A portable tilting table for on-site tests of the friction angles of discontinuities in rock masses

  • Hu Xian-Qin
  • D. M. Cruden


A portable tilting table can determine the friction angles of smooth surfaces of discontinuities for the assessment of rock slope stability. The lower bound of tests on sandstones is close to the upper bound of results from surfaces lapped with #80 grit, which give basic friction angles. Siltstones and shales can also be tested at the site when specimens may not survive transportation to the laboratory.


Sandstone Shale Siltstone Friction Angle Rock Slope 

Une table inclinable et portative pour la détermination sur le terrain des angles de frottement des discontinuités dans les massifs rocheux


On peut déterminer les angles de frottements des discontinuités lisses en utilisant une table portative qui pivote. Les résultats permettent l'évaluation de la stabilité des massifs rocheux qui contiennent ces discontinuités. La limite inférieure des essais sur des grès approche la limite supérieure de l'angle de frottement fondamental. Les échantillons fragiles de schistes ne résistent pas à leur transport au laboratoire; mais on peut évaluer ces roches sur le terrain.


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Copyright information

© International Assocaition of Engineering Geology 1992

Authors and Affiliations

  • Hu Xian-Qin
    • 1
  • D. M. Cruden
    • 2
  1. 1.Department of GeologyUniversity of Alberta EdmontonAlbertaCanada
  2. 2.Department of Civil engineeringUniversity of Alberta EdmontonAlbertaCanada

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