Abstract Although polyethylene (PE) pipelines have been extensively used in engineering fields, very little effort has been devoted to their abilities against blast loads. In the present study, numerical method is used to predict the dynamic performance of buried small-diameter PE pipelines under subsurface localized explosion. The effectiveness of a numerical model was firstly evaluated to entirely replicate the experimental damage process of PE pipelines. Then, parametric studies are performed to show the dynamic response of PE pipelines under subsurface localized explosion. Finally, the main influencing factors are analyzed according to the grey system theory. The results show that the front and back faces, top and bottom of the pipelines, where facing explosive charge are the main failure positions of PE pipelines due to the local effect of blast load. The peak pressure, resultant displacement, peak effective strains, and peak vibration velocities of the PE pipelines increase with the explosive mass increasing. The peak pressures and peak vibration velocities decrease with the pipe size decreasing. Reducing the pipe size could increase the maximum effective strain of the pipe facing the explosive center, and reduce the vibration velocity of the pipe near the explosive center. The change law of peak pressure of PE pipelines caused by changing explosive mass and pipe size is different from that of peak vibration velocity of PE pipelines. As a sequence, the three influencing factors (explosive mass, pipe size and blasting distance) should also be considered to analyze the influence of subsurface explosion on the buried small-diameter PE pipelines.

中文翻译：

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地下局部爆炸下埋地聚乙烯管道动力性能预测及影响因素分析

摘要 尽管聚乙烯（PE）管道已广泛应用于工程领域，但很少有人致力于研究其抗爆炸载荷的能力。在本研究中，数值方法被用于预测地下局部爆炸下埋地小直径聚乙烯管道的动态性能。首先评估数值模型的有效性，以完全复制 PE 管道的实验损坏过程。然后，进行参数研究以显示地下局部爆炸下 PE 管道的动态响应。最后根据灰色系统理论分析了主要影响因素。结果表明，管道的正面和背面、顶部和底部，由于爆炸载荷的局部效应，PE管道的主要失效位置是面对爆炸装药。PE管道的峰值压力、合成位移、峰值有效应变和峰值振动速度随着爆炸质量的增加而增加。峰值压力和峰值振动速度随着管道尺寸的减小而减小。减小管道尺寸可以增加管道面对爆炸中心的最大有效应变，降低管道在爆炸中心附近的振动速度。爆炸质量和管道尺寸变化引起的PE管道峰值压力的变化规律与PE管道峰值振动速度的变化规律不同。作为一个顺序，三个影响因素（爆炸质量，