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Assessment of Direct Tensile Strength Tests in Rock Through a Multi-laboratory Benchmark Experiment
Universidade de Vigo, Spain; KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0003-0883-7211
Laboratorio de Geotecnia, Spain.
Graz University of Technology, Austria.
TU Bergakademie Freiberg, Germany.
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2024 (English)In: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

This study aims to experimentally assess repeatability and reproducibility of direct tensile strength (DTS) tests with deformability measurements on two types of rocks: Blanco Mera granite (Spain) and Cotta sandstone (Germany). The tests were conducted in four rock mechanics laboratories located in different countries (Canada, Germany, Spain and Sweden). A total of 51 tests were performed on cylindrical specimens of the two rocks, using different test equipment and measuring devices. Mean and standard deviation DTS values were determined in the four laboratories for the granite (5.70 ± 0.32, 6.06 ± 0.11, 3.84 ± 0.50 and 6.76 ± 0.10 MPa) and for the sandstone (1.88 ± 0.07, 1.96 ± 0.06, 1.15 ± 0.32 and 1.74 ± 0.19 MPa), together with Young’s moduli and Poisson’s ratios in tension, being statistically analysed to evaluate the variability and compare the main results obtained from the participating laboratories. The findings indicate that the DTS test with deformability measurements on cylindrical rock specimens is operationally feasible. However, certain shortcomings have been identified during the course of the experiments with the existing methodologies, such as the one suggested by the ISRM for DTS tests. The results have also shown to be sensitive to appropriate test and strain measurement configurations. The objective of this study was to shed light on these issues and provide new insights for potential future improvements of the existing testing methods.

Place, publisher, year, edition, pages
Springer Nature, 2024.
Keywords [en]
Direct tensile strength, Deformability, Reproducibility, Repeatability, Benchmark, Methodology
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-72001DOI: 10.1007/s00603-023-03751-zOAI: oai:DiVA.org:ri-72001DiVA, id: diva2:1839455
Available from: 2024-02-20 Created: 2024-02-20 Last updated: 2024-02-22Bibliographically approved

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Jacobsson, Lars

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