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• W3212117617 endingPage "104535" @default.
• W3212117617 startingPage "104535" @default.
• W3212117617 abstract "The failure mechanism and failure mode of anisotropic rock masses are very different from those of isotropic rock masses. For unsupported tunnels, the failure modes of anisotropic rock masses can be summarized as composite failure, V-shaped notch failure and spalling of bedding planes. Different failure modes are controlled by the mechanical parameters of the rock masses, the environmental occurrences and the excavation conditions. The combined finite-discrete element method (FDEM) was employed to investigate the failure mechanism and failure process of layered rock masses and the influence of different factors on the failure mode. The study results indicate that (1) composite failure is the basic failure mode of the layered rock masses and that it is caused by the combined action of shear-slip fractures F1 parallel to the bedding plane, tensile fractures F2 perpendicular to the bedding plane, and conjugate shear fractures F3; the rotation movement of slab-like rock fragments induced by fractures F1 and F3 into the tunnel causes significant deformation of the surrounding rock masses; (2) on the basis of composite failure, when fractures F1 disappear and fractures F2 obliquely intersect with the bedding plane, V-shaped notch failure occurs; furthermore, spalling of the bedding plane occurs when the propagation of fractures F3 is blocked at the bedding plane; and (3) with increasing rock mass strength, lateral pressure coefficient of in situ stress and layer thickness, or decreasing tunnel span, the surrounding rock masses change from composite failure to V-shaped notch failure and then to spalling of the bedding plane. However, the effect of the elastic modulus on the failure mode of anisotropic rock masses is weak, and the influence of the dip angle of the rock layer on the failure mode is complicated." @default.
• W3212117617 created "2021-11-22" @default.
• W3212117617 creator A5002836569 @default.
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• W3212117617 creator A5088593992 @default.
• W3212117617 date "2022-02-01" @default.
• W3212117617 modified "2023-10-16" @default.
• W3212117617 title "FDEM numerical modeling of failure mechanisms of anisotropic rock masses around deep tunnels" @default.
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• W3212117617 doi "https://doi.org/10.1016/j.compgeo.2021.104535" @default.
• W3212117617 hasPublicationYear "2022" @default.
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