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Analysis of size effects on the geomechanical parameters of intact granite samples under unconfined conditions

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Abstract

A total of 28 uniaxial compressive strength tests were performed on cylindrical Blanco Mera granite samples with diameters ranging between 14 and 100 mm, with results indicating that this granite undergoes a significant reverse size effect: the UCS increases as sample diameter increases up to 54 mm, but thereafter decreases. It was also found that the results tend to be more scattered for smaller sample diameters. We also found an apparent correlation between Young’s modulus and sample diameter. It was not possible to draw any clear conclusions regarding the variability in Poisson’s ratio with sample size. With respect to crack initiation and crack damage stresses, the behaviour of the tested samples also indicates a reverse effect. This research would suggest that the traditionally assumed decrease in strength as sample size increases does not hold for granite samples with diameters below 54 mm.

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Source: Arzúa and Alejano [3]

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Acknowledgements

The authors thank the Spanish Ministry of the Economy and Competitiveness for funding this research, awarded under Contract Reference No. BIA2014-53368P, partially financed by means of ERDF funds from the EU. Ailish M. J. Maher is acknowledged for language editing of a version of this manuscript.

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Authors and Affiliations

  1. Natural Resources and Environmental Engineering Department, University of Vigo, Vigo, Spain

    J. Quiñones, L. R. Alejano & F. García-Bastante

  2. Department of Metallurgical and Mining Engineering, Universidad Católica del Norte, Antofagasta, Chile

    J. Arzúa

  3. Swedish Nuclear Fuel and Waste Management Co, SKB, Stockholm, Sweden

    D. Mas Ivars

  4. Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, USA

    G. Walton

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  1. J. Quiñones
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  5. D. Mas Ivars
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  6. G. Walton
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Correspondence to L. R. Alejano.

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Quiñones, J., Arzúa, J., Alejano, L.R. et al. Analysis of size effects on the geomechanical parameters of intact granite samples under unconfined conditions. Acta Geotech. 12, 1229–1242 (2017). https://doi.org/10.1007/s11440-017-0531-7

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