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<p>To understand the phenomenon of vibration-induced frictional weakening of granular materials,&#xa0;experimental studies were conducted using a&#xa0;resonant column apparatus. Superimposed vibrations with controlled amplitude and frequency were applied on sheared dry glass bead specimens vibration. Experiments demonstrate that vibration reduces deviatoric stress, which slowly recovers to its initial state once vibration is terminated while monotonic shearing continues. The influential factors considered in the investigation of glass beads of three particle diameters (0.3 mm, 0.6 mm, and 0.8 mm) are vibration frequency, amplitude, confining pressure, and particle diameter. Experimental evidence shows a more notable drop in deviatoric stress with&#xa0;increasing amplitude and frequency of the vibration, particle diameter and decreasing confining pressure. Using dimensional analysis, we derive a general mathematical expression for the dimensionless vibration number that includes the effect of these factors. With the adoption of the proposed vibration number, a physical scaling is revealed, which correlates the degree of shear weakening, quantified by the reduction in the coefficient of friction and the intensity of vibration, with the vibration of sheared dry glass bead specimens, characterised by the vibration number.</p> Graphical abstract <p></p>

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Experimental investigation on the vibration-induced frictional weakening of granular assembly

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Muhammad Shahroz Khalid,
  • Jianbo Fei,
  • Muhammad Irslan Khalid,
  • Xiangsheng Chen

摘要

To understand the phenomenon of vibration-induced frictional weakening of granular materials, experimental studies were conducted using a resonant column apparatus. Superimposed vibrations with controlled amplitude and frequency were applied on sheared dry glass bead specimens vibration. Experiments demonstrate that vibration reduces deviatoric stress, which slowly recovers to its initial state once vibration is terminated while monotonic shearing continues. The influential factors considered in the investigation of glass beads of three particle diameters (0.3 mm, 0.6 mm, and 0.8 mm) are vibration frequency, amplitude, confining pressure, and particle diameter. Experimental evidence shows a more notable drop in deviatoric stress with increasing amplitude and frequency of the vibration, particle diameter and decreasing confining pressure. Using dimensional analysis, we derive a general mathematical expression for the dimensionless vibration number that includes the effect of these factors. With the adoption of the proposed vibration number, a physical scaling is revealed, which correlates the degree of shear weakening, quantified by the reduction in the coefficient of friction and the intensity of vibration, with the vibration of sheared dry glass bead specimens, characterised by the vibration number.

Graphical abstract