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<p>The dynamic response and damage evolution of buried concrete pipelines in soft soil under traffic loads were investigated using finite element analysis and damage mechanics. A three-dimensional vehicle-pipe-soil coupled model was developed, incorporating a user-defined subroutine to simulate moving vehicle loads.Model reliability was validated against field tests, with the peak axial and hoop stresses showing relative errors of 2.7% and 6.1%, respectively. Results showed that soft soil, characterized by high compressibility and low strength, induced the most pronounced stress, strain, and displacement in the pipeline, significantly exceeding those in clay and loess. Damage analysis revealed distinct failure mechanisms: the pipe invert exhibited a brittle response governed by tensile damage under high stress triaxiality, while the pipe sides underwent ductile deformation with cumulative compressive-shear damage and equivalent plastic strain. Under cyclic loading, damage increased, but its growth rate diminished over time, whereas plastic strain accumulated continuously. This suggested that long-term performance was influenced by both plastic deformation and damage evolution, with plastic strain accumulation playing a more prominent role under the examined conditions. The findings support the use of differentiated protection strategies for pipeline design in soft soil regions.</p>

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Mechanical Response and Damage Mechanism of Concrete Pipe Buried in Soft Soil under Traffic Load

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Laifu Song,
  • Shengyuan Ma,
  • Ran Qiao,
  • Ruifeng Zhou,
  • Shiming Chen,
  • Lisheng Pan

摘要

The dynamic response and damage evolution of buried concrete pipelines in soft soil under traffic loads were investigated using finite element analysis and damage mechanics. A three-dimensional vehicle-pipe-soil coupled model was developed, incorporating a user-defined subroutine to simulate moving vehicle loads.Model reliability was validated against field tests, with the peak axial and hoop stresses showing relative errors of 2.7% and 6.1%, respectively. Results showed that soft soil, characterized by high compressibility and low strength, induced the most pronounced stress, strain, and displacement in the pipeline, significantly exceeding those in clay and loess. Damage analysis revealed distinct failure mechanisms: the pipe invert exhibited a brittle response governed by tensile damage under high stress triaxiality, while the pipe sides underwent ductile deformation with cumulative compressive-shear damage and equivalent plastic strain. Under cyclic loading, damage increased, but its growth rate diminished over time, whereas plastic strain accumulated continuously. This suggested that long-term performance was influenced by both plastic deformation and damage evolution, with plastic strain accumulation playing a more prominent role under the examined conditions. The findings support the use of differentiated protection strategies for pipeline design in soft soil regions.