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dc.contributor.authorAlejano, L.pt_BR
dc.contributor.authorGonzález, J.pt_BR
dc.contributor.authorMuralha, J.pt_BR
dc.identifier.citationRock Mech Rock Eng (2012) 45:1023–1035pt_BR
dc.description.abstractA relevant parameter for estimating discontinuity shear strength is the basic friction angle, usually derived from different types of tilt tests. However, the tilt tests described in the literature produce varying basic friction angle values. From a large number of different types of tilt tests on different kinds of rocks, it was possible to conclude that the mechanisms of sliding along cylinder generatrixes and planar surfaces are quite different, and that tests based on sliding along generatrixes are not appropriate for determining reliable basic friction angle values for discontinuity planes. Tests on small specimens are also not recommended, for geometry reasons and because ensuring reliable stress conditions is difficult. To quantify the natural variability in tilt testing, large specimens of the same granite were tested. The results revealed coefficients of variation for the basic friction angle in the range of 5–10 %, a variability which is no greater than that found for other rock mechanics parameters. This observation enables to forward some recommendations concerning the appropriate number of tests needed to obtain reliable results.pt_BR
dc.subjectBasic friction anglept_BR
dc.subjectTilt testingpt_BR
dc.subjectVariability assessmentpt_BR
dc.subjectJoint strengthpt_BR
dc.titleComparison of different techniques of tilt testing and basic friction angle assessmentpt_BR
dc.description.volumeVol 45; Nr 6pt_BR
dc.description.magazineRock Mechanics and Rock Engineeringpt_BR
Appears in Collections:DBB/NMMR - Comunicações a congressos e artigos de revista

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