1. Comparative experimental investigation on true triaxial double-sided fast unloading rockburst and biaxial compression under high stress
- Author
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Li, Jieyu, He, Manchao, Liu, Dongqiao, Elmo, Davide, and Zhang, Jiamiao
- Subjects
Rock mechanics -- Models ,Acoustic emission testing -- Usage ,Excavation -- Environmental aspects ,Earth sciences - Abstract
To explore the effect of rapid excavation unloading under high pressure on delayed rockburst, a true triaxial double-sided rapid unloading rockburst experiment and a biaxial compression failure experiment without unloading were carried out. The results show that the rapid unloading of excavation before the occurrence of rockburst will cause unloading damage, and the axial strain, acoustic emission (AE) count, and AE energy will suddenly increase at the unloading point. The AE source shows that the rapid unloading produces many tensile cracks, mainly distributed near the free surface. The axial peak stress of the rockburst and the stored strain energy before failure are higher than those of biaxial compression, so the ejection velocity of free surface fragments is also higher at failure. Key words: rockburst experiment, delayed rockburst, fast unloading, energy storage, acoustic emission (AE), AE source, Introduction Hydropower engineering construction, mining of mineral resources, and geological disposal of nuclear waste involve deep rock mass excavation. A rockburst is a sudden failure mechanical phenomenon during the excavation [...]
- Published
- 2023
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