The present study investigates the mechanical behavior of high-pressure pipelines installed through horizontal directional drilling (HDD), a crucial trenchless installation method, under seismic loads. Utilizing the finite element method and artificial viscoelastic boundary conditions, this paper analyzes the stress response of pipelines subjected to seismic loads in two directions. The seismic loads are applied using the response spectrum method, and the pipeline stress is analyzed in time history. A comparison of the stress in pipelines installed through the HDD method and the traditional open-cut method is conducted, and the impact of earthquake magnitude on pipeline stress is evaluated. The results indicate that the pipeline stress is greater when the seismic acceleration acts transversely, with bending deformation being the dominant mode of response. A 9.29% increase in maximum stress is observed for each increment in earthquake magnitude. Furthermore, the stress in pipelines installed through the HDD method is 48% lower than that of pipelines installed using the open-cut method when subjected to transverse seismic loads.

本研究调查了通过水平定向钻孔 (HDD) 安装的高压管道在地震载荷下的力学性能，这是一种重要的非开挖安装方法。利用有限元法和人工粘弹性边界条件，本文分析了管道在两个方向上承受地震载荷的应力响应。采用反应谱法施加地震荷载，对管道应力进行时程分析。对比了水平直挖法和传统明挖法安装管道的应力，评价了地震震级对管道应力的影响。结果表明，当地震加速度横向作用时，管道应力较大，弯曲变形是主要的响应模式。地震震级每增加一次，最大应力就会增加 9.29%。此外，采用直挖法安装的管道在承受横向地震荷载时的应力比采用明挖法安装的管道低48%。