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Forsmark and Oskarshamn site investigtion Borholes Inter-laboratory comparison of rock mechanics testing results. SKB P-05-239.
Brandteknik, material (BRm).
2006 (English)Report (Refereed)
Abstract [en]

Abstract Laboratory testing of the mechanical and thermal properties of rock is a part of the activities Performed during the current SKB site investigations. The laboratory testing is being conducted at SP, (the Swedish National Testing Institute) and at other laboratories. The objective of this investigation was to evaluate the comparative accuracy and precision of the test methods for indirect tensile strength, uni- and triaxial strength, shear strength, thermal expansion and heat capacity as conducted at the different laboratories. The core samples were obtained from borehole KFM01A at Forsmark and KSH01A at Oskarshamn. A significant difference in the results from the different laboratories was detected for Poisson’s ratio, peak shear stress and thermal expansion. However, no significant difference between the laboratories’ results could be detected for thermal capacity, thermal diffusivity, thermal conductivity and compressive strength as determined in the uniaxial test. For Young’s modulus, residual shear stress and indirect tensile strength the differences are questionable. Investigations of causes for differences in the results are not part of the current commission. Although interviews with responsible personnel at the SP laboratories indicated that the reasons could be load application (interlayer) in the indirect tensile strength test, shear area and compensation for change of area during the shear test, stress level for calculation of the Poisson’s ratio and conversion of readings for measuring thermal expansion. Before any further investigation is performed, these differences between the laboratories must be examined further and eliminated. For future inter-laboratory comparisons of this nature, we recommend that the technically responsible at the laboratories go over the methods and the procedures (sample preparation, testing and data reduction) together, to identify and take care of the differences between the different laboratories. The thermal properties are measured by the same principle on equipment from the same supplier. It could therefore be of interest to compare the results with the results that are obtained by another measurement principle.

Place, publisher, year, edition, pages
2006. , 44 p.
Series
Svensk Kärnbränslehantering AB; KFM01 and KSH01A., ISSN 1651-4416
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-5665Local ID: 7487OAI: oai:DiVA.org:ri-5665DiVA: diva2:963490
Available from: 2016-09-08 Created: 2016-09-08Bibliographically approved

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