隧道并行输气管道爆炸对邻管的冲击效应分析

针对隧道内输气管道泄漏发生爆炸对相邻管道的潜在威胁，基于泄漏率的求解，得到爆炸气体的扩散分布规律，确定蒸气云爆炸的TNT当量；利用LS-DYNA有限元软件建立隧道并行输气管道爆炸模型，分析在不同的泄漏尺寸、爆心距和风速下，邻管对爆炸冲击的动力学响应。基于峰值振速的经验公式的验证，表明所采用的管隧模型的可行性。结果表明:在内压和爆炸荷载的共同作用下，隧道内管道的等效应力和速度会出现多个峰值，有别于开敞空间的爆炸规律；泄漏尺寸越小、爆心距和风速越大，管道的动力响应越小；相比爆心距和风速，管道的动力响应峰值对泄漏尺寸的变化更敏感。研究成果可为管隧结构在极端情况下的事故预防和维护抢修提供理论指导。

Analysis on impact effect of gas pipeline explosion to adjacent pipeline for parallel pipeline in tunnel

In view of the potential threats of gas pipeline explosion after leaking on adjacent one in the tunnel, the diffusion distribution of the explosive gas was obtained based on the solution of leakage rate, and the TNT equivalent of the vapor cloud explosion was determined. The LS-DYNA finite element software was used to establish the explosion model of parallel gas pipeline in the tunnel, and the dynamic response of the adjacent pipeline to explosion impact under different leakage sizes, explosion center distances and wind speeds was analyzed. The feasibility of the pipeline-tunnel model was indicated based on the verification of empirical formula about peak vibration velocity. The results showed that the equivalent stress and velocity of pipeline in the tunnel appear multiple peaks under the combined action of internal pressure and explosion load, which is different from the explosion laws in open space. The smaller the leakage size, and the larger the explosion center distance and wind speed, the smaller the dynamic response of the pipeline. Compared to the explosion center distance and wind speed, the dynamic response peak of the pipeline is more sensitive to the change of leakage size. The results can provide theoretical guidance for the accident prevention and the maintenance and repair of the pipeline-tunnel structure under extreme conditions.