The indirect tensile strength was in the range 9.7–16.5 MPa

Place, publisher, year, edition, pages
2021. , p. 74
Series
Report SWEDISH NUCLEAR FUEL AND WASTE MANAGEMENT CO
Keywords [en]
Thermal properties, Thermal conductivity, Thermal diffusivity, Heat capacity, Transient plane source method, Elasticity parameters, Indirect tensile strength, Tension test, Strain measurement, AP SFK-21-006
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:ri:diva-59303OAI: oai:DiVA.org:ri-59303DiVA, id: diva2:1663533
Available from: 2022-06-02 Created: 2022-06-02 Last updated: 2024-05-22Bibliographically approved

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Jacobsson, LarsSjöström, JohanSokoti, HasanLindström, Camilla

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