Graphical evaluation of 3D rock surface roughness: Its demonstration through direct shear strength tests on bátaapáti granites and Mont Terri Opalinus Claystones

I. Buocz, N. Rozgonyi-Boissinot, A. Török

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

Abstract

The shear strength of rocks along discontinuities is one of the key parameters for the determination of rock slope stability, the stability of rocks during underground space development and tunneling. Its value is influenced by numerous factors including surface roughness, which is one of the most widely investigated discontinuity property. The present paper introduces a simple graphical methodology for the classification of the surface roughness of rocks, based on the example of two different rock types, Bátaapáti Granites (Hungary), and Mont Terri Opalinus Claystones (Switzerland). The 3D surface of 24 rock samples was digitized using a photogrammetric surface detection method with the help of the ShapeMetrix3D software. The plane of each rock surface was defined by fitting a linear regression plane to the surface data. The distance between the data points of the surface roughness model and the regression plane was measured, and cumulative frequency diagrams of the measured distance values were constructed. This procedure allowed to define three surface roughness categories. The methodology proposed represents a promising new approach to surface roughness quantification, which could improve shear strength estimation.

Original languageEnglish
Title of host publicationGeomechanics and Geodynamics of Rock Masses
EditorsVladimir Litvinenko
PublisherCRC Press/Balkema
Pages219-226
Number of pages8
ISBN (Print)9781138616455
Publication statusPublished - Jan 1 2018
EventInternational European Rock Mechanics Symposium, EUROCK 2018 - Saint Petersburg, Russian Federation
Duration: May 22 2018May 26 2018

Publication series

NameGeomechanics and Geodynamics of Rock Masses
Volume1

Conference

ConferenceInternational European Rock Mechanics Symposium, EUROCK 2018
CountryRussian Federation
CitySaint Petersburg
Period5/22/185/26/18

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ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Buocz, I., Rozgonyi-Boissinot, N., & Török, A. (2018). Graphical evaluation of 3D rock surface roughness: Its demonstration through direct shear strength tests on bátaapáti granites and Mont Terri Opalinus Claystones. In V. Litvinenko (Ed.), Geomechanics and Geodynamics of Rock Masses (pp. 219-226). (Geomechanics and Geodynamics of Rock Masses; Vol. 1). CRC Press/Balkema.