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<p>This study investigated the behavior of clayey sand with high fines content subjected to dynamic compaction using two methods: Finite Element Method (FEM) modeling and cyclic triaxial testing. Researchers developed an axisymmetric numerical model to simulate the dynamic compaction process and calculate acceleration values and Cyclic Stress Ratios (CSR) with distance from impact. The model was verified against field acceleration measurements, achieving an error margin of ± 20%. Cyclic triaxial tests, conducted under 32&#xa0;kPa (2-m depth) and 53&#xa0;kPa (4-m depth) confining stresses, subjected samples to CSR values ranging from 0.05 to 0.60. Laboratory tests revealed distinct, stress-dependent deformation patterns: lower confining stress samples exhibited continuous compressive strain (maximum shear strain of 0.65% at CSR = 0.60), while higher confining stress samples transitioned from compressive to dilative strain at values exceeding 0.40. Analysis of shear strain distribution indicated that strains approaching the critical threshold for soil degradation (≈ 5%) occurred in near-surface zones. This finding highlighted a significant operational safety concern regarding equipment placement near impact locations. The integrated approach provided a comprehensive understanding of soil deformation and informed safety considerations during ground improvement.</p>

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A Study on Soil Behavior and Safety in Dynamic Compaction of Clayey Sand with High Fines Content and High Groundwater Table

  • 期刊论文

  • 发表日期：

    2025年11月21日

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

摘要

This study investigated the behavior of clayey sand with high fines content subjected to dynamic compaction using two methods: Finite Element Method (FEM) modeling and cyclic triaxial testing. Researchers developed an axisymmetric numerical model to simulate the dynamic compaction process and calculate acceleration values and Cyclic Stress Ratios (CSR) with distance from impact. The model was verified against field acceleration measurements, achieving an error margin of ± 20%. Cyclic triaxial tests, conducted under 32 kPa (2-m depth) and 53 kPa (4-m depth) confining stresses, subjected samples to CSR values ranging from 0.05 to 0.60. Laboratory tests revealed distinct, stress-dependent deformation patterns: lower confining stress samples exhibited continuous compressive strain (maximum shear strain of 0.65% at CSR = 0.60), while higher confining stress samples transitioned from compressive to dilative strain at values exceeding 0.40. Analysis of shear strain distribution indicated that strains approaching the critical threshold for soil degradation (≈ 5%) occurred in near-surface zones. This finding highlighted a significant operational safety concern regarding equipment placement near impact locations. The integrated approach provided a comprehensive understanding of soil deformation and informed safety considerations during ground improvement.