The term rockburst is defined as a sudden and violent explosion of rock in or around an excavation. Rockbursts have been regarded as the least understood and the most feared mining hazard problem facing mining and underground operations all around the world. The paper studies the mechanism of blasting-induced pillar rockbursts in underground mining by considering rockbursts as a buckling (instability) problem of column structures. The stress wave from blasting is considered as an exponentially decreasing dynamic loading. The effects of static loads and dynamic disturbances are investigated. The perturbation effect and parametric resonance of dynamic loadings were also illustrated. These results provide a guideline to optimally design drilling and blasting, such that the blasting stress wave is judiciously avoided to have a frequency of approximately double the pillar’s natural frequency.
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On the mechanism of pillar rockbursts induced by exponential blasting stresses in underground mining
Paper presented at the ISRM International Symposium - EUROCK 2020, physical event not held, June 2020.
Paper Number: ISRM-EUROCK-2020-211
Published: June 14 2020
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Deng, Jian. "On the mechanism of pillar rockbursts induced by exponential blasting stresses in underground mining." Paper presented at the ISRM International Symposium - EUROCK 2020, physical event not held, June 2020.
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