Abstract
The technique of air-deck charge has been applied in open-pit blasting for a long time. However, the effects of axial air deck in borehole on blast-induced ground vibrations have not been well investigated. In this study, the influences of axial air deck on blast-induced peak particle velocities (PPVs) are investigated based on field tests and numerical simulations. Five blasting tests with the ratios of top axial air deck (i.e., defined as the air-deck volume in borehole divided by the borehole volume) of 0/16, 1/16, 2/16, 3/16 and 4/16 are implemented in an open-pit mine. PPVs and their attenuation trends corresponding to different air-deck ratios are analyzed and discussed. The test results show increasing air-deck ratios can decrease near-field ground vibrations to some extent. In addition, numerical models with single borehole are built and validated with blasting test results. The influences of air-deck positions, air-deck ratios and air-deck numbers in single borehole on near-field ground PPVs are investigated with the calibrated numerical models. It is found that near-field ground PPVs induced by the top air-deck charge are lower than those induced by the bottom and middle air-deck charges when the air-deck ratio is the same. Meanwhile, the variation of air-deck ratios located at the top of borehole has a greater influence on near-field ground PPVs than that located at the middle and bottom of borehole. With the increase of the number of air-deck layers in one borehole, near-field ground PPVs induced by the top air-deck charge increase, while those induced by the middle and bottom air-deck charges decrease.
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Acknowledgements
The authors acknowledge the financial support by the National Basic Research Program of China (2015CB060200), the National Natural Science Foundation of China (41772313, 51804339), the Key Research and Development Program of Hunan (2016SK2003).
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Cheng, R., Zhou, Z., Chen, W. et al. Effects of Axial Air Deck on Blast-Induced Ground Vibration. Rock Mech Rock Eng 55, 1037–1053 (2022). https://doi.org/10.1007/s00603-021-02676-9
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DOI: https://doi.org/10.1007/s00603-021-02676-9