Although a significant amount of research has been conducted to investigate the deformation and failure of buried pipelines subjected to load disturbance, scarce information is available about the effect of weld geometry parameters on the dynamic behavior of buried pipelines under blast loads. In the present study, numerical method and range analysis method were conducted to investigate the effect of weld geometry parameters including bevel angle, residual weld height, weld root opening, and thickness of root face on the dynamic performance of welded X70 steel pipelines under subsurface detonation. The results showed that the deformation of explosion-front surface is larger than that of explosion-back surface of the buried pipeline. The bevel angle, residual weld height, and thickness of root face have different effects on the dynamic comparison index of the welded pipes including peak vibration velocity, peak equivalent stress, peak equivalent strain, and peak displacement. Reasonable configuration should be adopted to properly select the geometry and dimensions of welding groove due to the complex influence of the weld geometry parameters. Combined the present results with the designing practice and current standards, the suggested weld geometry parameters to decrease their effects on the dynamic behavior of the welded X70 steel pipeline are as follows: the bevel angle (25 ± 5°), residual weld height (less than 1 mm), weld root opening (3.5 ± 0.5 mm), and thickness of root face (1.6 ± 0.6 mm).

尽管已经进行了大量研究来研究埋地管道在载荷扰动下的变形和失效，但关于焊缝几何参数对爆炸载荷下埋地管道动态行为的影响的信息很少。本研究采用数值方法和极差分析方法研究了焊缝几何参数包括斜角、残余焊缝高度、焊根开口和根面厚度对焊接X70钢管在地下爆轰作用下动态性能的影响。 . 结果表明，埋地管道爆炸前表面的变形大于爆炸后表面的变形。斜角、残余焊缝高度、根面的厚度和厚度对焊管的峰值振动速度、峰值等效应力、峰值等效应变和峰值位移等动态比较指标有不同的影响。由于焊缝几何参数影响复杂，应采用合理配置，合理选择焊缝坡口的几何形状和尺寸。结合目前的设计实践和现行标准，建议的焊缝几何参数以减少其对焊接 X70 钢管动态行为的影响如下：斜角（25±5°），残余焊缝高度（小于小于 1 mm)、焊根开口 (3.5 ± 0.5 mm) 和根面厚度 (1.6 ± 0.6 mm)。和峰值位移。由于焊缝几何参数影响复杂，应采用合理配置，合理选择焊缝坡口的几何形状和尺寸。结合目前的设计实践和现行标准，建议的焊缝几何参数以减少其对焊接 X70 钢管动态行为的影响如下：斜角（25±5°），残余焊缝高度（小于小于 1 mm)、焊根开口 (3.5 ± 0.5 mm) 和根面厚度 (1.6 ± 0.6 mm)。和峰值位移。由于焊缝几何参数影响复杂，应采用合理配置，合理选择焊缝坡口的几何形状和尺寸。结合目前的设计实践和现行标准，建议的焊缝几何参数以减少其对焊接 X70 钢管动态行为的影响如下：斜角（25±5°），残余焊缝高度（小于小于 1 mm)、焊根开口 (3.5 ± 0.5 mm) 和根面厚度 (1.6 ± 0.6 mm)。