燃气管道爆管物理爆炸对并行邻管的冲击行为  

Impact Behavior of Gas Pipeline Physical Blasting on Parallel Adjacent Pipeline

作　　者：荣刚 RONG Gang

机构地区：[1]天津泰达滨海清洁能源集团有限公司,天津300308

出　　处：《煤气与热力》2019年第9期36-42,J0043,J0044,共9页Gas & Heat

摘　　要：针对燃气管道爆管冲击同沟并行管道的潜在威胁,基于能量相当法则,确定爆管等效TNT当量。采用光滑粒子流体动力学-有限单元法(SPH-FEM),在验证有限元模型精度的基础上,基于软件LS-DYNA和LS-PREPOST建立缺陷管道-土壤-炸药耦合的三维实体爆炸模型,研究爆炸荷载下腐蚀尺寸(腐蚀深度及投影面半径)对缺陷管道动力响应的影响。结果表明:SPH-FEM耦合法可形象展示土体鼓包的宏观形态且模拟所得结果与试验数据吻合较好;管体最大应力的部位与腐蚀缺陷数量有关,单腐蚀缺陷管道的最大应力位于腐蚀中心处,双腐蚀缺陷管道的最大应力部位位于两腐蚀缺陷间的未腐蚀区域;双腐蚀管道的最大应力较单腐蚀管道大,最大振速较单腐蚀管道小,双腐蚀管道较单腐蚀管道发生失效的可能性大。随着腐蚀深度的增大,单腐蚀和双腐蚀管体的最大应力均增大;腐蚀深度对管体振速的影响较小,不同腐蚀深度下,单腐蚀或双腐蚀管道的振速时程曲线均基本重合,单腐蚀和双腐蚀管道振速时程曲线形式基本一致,单腐蚀较双腐蚀管道最大振速大。不同投影面半径下,单腐蚀和双腐蚀管道的应力时程曲线均基本重合,振速曲线也基本重合,说明投影面半径对管道的动力响应影响较小;单腐蚀较双腐蚀管道最大振速大;随着腐蚀投影面半径的增大,管体的最大应力增大。Aiming at the potential threat of gas pipeline blasting impacting parallel pipelines in the same ditch,the equivalent TNT equivalent of gas pipeline blasting was determined based on the energy equivalence rule. The smooth particle hydrodynamic finite element method( SPH-FEM) is used to verify the accuracy of the finite element model. Based on the software LS-DYNA and LS-PREPOST,a three-dimensional solid explosion model of defective pipeline-soilexplosive coupling is established to study the effect ofcorrosion size( corrosion depth and projection plane radius) on the dynamic response of defective pipeline under explosion load. The results show that the SPHFEM coupling method can visually display the macroscopic shape of soil bulge,and the simulation results are in good agreement with the experimental data. The maximum stress of the pipeline is related to the number of corrosion defects,the maximum stress of the single corrosion defect pipeline is located in the corrosion center,and the maximum stress of the double corrosion defect pipeline is located in the non-corrosive area between the two corrosion defects. The maximum stress of double-corroded pipeline is larger than that of singlecorroded pipeline,the maximum vibration velocity is smaller than that of single-corroded pipeline,and the failure probability of double-corroded pipeline is larger than that of single-corroded pipeline. As the corrosion depth increases,the maximum stress of both single and double corroded pipelines increases. The corrosion depth has little effect on the vibration velocity of the pipeline. Under different corrosion depths,the vibration velocity time-history curves of single and double corroded pipelines are basically coincident. The vibration velocity time-history curve types of single and double corroded pipelines are basically the same,and the maximum vibration velocity of single-corroded pipeline is higher than that of double-corroded pipeline.Under different projection surface radiuses,the stress time-history curves of single and

关 键 词：爆炸冲击 腐蚀缺陷 并行管道 光滑粒子流体动力学 有限单元法 

分 类 号：TU996.7[建筑科学—供热、供燃气、通风及空调工程]