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<p>The safety and operational thresholds of dynamic compaction techniques in loose clayey sand layers with high groundwater tables were investigated using stress-controlled cyclic triaxial tests. Simulations of intermittent and continuous loading patterns were conducted at confinement pressures of 32&#xa0;kPa and 53&#xa0;kPa. Results identified a critical threshold at a cyclic stress ratio greater than 0.35, where the soil transitioned from efficient densification to unstable dilation, accompanied by a spike in the excess pore-water pressure ratio above 0.30. Analysis of the stiffness degradation index established maximum effective cycle limits of 3–5 blows for high-energy intermittent loading and 30 blows for shallow continuous loading. Continuous loading induced significant shear strains at the higher confinement pressure of 53&#xa0;kPa, dictating depth-dependent operational parameters. The findings supported an operational protocol integrating cumulative and impact-control strategies, analytically linked to the applied energy factor through a site-specific constant derived from geophysical testing.</p>

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Evaluation of Safety Operational Thresholds for Dynamic Compaction Techniques in Saturated Clayey Sands

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Suttisak Soralump,
  • Diandri Fakhri Alditra,
  • Susit Chaiprakaikeow,
  • Suriyon Prempramote,
  • Kuo Chieh Chao

摘要

The safety and operational thresholds of dynamic compaction techniques in loose clayey sand layers with high groundwater tables were investigated using stress-controlled cyclic triaxial tests. Simulations of intermittent and continuous loading patterns were conducted at confinement pressures of 32 kPa and 53 kPa. Results identified a critical threshold at a cyclic stress ratio greater than 0.35, where the soil transitioned from efficient densification to unstable dilation, accompanied by a spike in the excess pore-water pressure ratio above 0.30. Analysis of the stiffness degradation index established maximum effective cycle limits of 3–5 blows for high-energy intermittent loading and 30 blows for shallow continuous loading. Continuous loading induced significant shear strains at the higher confinement pressure of 53 kPa, dictating depth-dependent operational parameters. The findings supported an operational protocol integrating cumulative and impact-control strategies, analytically linked to the applied energy factor through a site-specific constant derived from geophysical testing.