矿业科学学报2026，Vol.11Issue(2)：403-416,14.DOI:10.19606/j.cnki.jmst.2025078
不同冲击速度下煤体动态拉伸失稳演化机理与数值模拟研究
Research and numerical simulation on dynamic tensile instability evolution mechanism of coal under different impact velocities
摘要
Abstract
Understanding the strain-damage-energy dissipation mechanisms and evolution characteristics of deep coal and rock under impact loading is of great significance for the prevention and control of rockbursts.In this study,a Split Hopkinson Pressure Bar(SHPB)experimental system was employed to investigate the dynamic tensile instability mechanisms of coal under different impact velocities.The stress-strain-energy responses and damage-failure modes of coal specimens were analyzed.Further-more,a coupled numerical simulation approach integrating PFC3D and FLAC3D was applied,combined with fractal dimension analysis and fragment size distribution methods,to quantitatively characterize the macro-meso damage-failure features of coal under dynamic loading and to elucidate the energy conver-sion mechanisms and dynamic instability behavior.The results indicate that:① Impact velocity and static loading significantly influence dynamic tensile strength,strain rate,and damage degree.As im-pact velocity increases,fragmentation becomes more severe;under similar impact velocities,combined dynamic-static loading produces greater damage than impact loading alone.② At the macroscopic scale,the main crack initiates in the specimen's middle region,propagates toward the loading end,and eventually penetrates the specimen.At the mesoscopic scale,cracks initiate at the loading end,gradually extend toward the middle,and coalesce.Crack propagation exhibits stage-wise behavior,with tensile cracks dominating during the plastic deformation and failure stages.③ Higher impact velocities result in increased incident energy,dissipated energy,and dissipated energy density;under combined dynamic-static loading,both dissipated energy and dissipated energy density are higher than under sin-gle impact loading.关键词
冲击地压/SHPB试验/失稳/动态拉伸/能量耗散Key words
rockburst/SHPB experiment/instability/dynamic stretching/energy dissipation分类
矿业与冶金引用本文复制引用
张通,陈瑞报,马衍坤..不同冲击速度下煤体动态拉伸失稳演化机理与数值模拟研究[J].矿业科学学报,2026,11(2):403-416,14.基金项目
国家自然科学基金(42477201) （42477201）
安徽省优秀青年基金(2022AH030086) （2022AH030086）
安徽省重点研发计划(2023Z04020001) （2023Z04020001）
安徽省面上基金(2308085ME154) （2308085ME154）
深部煤炭开采与环境保护全国重点实验室基金(HNKY2024ZD201) （HNKY2024ZD201）
国家重点研发计划(2021YFC2800903) （2021YFC2800903）
