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Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock fragmentation.It involves analyses of the evolution patterns of blasting stress,characteristics of crack distri-bution,and rock fracture features in the specimens.First,blasting model experiments were carried out using the dynamic caustics prin-ciple to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock mass.The experi-mental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bot-tom rock mass.Subsequently,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion layers.The numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explo-sion becomes more pronounced,resulting in fewer cracks in the bottom rock mass.This illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

bottom cushion layerblastingcrack propagationcontinuum-discontinuum element methoddynamic stress intensity factor

Xinguang Zhu、Chenxi Ding、Zhe Sui、Hong Su、Xu Guo

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School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China

Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China

School of Chemical and Blasting Engineering,Anhui University of Science and Technology,Huainan 232001,China

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2025

10.1007/s12613-024-2941-5

矿物冶金与材料学报
北京科技大学

矿物冶金与材料学报

影响因子：0.609
ISSN：1674-4799
年,卷(期)：2025.32(2)