Dynamic mechanical response and failure behaviour of single-flawed rocks under combined compression-shear loading

IF 4.7 2区 工程技术 Q1 MECHANICS
Zhi Cai , Feng Dai , Zelin Yan , Yi Liu , Biao Zhang , Mingdong Wei
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引用次数: 0

Abstract

In deep underground engineering projects, flawed rocks are often subjected to dynamic compression-shear loading owing to the arbitrary distribution of structural planes in rock mass. Understanding the dynamic mechanical response of flawed rocks under compression-shear loading is of great significance for rock engineering construction. In this study, the mechanical response and failure behaviors of flawed rock specimens subjected to dynamic compression-shear loading are studied by introducing an oblique cubic flawed specimen into the split Hopkinson pressure bar (SHPB) tests. Firstly, the stress distribution of the oblique flawed specimen is analyzed by using the finite element method. Numerical results show that the stress concentration zones are distributed along the short diagonal of oblique rock specimens, which validates the oblique specimen is an effective method to investigate the dynamic compression-shear failure behaviors of flawed rocks. Then, dynamic impact tests are conducted on oblique flawed rocks with different configurations. The experimental results indicate that the oblique angle, the flaw inclination angle, and the strain rate significantly affect the dynamic strength and deformation characteristics of the rock. Utilizing high-speed digital image correlation (DIC), the progressive cracking behavior and failure modes of flawed rocks under dynamic compression-shear loading are analyzed. The mixed compression-shear cracking dominates the failure of flawed rock specimens. In addition, the energy dissipation density and fragmentation degree also exhibit a strong strain rate dependency, and they are positively correlated with the dynamic strength of the flawed rocks.
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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