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<p>This study investigates the dynamic mechanical properties and failure characteristics of jointed gypsum under impact loading. Uniaxial dynamic tests were conducted on specimens with different joint angles to analyze their stress–strain behavior, energy dissipation, and failure modes across varying strain rates. At low strain rates, unloading rebound occurs, producing a closed stress–strain curve. As strain rate increases, deformation accumulates and the curve transitions to an open type due to irreversible damage. Intact, 0°, and 90° specimens mainly exhibit axial splitting, whereas 30°, 45°, and 60° specimens show mixed modes dominated by joint-plane sliding. Higher strain rates intensify crack activation, leading to crushing failure. Energy evolution proceeds through four stages: elastic storage, cracking initiation, continuous absorption, and splitting failure with or without energy release. Under identical impact pressure, intact specimens display the lowest reflection and highest transmission coefficients. Reflection peaks at 45°–60° and then decreases, while transmission shows the opposite trend. With increasing incident energy, reflected and absorbed energies grow linearly, whereas transmitted energy first rises then declines, especially at 30°–60°. Dynamic compressive strength and elastic modulus exhibit a U-shaped relation with joint angle, reaching minima at 45°. Both parameters increase with strain rate, with yield strength showing exponential growth and a marked rise beyond 65&#xa0;s⁻1. These findings elucidate the coupled effects of joint angle and strain rate on gypsum behavior, providing theoretical guidance for safe deep gypsum mining.</p>

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Mechanical behavior and damage mechanism of prefabricated jointed gypsum under uniaxial dynamic impact loading

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Yongxiang Ge,
  • Gaofeng Ren,
  • Xinping Li,
  • Chao Zhang,
  • Luwei Zhang,
  • Chen Xu,
  • Congrui Zhang

摘要

This study investigates the dynamic mechanical properties and failure characteristics of jointed gypsum under impact loading. Uniaxial dynamic tests were conducted on specimens with different joint angles to analyze their stress–strain behavior, energy dissipation, and failure modes across varying strain rates. At low strain rates, unloading rebound occurs, producing a closed stress–strain curve. As strain rate increases, deformation accumulates and the curve transitions to an open type due to irreversible damage. Intact, 0°, and 90° specimens mainly exhibit axial splitting, whereas 30°, 45°, and 60° specimens show mixed modes dominated by joint-plane sliding. Higher strain rates intensify crack activation, leading to crushing failure. Energy evolution proceeds through four stages: elastic storage, cracking initiation, continuous absorption, and splitting failure with or without energy release. Under identical impact pressure, intact specimens display the lowest reflection and highest transmission coefficients. Reflection peaks at 45°–60° and then decreases, while transmission shows the opposite trend. With increasing incident energy, reflected and absorbed energies grow linearly, whereas transmitted energy first rises then declines, especially at 30°–60°. Dynamic compressive strength and elastic modulus exhibit a U-shaped relation with joint angle, reaching minima at 45°. Both parameters increase with strain rate, with yield strength showing exponential growth and a marked rise beyond 65 s⁻1. These findings elucidate the coupled effects of joint angle and strain rate on gypsum behavior, providing theoretical guidance for safe deep gypsum mining.