Artigo Acesso aberto Revisado por pares

Effects of a weak interlayer zone on the indirect tensile strength and failure characteristics of rock

2023; Springer Science+Business Media; Volume: 82; Issue: 2 Linguagem: Inglês

10.1007/s12665-022-10741-x

ISSN

1866-6299

Autores

Liang Zhang, Hongwen Jing, Hanxiang Liu, Qian Yin, Yaoyao Meng,

Tópico(s)

Tunneling and Rock Mechanics

Resumo

Weak interlayer zones (WIZs) are widespread in rock masses. Due to their relatively poor mechanical properties, they poses a potential threat to the stability of rock masses. Brazilian tests and numerical simulations were conducted to study the effects of WIZ strength (WIZS), WIZ thickness (WIZT), and loading direction of rock samples. The failure strength anisotropy index (FSAI) and sensitivity index were utilized to further analyse the effects of WIZT and WIZS. The results showed that (1) the failure strength decreased linearly with increasing bedding plane-loading angle (θ). (2) The loading direction had a significant effect on the failure pattern of specimens, which can be divided into “ + ”-shaped failure, double “Y”-shaped failure, and WIZ failure. (3) The accumulated acoustic emission (AE) count curves were divided into three types: steady rise, level constant, and slow rise. (4) The numerical simulation results showed that the failure strength increases with the increase in WIZS and decreases with the increase in WIZT. However, WIZS and WIZT showed a weak correlation with failure patterns.

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