中文摘要：

对大直径X70钢油气管道在接触爆炸下的破坏效应进行了野外化爆实验，获得了不同装药量及不同壁厚条件下钢管道的接触爆炸破坏特征。实验结果表明：接触爆炸载荷作用下管壁迎爆面局部破坏明显，且呈花瓣形破口，同时产生具有较大质量和动能的爆炸破片，破片与对面管壁碰撞后形成凹坑，甚至发生贯穿现象。基于动力有限元程序LS—DYNA及Lagrangian—Eulerian耦合方法，对钢管在外接触爆炸载荷作用下的非线性动态响应过程进行三维数值模拟，得到管壁迎爆面的变形破坏及对面管壁在爆炸破片碰撞下的后效作用过程，计算结果与实验结果符合良好。研究结果为在役油气管道的抗爆能力分析及安全性评估提供了参考依据。

英文摘要：

Field explosion experiments were carried out to investigate the contact explosion damage effects of large diameter X70 steel oil-gas pipes. The contact explosion damage characteristics of pipes with different pipe wall thickness under various that the local damage of the pipe wall facing exp vasse. In addition, the fragments with abundant k nomenon will occur after the opposite pipe wall nonlinear dynamic finite element computer code charge were analyzed. The experimental results show losion is predominant and there is a petal-shaped cre- inetic energy are formed. The dent or perforation phe- is impacted by the fragment. By means of an explicit LS-DYNA, the nonlinear dynamic response process of the steel pipe under contact explosion loading was numerically simulated with Lagrangian-Eulerian coupling method. The damage process of the pipe wall facing explosion and the after-effects of opposite pipe wall due to the impact of fragment were described. The numerical simulation results are in good agreement with experimental data. The results can provide important reference for the blast-resistant properties analysis and safety assessment of oil-gas pipes.