The interaction between underground pipelines and soils is crucial to the design and maintenance of underground pipeline network systems. In this paper, the dynamic stiffness matrix in the frequency-domain of the buried pipeline is obtained by the improved scaled boundary finite element method (SBFEM) coupled with the finite element method (FEM) at the interface between the far and near fields. A new coordinate transformation together with a scaled line is introduced in the improved SBFEM. Combined with the mixed variable algorithm, the time-domain solution of the buried pipeline under dynamic loads is then obtained. The accuracy of the proposed algorithm was verified by numerical examples. A parametric study is performed to assess the influence of the anisotropic characteristics of the layered soils on the dynamic response of the pipeline, the result of which provides a reliable basis for engineering practice. The results show that these parameters have a significant impact on the pipeline. The understanding of this impact can contribute to the design, construction, and maintenance of the corresponding engineering projects.

中文翻译：

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交叉各向异性层状土中埋地钢管的动力响应分析

地下管道与土壤之间的相互作用对于地下管网系统的设计和维护至关重要。本文采用改进的比例边界有限元法（SBFEM）与远近场交界处的有限元法（FEM）相结合，得到了埋地管道频域的动态刚度矩阵。在改进的 SBFEM 中引入了一种新的坐标变换和比例线。结合混合变量算法，得到了埋地管道在动态载荷作用下的时域解。通过数值算例验证了所提算法的准确性。进行参数研究以评估层状土壤的各向异性特性对管道动态响应的影响，其结果为工程实践提供了可靠的依据。结果表明，这些参数对管道有显着影响。了解这种影响有助于相应工程项目的设计、施工和维护。