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<p>Under high in-situ stress, deep surrounding rock is affected by dynamic loads, such as vibrations, earthquakes, and blasting. Studying the mechanical response and failure mode of rocks under impact loads is crucial. Using FLAC3D software and the Hoek-Brown criterion, numerical simulations of split Hopkinson pressure bar tests were conducted on rock specimens under different impact velocities and confining pressures. Peak stress and failure strain increased with increasing strain rate; dynamic compressive strength and ductility increased with increasing confining pressure; and the residual stress level increased accordingly. Under uniaxial dynamic loading, the rock specimens mainly exhibited radial tension failure along the loading direction; under high confining pressure conditions, the stability of the rock specimens increased, and the failure mode changed from tension failure to compression–shear failure. Transmitted and dissipated energy increased with increasing confining pressure, while reflected energy decreased. Increases in both confining pressure and impact velocity increased the specific energy absorbed by the rock specimens.</p>

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Numerical Simulation Study of High In-Situ Stress Surrounding Rock Under Coupled Loading Based on FLAC3D and SHPB

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Shuyang Chen,
  • Cheng Liu,
  • Beibei Jia,
  • Fuxue Sun

摘要

Under high in-situ stress, deep surrounding rock is affected by dynamic loads, such as vibrations, earthquakes, and blasting. Studying the mechanical response and failure mode of rocks under impact loads is crucial. Using FLAC3D software and the Hoek-Brown criterion, numerical simulations of split Hopkinson pressure bar tests were conducted on rock specimens under different impact velocities and confining pressures. Peak stress and failure strain increased with increasing strain rate; dynamic compressive strength and ductility increased with increasing confining pressure; and the residual stress level increased accordingly. Under uniaxial dynamic loading, the rock specimens mainly exhibited radial tension failure along the loading direction; under high confining pressure conditions, the stability of the rock specimens increased, and the failure mode changed from tension failure to compression–shear failure. Transmitted and dissipated energy increased with increasing confining pressure, while reflected energy decreased. Increases in both confining pressure and impact velocity increased the specific energy absorbed by the rock specimens.