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<p>The content of the maximum particle size group in gradation and particle breakage are the primary factors influencing the compaction effectiveness of coarse-grained soils during the compaction process. To investigate this influence mechanism in depth, this study employs a combined approach of discrete element method (DEM) and laboratory experiments, establishing a realistically shaped breakable particle model to conduct vibration compaction tests under varying contents of the maximum particle size group. The reliability of the model has been validated through laboratory experiments. Subsequently, the evolution patterns of particle breakage characteristics, porosity (permanent deformation), and dynamic resilient modulus (elastic deformation) were analyzed. The results demonstrate that changes in porosity are primarily governed by the displacement of particles in the maximum particle size group, while the enhancement in dynamic resilient modulus stems from the increased coordination number due to particle breakage, the reinforcement of contact force chain networks, and the densification effect resulting from the transition from anisotropy to isotropy. These findings provide a theoretical foundation for the quality control in the compaction of breakable coarse-grained soils.</p>

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DEM investigation of particle breakage effects on vibration-induced compaction deformation with varying maximum particle size group content

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Xingxin Duan,
  • Chuhan Huang,
  • Zhihong Nie,
  • Chuanfeng Fang,
  • Yulan Tang,
  • Tieyong Zhao

摘要

The content of the maximum particle size group in gradation and particle breakage are the primary factors influencing the compaction effectiveness of coarse-grained soils during the compaction process. To investigate this influence mechanism in depth, this study employs a combined approach of discrete element method (DEM) and laboratory experiments, establishing a realistically shaped breakable particle model to conduct vibration compaction tests under varying contents of the maximum particle size group. The reliability of the model has been validated through laboratory experiments. Subsequently, the evolution patterns of particle breakage characteristics, porosity (permanent deformation), and dynamic resilient modulus (elastic deformation) were analyzed. The results demonstrate that changes in porosity are primarily governed by the displacement of particles in the maximum particle size group, while the enhancement in dynamic resilient modulus stems from the increased coordination number due to particle breakage, the reinforcement of contact force chain networks, and the densification effect resulting from the transition from anisotropy to isotropy. These findings provide a theoretical foundation for the quality control in the compaction of breakable coarse-grained soils.