Abstract
Pyramid cut blasting is an essential form of inclined hole cut blasting, but the in-situ stress effect of pyramid cut blasting is rarely studied. Based on the research background of pyramid cut blasting in a deep rock mass, the size, volume, and fragment size distribution of the blasting cavity before and after uniaxial compression were analysed by a model test. Otherwise, the damage and effective stress of the pyramid cut blasting were analysed with LS-DYNA numerical simulation. The results show that the damage and fragmentation of pyramid cut blasting are not only affected by blasting stress wave and blasting gas, but also affected by uniaxial compression. Under the influence of uniaxial compression, the blasting stress wave and blasting gas are more likely to damage the rock mass parallel to the uniaxial compression direction near the connecting line of blasting hole, and make the volume of cavity larger and the fragment rate lower. Additionally, uniaxial compression has a prominent influence during the middle and late stages of blasting.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Grant No. 51974316), the National Key R&D Program of China (Grant No. 2021YFB3401500) and the National Key Research and Development Program of China (Grant No. 2016YFC0600903).
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Chen, Sy., Yang, Ly., Yang, Ay. et al. Damage evolution and fragmentation behavior of pyramid cut blasting under uniaxial compression. J. Mt. Sci. 19, 1475–1486 (2022). https://doi.org/10.1007/s11629-021-6809-0
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DOI: https://doi.org/10.1007/s11629-021-6809-0