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<p>In northern Xinjiang, a canal project crosses extensive areas of collapsible loess, thus experiencing frequent slope sliding damage. Following reinforcement using dynamic compaction, substantial improvements in the stability of the canal have been observed. To examine the reinforcing impacts of dynamic compaction on the collapsible loess sections of this canal, this work adopts a combined finite difference method‒discrete element method (FDM-DEM) approach for macroanalyses and microanalyses. The results reveal the following: (i) The temporal variations in key parameters such as dynamic stress, porosity, and force chain distribution stabilize after 50&#xa0;ms, indicating that the single-point dynamic compaction process completes within this time frame. Soil deformation analysis reveals that the influence range of dynamic compaction is symmetrically distributed along the centerline of the hammer. Continuous blows initially strengthen reinforcement, stabilizing after six blows. (ii) When the distance between adjacent compaction points is less than 4.5 times the hammer’s radius (<i>R</i>), soil uplift occurs. Conversely, when this separation exceeds 6.0<i>R</i>, the interactions between adjacent compaction points gradually weaken. The strength of the reinforcement effect during such adjacent-point compaction follows the order of diagonal points &gt; midpoints &gt; base of the initial hammer. (iii) Following dynamic compaction treatment, the overall displacement of the canal slope substantially decreases, and its stability coefficient increases by approximately 30%. The reinforcement effect gradually weakens as the compaction point height increases from the canal base to the canal top, with the most significant effect occurring when the compaction point is located near the canal bed.</p>

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Numerical simulation analysis of the dynamic compaction reinforcement of a collapsible loess canal based on FDM‒DEM coupling

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Haozhen Xu,
  • Lingkai Zhang,
  • Chong Shi

摘要

In northern Xinjiang, a canal project crosses extensive areas of collapsible loess, thus experiencing frequent slope sliding damage. Following reinforcement using dynamic compaction, substantial improvements in the stability of the canal have been observed. To examine the reinforcing impacts of dynamic compaction on the collapsible loess sections of this canal, this work adopts a combined finite difference method‒discrete element method (FDM-DEM) approach for macroanalyses and microanalyses. The results reveal the following: (i) The temporal variations in key parameters such as dynamic stress, porosity, and force chain distribution stabilize after 50 ms, indicating that the single-point dynamic compaction process completes within this time frame. Soil deformation analysis reveals that the influence range of dynamic compaction is symmetrically distributed along the centerline of the hammer. Continuous blows initially strengthen reinforcement, stabilizing after six blows. (ii) When the distance between adjacent compaction points is less than 4.5 times the hammer’s radius (R), soil uplift occurs. Conversely, when this separation exceeds 6.0R, the interactions between adjacent compaction points gradually weaken. The strength of the reinforcement effect during such adjacent-point compaction follows the order of diagonal points > midpoints > base of the initial hammer. (iii) Following dynamic compaction treatment, the overall displacement of the canal slope substantially decreases, and its stability coefficient increases by approximately 30%. The reinforcement effect gradually weakens as the compaction point height increases from the canal base to the canal top, with the most significant effect occurring when the compaction point is located near the canal bed.