Unified Size-Effect Law for Intact Rock
Publication: International Journal of Geomechanics
Volume 16, Issue 2
Abstract
A suite of laboratory testing was performed on Gosford sandstone samples having a range of sizes, including point-load and uniaxial compressive tests. A unified size-effect law (USEL), based on the work by Zdenek Bazant, involving fracture energy as well as fractal theories, was introduced. It was shown that USEL correlates well with the ascending and descending uniaxial compressive strength trends obtained from Gosford sandstone as well as five other rock types reported by Brian Hawkins. Fractal characteristics found to be the primary mechanism for ascending strength trends and surface flaws could be considered as a secondary mechanism. The influence of the contact area on the size-effect behavior of point-load results was investigated using a new approach. This approach was novel in the way it incorporated the load contact area. Determination of the point-load strength index using this new approach led to opposite size-effect trends compared with those observed using a conventional point-load strength index. Hence, the utilization of USEL leads to better simulation of the new point-load strength index data.
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© 2015 American Society of Civil Engineers.
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Received: Nov 18, 2014
Accepted: May 5, 2015
Published online: Sep 23, 2015
Discussion open until: Feb 23, 2016
Published in print: Apr 1, 2016
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