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A novel method for geometric quality assurance of rock joint replicas in direct shear testing-Part 2:Validation and mechanical replicability

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2209-2223页

作者： J.Larsson F.Johansson d.mas ivars E.Johnson M.Flansbjer N.W.Portal division of Material and Production Department of Chemistry and Applied MechanicsResearch Institutes of Sweden(RISE)Brinellgatan 4Borås50115Sweden division of Soil and Rock Mechanics Department of Civil and Architectural EngineeringRoyal Institute of Technology(KTH)Brinellvägen 23Stockholm10044Sweden Swedish Nuclear Fuel and Waste Management Co.(SKB) SolnaSweden

Each rock joint is unique by nature which means that utilization of replicas in direct shear tests is required in experimental parameter ***,a method to acquire knowledge about the ability of the replicas to imitate the shear mechanical behavior of the rock joint and their dispersion in direct shear testing is *** this study,a novel method is presented for geometric quality assurance of *** aim is to facilitate generation of high-quality direct shear testing data as a prerequisite for reliable subsequent analyses of the *** Part 1 of this study,two quality assurance parameters,smf and V_(Hp100),are derived and their usefulness for evaluation of geometric deviations,*** reproducibility,is *** Part 2,the parameters are validated by showing a correlation between the parameters and the shear mechanical behavior,which qualifies the parameters for usage in the quality assurance *** results from direct shear tests presenting comparisons between replicas and the rock joint show that replicas fulfilling proposed threshold values of σ_(mf)d|V_(Hp100)|dispersion and imitate the shear mechanical behavior of the rock joint in all aspects apart from having a slightly lower peak shear *** wear in these replicas,which have similar morphology as the rock joint,is in the same areas as in the rock *** wear is slightly larger in the rock joint and therefore the discrepancy in peak shear strength derives from differences in material properties,possibly from differences in *** is shown by application of the suggested method that the quality assured replicas manufactured following the process employed in this study phenomenologically capture the shear strength characteristics,which makes them useful in parameter studies.

关键词： Three-dimensional(3d)scanning Contact area measurements direct shear testing Geometric quality assurance Mechanical replicability Replicas Rock joint

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Particle flow code simulation of intact and fissured granitic rock samples

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 960-974页

作者： Uxía Castro-Filgueira Leandro R.Alejano diego mas ivars department of Natural Resources and Environmental Engineering University of VigoVigoSpain department of Geology and Geological Engineering Colorado School of MinesGoldenCOUSA Swedish Nuclear Fuel and Waste Management Company(SKB) StockholmSweden division of Soil and Rock Mechanics Royal Institute of Technology(KTH)StockholmSweden

This study presents a calibration process of three-dimensional particle flow code(PFC3d)simulation of intact and fissured granite ***,laboratory stressestrain response from triaxial testing of intact and fissured granite samples is ***,PFC3d is introduced,with focus on the bonded particle models(BPM).After that,we present previous studies where intact rock is simulated by means of flatjoint approaches,and how improved accuracy was gained with the help of parametric ***,models of the pre-fissured rock specimens were generated,including modeled fissures in the form of“smooth joint”type ***,triaxial testing simulations of 1 t 2 and 2 t 3 jointed rock specimens were *** show that both elastic behavior and the peak strength levels are closely matched,without any additional fine tuning of micro-mechanical *** the postfailure behavior,models reproduce the trends of decreasing dilation with increasing confinement and ***,the dilation values simulated are larger than those observed in *** is attributed to the difficulty in modeling some phenomena of fissured rock behaviors,such as rock piece corner crushing with dust production and interactions between newly formed shear bands or axial splitting cracks with pre-existing joints.

关键词： Numerical methods Artificially fissured samples Rock mass behavior Particle flow code Parallel bond Flat-joint Smooth-joint

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