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Post-peak deformation and failure behaviour of Jinping marble under true triaxial stresses
Abstract The post-peak behaviour of rocks plays an important role in studying the stability of surrounding rocks. A series of true triaxial compression tests in high-low stress states were carried out on 58 Jinping marble specimens. The characteristics of complete stress–strain curves, including the post-peak stage, the corresponding meso- and micro-failure characteristics with scanning electron microscopy (SEM), and the whole progressive failure processes with acoustic emission (AE), were analysed. With either decreasing σ3 or increasing σ2, the shapes of the post-peak curves change from Class I to Transition and then to Class II. Additionally, the changes have obvious stress boundaries. As σ2 increases at low-constant σ3 or σ3 decreases at constant σ2, the failure mode changes from tensile–shear mixed failure or shear failure to tensile failure, and these changes correspond with the changes in the post-peak curves. Micro-failure of marble changes from intergranular failure at Class I to transgranular failure at Class II. The AE characteristics of the three typical post-peak progressive failure processes are significantly different, matching the brittle failure behaviour from weak to strong. This study enhances the knowledge of in situ failure mechanisms and the stability of deep-buried tunnels and caverns.
Highlights The complete post-peak deformation and failure results for 58 Jinping marble specimens under various true triaxial stresses were obtained σ2 induced a change in the post-peak deformation curve shapes from Class I to Class II, especially at low σ3 σ2 induced multiple parallel fractures, and the failure mode changed from mixed to tensile failure at low σ3 The in-depth study of rock post-peak behaviour is conducted by linking the 3D stress states (σ2, σ3), shapes of the post-peak curves, meso- and micro-failure, and AE characteristics The impact of the post-peak deformation and failure characteristics of marble on engineering failure mechanisms is explored
Post-peak deformation and failure behaviour of Jinping marble under true triaxial stresses
Abstract The post-peak behaviour of rocks plays an important role in studying the stability of surrounding rocks. A series of true triaxial compression tests in high-low stress states were carried out on 58 Jinping marble specimens. The characteristics of complete stress–strain curves, including the post-peak stage, the corresponding meso- and micro-failure characteristics with scanning electron microscopy (SEM), and the whole progressive failure processes with acoustic emission (AE), were analysed. With either decreasing σ3 or increasing σ2, the shapes of the post-peak curves change from Class I to Transition and then to Class II. Additionally, the changes have obvious stress boundaries. As σ2 increases at low-constant σ3 or σ3 decreases at constant σ2, the failure mode changes from tensile–shear mixed failure or shear failure to tensile failure, and these changes correspond with the changes in the post-peak curves. Micro-failure of marble changes from intergranular failure at Class I to transgranular failure at Class II. The AE characteristics of the three typical post-peak progressive failure processes are significantly different, matching the brittle failure behaviour from weak to strong. This study enhances the knowledge of in situ failure mechanisms and the stability of deep-buried tunnels and caverns.
Highlights The complete post-peak deformation and failure results for 58 Jinping marble specimens under various true triaxial stresses were obtained σ2 induced a change in the post-peak deformation curve shapes from Class I to Class II, especially at low σ3 σ2 induced multiple parallel fractures, and the failure mode changed from mixed to tensile failure at low σ3 The in-depth study of rock post-peak behaviour is conducted by linking the 3D stress states (σ2, σ3), shapes of the post-peak curves, meso- and micro-failure, and AE characteristics The impact of the post-peak deformation and failure characteristics of marble on engineering failure mechanisms is explored
Post-peak deformation and failure behaviour of Jinping marble under true triaxial stresses
Zheng, Zhi (author) / Feng, Xia-Ting (author) / Yang, Cheng-Xiang (author) / Zhang, Xi-Wei (author) / Li, Shao-Jun (author) / Qiu, Shi-Li (author)
Engineering Geology ; 265
2019-11-29
Article (Journal)
Electronic Resource
English
Brittle-ductile transition and failure mechanism of Jinping marble under true triaxial compression
| British Library Online Contents | 2018
Brittle-ductile transition and failure mechanism of Jinping marble under true triaxial compression
| British Library Online Contents | 2018