期刊
MEASUREMENT
卷 191, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2022.110794
关键词
Cavity-embedded rock; Stress interaction mechanism; Failure evolution; Discrete element method; Digital image correlation measurement
资金
- National Natural Science Foundation for Young Scientists of China [52104111]
- National Natural Science Foundation of China [41772313]
- Hunan Science and Technology Planning Project [2019RS3001]
- Natural Science Foundation of Hunan [2021JJ30819]
This study investigates the mechanical properties and fracture behavior of rock containing multiple cavities. Experimental and numerical methods are used to analyze the stress evolution and failure coalescence patterns influenced by cavity layout.
To study the mechanical properties and fracture behaviour of rock containing multiple cavities, uniaxial compression experiments were carried out on marble specimens with three rectangular cavities of different layouts. The fracturing behaviour was revealed by digital image correlation (DIC) measurement. Then, discrete element method (DEM) numerical simulations were performed and the stress evolution was analysed to reveal the influence of cavity layout on fracture behaviour and coalescence patterns between them. Results showed that stress evolution and failure coalescence pattern between two cavities can be directly or indirectly influenced by the third cavity. The compressive stress concentrated around the sidewalls of a cavity may suppress the propagation of tensile cracks from other cavities. Combining laboratory and numerical results shows that during the failure evolution, firstly comes the internal coalescence of cavities before instability point, then follows failure from the three-cavity system boundary to the specimen borders resulting in the whole instability.
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