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Validity of continuous-failure-state unloading triaxial tests as a means to estimate the residual strength of rocks

Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 717-726页

作者： Gabriel Walton Steven Gaines Leandro R.Alejano Department of Geology and Engineering Geology Colorado School of MinesGoldenCO80401USA Natural Resources Canada CanmetMININGOttawaOntarioK1A 1M1Canada Department of Natural Resources and Environmental Engineering Universidad de VigoVigo36310Spain

The residual strength of rocks and rock masses is an important parameter to be constrained for analysis and design purposes in many rock engineering applications.A residual strength envelope in principal stress space is typically developed using residual strength data obtained from compression tests on many different specimens of the same rock *** this study,we examined the potential for use of the continuous-failure-state testing concept as a means to constrain the residual strength envelope using a limited number of ***,cylindrical specimens of three rock types(granodiorite,diabase,and Stanstead granite)were unloaded at the residual state such that a full residual strength envelope for each individual specimen was *** a residual strength model that introduces a single new strength parameter(the residual strength index,or RSI),the results of the continuous-failurestate unloading tests were compared to conventionally obtained residual strength ***,the continuous-failure-state residual strength data were found to be consistent with the conventional residual strength ***,it was identified that the primary factor limiting an accurate characterization of the residual strength for a given rock type is not the amount of data for a given specimen,but the variety of specimens available to characterize the inherent variability of the rock unit of ***,the use of continuous-failure-state testing for estimation of the residual strength of a rock unit is only recommended when the number of specimens available for testing is very limited(i.e.<5).

关键词： Residual strength continuous-failure-state testing Compression testing Brittle rock mechanics

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