Experimental study of size effects of rock on UCS and point load tests

H. Masoumi, K. J. Douglas, S. Saydam, P. Hagan

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

9 Citations (Scopus)


A number of studies have investigated the size effect of intact rock mostly focusing on the uniaxial compression test. The most widely used being that by Hoek and Brown [1]. The authors have conducted a suite of uniaxial compressive and point load tests on some igneous and metamorphic rocks to assess the effect of size on the results. The results illustrate that the trend of the Hoek and Brown [1] size relationship is not applicable to the tested rock samples particularly at small diameters. It was also found that the size effect relationship differed for the point load and unconfined compressive tests. The authors present the results and provide a discussion as to the potential reasons for the varying size effects at different stress paths. The results have implications for designers when considering potential testing programs and estimations of strength parameters for their designs in rock.

Original languageEnglish
Title of host publication46th US Rock Mechanics / Geomechanics Symposium 2012
PublisherAmerican Rock Mechanics Association (ARMA)
Number of pages8
ISBN (Print)9781622765140
Publication statusPublished - 1 Jan 2012
Externally publishedYes
EventUS Rock Mechanics / Geomechanics Symposium 2012 - Chicago, United States of America
Duration: 24 Jun 201227 Jun 2012
Conference number: 46th

Publication series

Name46th US Rock Mechanics / Geomechanics Symposium 2012


ConferenceUS Rock Mechanics / Geomechanics Symposium 2012
Country/TerritoryUnited States of America
OtherThe American Rock Mechanics Association invites you to its 46th Mechanics/ GeoMechanics Symposium to be held in Chicago, Illinois, USA on 24-27 june 2012

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