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<p>To investigate the dynamic response and pile-rock side friction weakening mechanism of pile foundations penetrating bead-shaped karst cavities under cyclic train loading, indoor scaled model tests were conducted with different static load ratio (SLR) and cyclic load ratio (CLR) combinations. The study analyzed cumulative pile-head settlement, load-settlement hysteretic responses, and axial force redistribution along the pile, finding that settlement increases with SLR and CLR (categorized into stable, developing, and failure modes). Axial force transfers to the pile tip with discontinuities at karst interfaces; pile-rock side friction degrades with load cycles, sensitive to CLR. A weakening coefficient <i>D</i> is introduced, whose evolution with CLR is governed by SLR. The findings provide a reference for dynamic stability and deformation control of railway bridge piles in karst regions.</p>

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Dynamic Response Characteristics and Weakening Mechanism of Pile-Rock Side Friction of Bead-Shaped Karst Pile Foundations under Train Loading

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Pan Ji,
  • Leiyi Liao,
  • Zhiqiang Yuan,
  • Xianjiang Gao,
  • Jiabing Zhang

摘要

To investigate the dynamic response and pile-rock side friction weakening mechanism of pile foundations penetrating bead-shaped karst cavities under cyclic train loading, indoor scaled model tests were conducted with different static load ratio (SLR) and cyclic load ratio (CLR) combinations. The study analyzed cumulative pile-head settlement, load-settlement hysteretic responses, and axial force redistribution along the pile, finding that settlement increases with SLR and CLR (categorized into stable, developing, and failure modes). Axial force transfers to the pile tip with discontinuities at karst interfaces; pile-rock side friction degrades with load cycles, sensitive to CLR. A weakening coefficient D is introduced, whose evolution with CLR is governed by SLR. The findings provide a reference for dynamic stability and deformation control of railway bridge piles in karst regions.