【研究背景】
随着城市化的加速推进，土地资源日益紧张，城市建设对地块的需求不断攀升。面对这一趋势，新的建筑结构不得不频繁在覆盖有地下管道的区域中兴建，这无疑给地下管道的结构完整性评估与基础工程设计带来了前所未有的挑战。尤其是在管道与建筑物交互作用的复杂环境中，传统的评估方法可能不再适用，迫切需要新的技术和方法来确保工程安全与管道的长期运营稳定性。然而，目前的研究在此领域尚存在不足，对于高密度建筑环境下管道安全的系统性研究和综合性评估方法开发尚处于起步阶段。
【研究内容】
南京大学朱鸿鹄教授团队采用物质点法（MPM）开展了一系列数值模拟研究，深入探讨了地面载荷诱发的埋地管道-地基土相互作用，特别是埋管地基的失效机理和土压力分布情况。本文通过将模拟结果与现有文献中的实验数据进行对比，验证了所提数值模型的准确性。本研究细致考察了埋置深度比和管道至载荷水平距离比对地基失效机制的影响，发现随着这两个比值的增加，管土系统的承载力得到了显著提升。特别是当水平距离比超过3或埋置深度比达到4时，管道对整体承载能力的贡献边际递减。此外，模拟结果显示，管土系统的失效模式随水平距离的增加从普朗特尔型基础失效转变为不对称失效模式。外部载荷的大小和管道的具体埋置位置均对管道周边土压力分布产生显著影响。研究还揭示了管土界面作为潜在滑移面的作用，以及其对剪切带可能产生的吸力效应。本文的分析结果为理解管土系统的失效模式提供了新的见解，对于地下管道和基础设施的设计与优化具有重要的参考价值。
论文详细分析了埋置比和水平距离比对失效机理的影响。结果表明，随着埋置比和水平距离比的增加，管土系统的承载力显著增加。当水平距离比大于3或埋置比达到4时，管道对承载能力的影响变得微不足道。随着水平距离的增加，管土系统的失效模式从普朗特尔型基础失效转变为不对称失效。外部载荷和管道的埋藏位置都会影响管道周围的土压力分布。管土界面可以为基础失效提供潜在的滑动面，并且可能对剪切带产生吸力效应。最后，文章提出了管土系统的失效模式的理解，以供地下管道和基础系统的设计使用。
【研究意义】
本文采用物质点法开展数值模拟研究，深入分析了地表载荷下埋地管道和地基土的相互作用。研究发现，随着管道埋置比和水平距离比的增加，管土系统的承载力显著增加。这一研究结果对于地下管道和基础系统的设计具有重要意义。此外，本文还归纳总结了管土系统的多种失效模式，为相关的防灾减灾工程提供了新的思路。
题名：Modeling pipe-soil interaction under surface loading using material point method
作者：Xie T.-C.; Zhu H.-H.; Tan D.-Y.; Kumar Shukla S.
来源：Tunnelling and Underground Space Technology, 147 (2024) 105709.
出版时间：2024-04-01·
DOI：10.1016/j.tust.2024.105709
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