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<p>The soil extrusion effect induced by pile driving poses a significant risk to the safe operation of buried pipelines in soft soil foundations. It is therefore essential to investigate the mechanical response of pipelines under such conditions. In this study, field tests were first carried out to explore the propagation law of soil pressure in soft soil foundations subjected to pile driving-induced extrusion and to reveal the dynamic response characteristics of adjacent High-Density Polyethylene (HDPE) pipelines. Second, an integrated finite element model of the HDPE pipe-soft soil-pile system was established using the Arbitrary Lagrangian-Eulerian (ALE) large-deformation meshing method in Abaqus. Comparison between the numerical results and field measurements confirmed the accuracy of the model and the reliability of the tests, achieving an accurate simulation of the dynamic response of the buried pipeline under soil extrusion. Finally, further numerical analyses were conducted to evaluate the influence of pipe diameter, pipeline burial depth, pile–pipe distance, and pile driving depth. The main findings are as follows: (1) The deformation of the pipeline near the pile side is significantly greater than that at the far end, while the top and bottom parts of the pipeline experience the least deformation.(2) The horizontal displacement of the pipeline increases with pile driving depth until approximately 15&#xa0;m; beyond this depth, the variation in pipeline stress and displacement diminishes.(3) When the pile–pipe distance exceeds 7.1 times the pile diameter, the effect of soil extrusion on the pipeline becomes negligible.(4) Safe operation of the pipeline can be ensured by controlling the burial depth between 2 and 3.5&#xa0;m, using a pipe diameter in the range of 500–600&#xa0;mm, and maintaining a pile-pipe distance greater than 7.1 times the pile diameter.</p>

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Field Test and Numerical Simulation Study on the Dynamic Response of Flexible Pipelines in Soft Soil Foundations Under Soil Compaction Induced by Pile Driving

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Jun Wang,
  • Hanbin Gong,
  • Laifu Song,
  • Hongtao Fu,
  • Ziyang Gao,
  • Junfeng Ni

摘要

The soil extrusion effect induced by pile driving poses a significant risk to the safe operation of buried pipelines in soft soil foundations. It is therefore essential to investigate the mechanical response of pipelines under such conditions. In this study, field tests were first carried out to explore the propagation law of soil pressure in soft soil foundations subjected to pile driving-induced extrusion and to reveal the dynamic response characteristics of adjacent High-Density Polyethylene (HDPE) pipelines. Second, an integrated finite element model of the HDPE pipe-soft soil-pile system was established using the Arbitrary Lagrangian-Eulerian (ALE) large-deformation meshing method in Abaqus. Comparison between the numerical results and field measurements confirmed the accuracy of the model and the reliability of the tests, achieving an accurate simulation of the dynamic response of the buried pipeline under soil extrusion. Finally, further numerical analyses were conducted to evaluate the influence of pipe diameter, pipeline burial depth, pile–pipe distance, and pile driving depth. The main findings are as follows: (1) The deformation of the pipeline near the pile side is significantly greater than that at the far end, while the top and bottom parts of the pipeline experience the least deformation.(2) The horizontal displacement of the pipeline increases with pile driving depth until approximately 15 m; beyond this depth, the variation in pipeline stress and displacement diminishes.(3) When the pile–pipe distance exceeds 7.1 times the pile diameter, the effect of soil extrusion on the pipeline becomes negligible.(4) Safe operation of the pipeline can be ensured by controlling the burial depth between 2 and 3.5 m, using a pipe diameter in the range of 500–600 mm, and maintaining a pile-pipe distance greater than 7.1 times the pile diameter.