Direct shear strength test: Analysis of the test influencing parameters

Ildikó Buocz, Nikoletta Rozgonyi-Boissinot, A. Török

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

Abstract

The physical properties of rocks are important input parameters for the modelling and analysis of underground structures. Various test methods are known and are standardised to determine most of the data e.g. uniaxial compression strength or tensile strength. However because of the complexity of the test influencing parameters, such as surface roughness, normal stress, presence of joint infill material, dilatancy⋯ etc, for the analytical prediction of shear strength along discontinuities, no standards are available. The goal of the research is to investigate the most important shear strength influencing parameters through experiments, and to create a mathematical approach, in order to be able to determine a more exact value for the shear strength of rocks along discontinuities. The aim of this paper is to give a description of the most important shear strength influencing parameters and to point out their importance through a series of direct shear strength tests, carried out on granite rocks under constant normal load conditions. The values of the surface roughness were determined from 2D profiles that were taken from the 3D images of the surfaces. The results showed that with increasing surface roughness, the shear strength of the joint raises. The same applies to increasing normal stress. On the other hand the presence of the calcite infill material decreased the resistance of the joint.

Original languageEnglish
Title of host publicationProceedings of the 9th fib International PhD Symposium in Civil Engineering
PublisherKarlsruher Institut fur Technologie (KIT)
Pages543-548
Number of pages6
ISBN (Electronic)9783866448582
Publication statusPublished - 2012
Event9th fib International PhD Symposium in Civil Engineering - Karlsruhe, Germany
Duration: Jul 22 2012Jul 25 2012

Other

Other9th fib International PhD Symposium in Civil Engineering
CountryGermany
CityKarlsruhe
Period7/22/127/25/12

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ASJC Scopus subject areas

  • Architecture
  • Building and Construction
  • Civil and Structural Engineering

Cite this

Buocz, I., Rozgonyi-Boissinot, N., & Török, A. (2012). Direct shear strength test: Analysis of the test influencing parameters. In Proceedings of the 9th fib International PhD Symposium in Civil Engineering (pp. 543-548). Karlsruher Institut fur Technologie (KIT).