Fault caused by earthquake is harmful to buried pipelines. Long-distance transportation pipelines will inevitably cross the seismic fault zones. In this paper, a numerical simulation model of X80 pipeline under reverse faulting with a crossing angle of 60° was established. Damage evolution mechanism of buried steel pipeline was analyzed. Effects of internal pressure and diameter-thickness ratio on the stress, strain and displacement of pipeline were discussed. The results show that the buckling phenomenon is more severe in the hanging wall than that in the footwall for reverse fault. For non-pressure pipeline, local collapse occurs on the compression side. When the pipeline wall buckles, the axial stress is released, and high-stress is mainly concentrated on the collapsed position. For pressure pipeline, the internal pressure aggravates the buckling degree. Then, wrinkles appear on the compression side. The results can provide a reference for anti-seismic construction, repair and maintenance of buried pipeline.

地震造成的故障对地下管道有害。长途运输管道将不可避免地穿越地震断裂带。本文建立了X80管道反向断层，交叉角为60°的数值模拟模型。分析了埋地钢管的损伤演化机理。讨论了内部压力和直径-厚度比对管道应力，应变和位移的影响。结果表明，对于逆向断层，悬挂壁的屈曲现象比下盘的屈曲现象更为严重。对于非压力管道，局部塌陷发生在压缩侧。当管道壁弯曲时，轴向应力被释放，高应力主要集中在塌陷位置。对于压力管道，内部压力会加剧屈曲度。然后，皱纹出现在受压侧。研究结果可为地下管道的抗震施工，维修和保养提供参考。