【研究背景】
在易发生地质灾害的地区，地下管道的过度侧向运动经常会危及管道的结构完整性和可靠性，同时也会对周围的地质环境安全造成威胁。然而，目前研究领域中缺乏对于管土相互作用的深入研究，这也是本篇论文主要要解决的问题。
【研究内容】
本文基于材料点法（MPM）对管土相互作用进行了研究，重点关注了在管道侧向运动过程中，周围土壤在破坏后阶段的失效机制。通过与文献中大型模型试验结果的比较，验证了数值模型的准确性。研究分析了埋深、管径和土壤密度等因素对失效机制的影响，并发现在浅埋管道条件下，一般剪切破坏往往会导致地面隆起；随着管道埋深的增加，峰值土壤阻力也相应增加，并逐渐从一般剪切破坏转变为局部流动机制。此外，管径较小、埋深较大的条件下，峰值阻力后的软化效应减小。通过比较失效模式，发现嵌入比是管土相互作用模式的主要决定因素，而与土壤密度的影响相比较小。最后，本文探讨了预测土壤峰值侧向阻力的方法，以辅助地下管道的设计。
【研究意义】
本文采用MPM方法对管土相互作用进行了深入研究，揭示了在地下管道侧向运动中，周围土壤的失效机制和相关因素的影响规律，为地下管道的设计和安全运行提供了重要的理论支持。此外，本文提出了预测土壤峰值侧向阻力的方法，具有一定的实际应用价值。
来源：J. Pipeline Syst. Eng. Pract., ASCE
作者：Xie, Tian-Cheng, Zhu, Honghu, Zhang, Chunxin, Liu, Wei, Tan, Daoyuan
作者单位：南京大学
出版时间：2024-1-1
论文DOI：10.1061/jpsea2.pseng-1498
Modeling Pipe-Soil Interaction under Lateral Movement Using Material Point Method
Abstract: Excessive lateral movements of buried pipes in geohazard-prone areas frequently jeopardize the structural integrity and serviceability of pipelines, as well as the safety of the surrounding geoenvironments. Based on the material point method (MPM), this paper investigates the pipe-soil interactions under lateral pipe movements, with a focus on the failure mechanisms of the surrounding soil during post-failure stages. The accuracy of the numerical model is validated by comparison with the results of large-scale model tests in the literature. There is a strong correlation between the experimental and numerical results in terms of force-displacement relationships and soil failure patterns. The impacts of burial depths, pipe diameters, and soil densities on the failure mechanism are analyzed in detail. The results showed that general shear failure tends to occur in shallow pipe conditions, resulting in significant ground heave. As the pipe burial depth increases, the peak soil resistance increases accordingly, and a transition from general shear failure to a localized flow-around mechanism gradually evolves. Furthermore, the softening effect after the peak resistance is reduced under the smaller pipe diameter and greater buried depth conditions. Comparisons of failure patterns illustrate that the embedment ratio is the main determinant of pipe-soil interaction modes as compared with the soil density. Transition failure often occurs when the embedment ratio ranges from 4.5 to 9.5, with slight influences from pipe diameters and soil properties. Finally, the prediction of the soil peak lateral resistance is explored to assist in underground pipeline design.
Keywords: Pipe–soil interaction; Failure mode; Material point method (MPM); Soil resistance; Lateral movement
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