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Rock Failure Characteristics Evaluated Under True Triaxial Loading from Micro-mechanical Viewpoint
Abstract Geomaterials are widely known to exhibit loading-path-dependent mechanical behavior. The path dependence becomes more evident in triaxial loading conditions where the three principal stresses can have different histories, thereby creating a rich combination of complicated loading regimes. True triaxial loading which allows for independently varying the principal stresses, therefore, is the ideal experiment to investigate this behavior. In this work, we have used the Granular Micromechanics Approach (GMA) to derive the macroscopic behavior of rock-like granular materials by studying the behavior of inter-granular contacts in all directions. The work is motivated by the recent true triaxial experiments on sandstones showing the effect of Lode angle and mean stress on the stress state at failure. In this paper, we have analyzed the experimental loading condition as well as an additional loading scenario in which both the Lode angle and the mean stress are kept constant. Our micro-mechanical analysis shows that these two loading paths result in different failure envelopes. Accordingly, a priori assumptions of the failure criteria that are based upon stress states, and only weakly on loading paths, are shown to lead to misleading results. The GMA can be used as a theoretical-numerical predictive alternative to experimental measurements for evaluating the load-path dependency of failure. Further, GMA is shown to be able to asses failure stress state as well as the failure mode based on localization analysis.
Rock Failure Characteristics Evaluated Under True Triaxial Loading from Micro-mechanical Viewpoint
Abstract Geomaterials are widely known to exhibit loading-path-dependent mechanical behavior. The path dependence becomes more evident in triaxial loading conditions where the three principal stresses can have different histories, thereby creating a rich combination of complicated loading regimes. True triaxial loading which allows for independently varying the principal stresses, therefore, is the ideal experiment to investigate this behavior. In this work, we have used the Granular Micromechanics Approach (GMA) to derive the macroscopic behavior of rock-like granular materials by studying the behavior of inter-granular contacts in all directions. The work is motivated by the recent true triaxial experiments on sandstones showing the effect of Lode angle and mean stress on the stress state at failure. In this paper, we have analyzed the experimental loading condition as well as an additional loading scenario in which both the Lode angle and the mean stress are kept constant. Our micro-mechanical analysis shows that these two loading paths result in different failure envelopes. Accordingly, a priori assumptions of the failure criteria that are based upon stress states, and only weakly on loading paths, are shown to lead to misleading results. The GMA can be used as a theoretical-numerical predictive alternative to experimental measurements for evaluating the load-path dependency of failure. Further, GMA is shown to be able to asses failure stress state as well as the failure mode based on localization analysis.
Rock Failure Characteristics Evaluated Under True Triaxial Loading from Micro-mechanical Viewpoint
Rock Mech Rock Eng
Poorsolhjouy, Payam (author) / Mews, Kim Sarah (author) / Misra, Anil (author)
2025-02-17
Article (Journal)
Electronic Resource
English
Failure of Castlegate Sandstone Under True Triaxial Loading
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Post failure behaviour of a rock mass under the influence of triaxial and true triaxial confinement
| British Library Online Contents | 2006
Post failure behaviour of a rock mass under the influence of triaxial and true triaxial confinement
| Online Contents | 2006