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<p>Understanding suffusion-induced soil arching degradation is essential for the stability assessment and risk mitigation of geotechnical infrastructures when subjected to seepage flow. The effect of suffusion on formed soil arching composed of widely graded soil is studied using a three-dimensional trapdoor model via coupled CFD-DEM framework. The primary objective lies on demonstrating the micro-mechanical impact of suffusion-induced fine migration on the degradation of soil arching under varying initial packing densities. The analysis includes the spatial heterogeneity of fine content loss and identifies the corresponding stress evolution in each area of soil arch. A classification of three micro-mechanical zones is put forward based on distinct normalized stress magnitude and local fine content variation. The contact type composition, fine sand stress contribution, force chains and contact fabric anisotropy are quantitatively compared in each zone. Results reveal that dense soil is less susceptible to suffusion thus retain an arching integrity and anisotropic fabric, while the loose soil is subjected to a substantial fine loss thus a secondary arching is formed upon the original protected zone. This numerical study highlights the influence of packing density on soil arching vulnerability against suffusion through micro-mechanical interpretations for arching degradation.</p>

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Numerical investigation of mechanical degradation of soil arching in gap-graded soils induced by suffusion

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Junfeng Sun,
  • Hao Xiong,
  • Zezhi Deng,
  • Fan Chen,
  • Zengle Ren,
  • Xiangsheng Chen

摘要

Understanding suffusion-induced soil arching degradation is essential for the stability assessment and risk mitigation of geotechnical infrastructures when subjected to seepage flow. The effect of suffusion on formed soil arching composed of widely graded soil is studied using a three-dimensional trapdoor model via coupled CFD-DEM framework. The primary objective lies on demonstrating the micro-mechanical impact of suffusion-induced fine migration on the degradation of soil arching under varying initial packing densities. The analysis includes the spatial heterogeneity of fine content loss and identifies the corresponding stress evolution in each area of soil arch. A classification of three micro-mechanical zones is put forward based on distinct normalized stress magnitude and local fine content variation. The contact type composition, fine sand stress contribution, force chains and contact fabric anisotropy are quantitatively compared in each zone. Results reveal that dense soil is less susceptible to suffusion thus retain an arching integrity and anisotropic fabric, while the loose soil is subjected to a substantial fine loss thus a secondary arching is formed upon the original protected zone. This numerical study highlights the influence of packing density on soil arching vulnerability against suffusion through micro-mechanical interpretations for arching degradation.