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<p>Traffic loading is one of the primary factors affecting the settlement, distortion, and cracking of pipelines buried in soft soil. Therefore, to ensure the safe operation of pipelines, research on measures to control the effects of traffic loading on pipelines buried in soft soil is important. A three-dimensional integrated finite element model of a rigid pipe in soft soil under traffic loading was established using ABAQUS software and used to analyse the dynamic responses of rigid pipelines in soft soil under traffic loading. In addition, the most critical locations of pipelines buried in soft soil under traffic loading were determined. The critical location of a pipeline is at the centre of the bottom of the pipeline, where the stress and displacement reach their maximum. On the basis of these results, the protective effects of various methods, such as laying steel plates, laying reinforced concrete slabs, using controlled low-strength material (CLSM) as backfill, and vacuum preloading, were investigated systematically. The following conclusions were obtained: (1) Compared with the installation of steel plates, the application of reinforced concrete plates and the use of CLSM as backfill material resulted in the largest reductions in the von Mises stress and displacement of 19.6% and 61.4%, respectively. (2) Within the depth range of 0–1 m, after the installation of the steel plate and concrete plate, the topsoil pressure of the pipeline is 9.4% lower than that of the vacuum preloading method and CLSM backfilling method. As the depth increased, the vertical soil pressure was the lowest for the vacuum preloading method, with a reduction of 34.1%. In summary, the vacuum preloading method provided the best protective effect compared with the other control measures for pipelines. Therefore, when rigid pipelines are constructed in soft soil, the vacuum preloading method is preferred for soil treatment. If necessary, this method can be combined with other methods, such as the installation of steel plates or concrete slabs on the road surface, for optimal results to effectively reduce the stress and deformation of rigid pipelines and ensure their stability and safe operation. The findings of this study provide a scientific basis and theoretical support for improving the design of buried pipelines and thus ensuring the safety of engineering projects.</p>

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Numerical Simulation Study on Control Measures for Rigid Pipelines Buried in Soft Soil Under Traffic Loading

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • LaiFu Song,
  • Hao Ying

摘要

Traffic loading is one of the primary factors affecting the settlement, distortion, and cracking of pipelines buried in soft soil. Therefore, to ensure the safe operation of pipelines, research on measures to control the effects of traffic loading on pipelines buried in soft soil is important. A three-dimensional integrated finite element model of a rigid pipe in soft soil under traffic loading was established using ABAQUS software and used to analyse the dynamic responses of rigid pipelines in soft soil under traffic loading. In addition, the most critical locations of pipelines buried in soft soil under traffic loading were determined. The critical location of a pipeline is at the centre of the bottom of the pipeline, where the stress and displacement reach their maximum. On the basis of these results, the protective effects of various methods, such as laying steel plates, laying reinforced concrete slabs, using controlled low-strength material (CLSM) as backfill, and vacuum preloading, were investigated systematically. The following conclusions were obtained: (1) Compared with the installation of steel plates, the application of reinforced concrete plates and the use of CLSM as backfill material resulted in the largest reductions in the von Mises stress and displacement of 19.6% and 61.4%, respectively. (2) Within the depth range of 0–1 m, after the installation of the steel plate and concrete plate, the topsoil pressure of the pipeline is 9.4% lower than that of the vacuum preloading method and CLSM backfilling method. As the depth increased, the vertical soil pressure was the lowest for the vacuum preloading method, with a reduction of 34.1%. In summary, the vacuum preloading method provided the best protective effect compared with the other control measures for pipelines. Therefore, when rigid pipelines are constructed in soft soil, the vacuum preloading method is preferred for soil treatment. If necessary, this method can be combined with other methods, such as the installation of steel plates or concrete slabs on the road surface, for optimal results to effectively reduce the stress and deformation of rigid pipelines and ensure their stability and safe operation. The findings of this study provide a scientific basis and theoretical support for improving the design of buried pipelines and thus ensuring the safety of engineering projects.