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Behavior of transversely isotropic shale observed in triaxial tests and Brazilian disc tests
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.ijrmms.2020.104435 Sheng-Qi Yang , Peng-Fei Yin , Bin Li , Dian-Sen Yang
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.ijrmms.2020.104435 Sheng-Qi Yang , Peng-Fei Yin , Bin Li , Dian-Sen Yang
Abstract Shale rock is widely distributed in nature and must be taken into account in some rock engineering applications. In this research, three kinds of experiments, namely the conventional triaxial compression test, reducing confining pressure test, and Brazilian test were conducted on a type of shale rock specimen with a horizontal bedding plane and a vertical bedding plane collected from Lushan city, Jiangxi Province, China to further investigate the bedding effect on the mechanical properties of shale rock. An acoustic emission (AE) monitoring system was used to study the fracture process under the conventional triaxial compression test, whereas a digital image correlation (DIC) system was employed to monitor the deformation of disk faces during the failure process under the Brazilian test. Another key issue addressed in this research is the failure process and mechanism of shale specimens with horizontal and vertical bedding planes under the reducing confining pressure test. The conventional triaxial compression test shows that the bedding plane could easily affect the elasticity modulus and failure pattern, and the failure of the bedding plane can lead to stronger energy release and a higher AE count level. The reducing confining pressure test shows that the dissipated energy magnitude of unloading Path II (reducing confining pressure and increasing axial stress) is much larger than that of unloading Path I (reducing confining pressure and keeping axial strain constant), and that continuous energy input and larger energy dissipation led the specimens under unloading Path II to fail faster than those under unloading Path I. The Brazilian test further revealed that the bedding plane has a significant effect on the tensile strength and failure pattern of shale rock.
更新日期：2020-09-01
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