Abstract: Aiming at leak explosion of the natural gas pipeline, blast shock wave overpressure model was used, combining with TNT equivalent method to calculate the overpressure. Then the range of explosion damage was determine, and the main factors that affect the overpressure were found. Therefore the measures to reduce the overpressure were put forward, which provides the basis for the natural gas pipeline operation safe and emergency.

Key words: Explosion ,  Shock wave mode , TNT equivalent method , Overpressure , Obstacle

摘要： 　    针对天然气管道泄漏爆炸，采用爆炸冲击波超压模型，结合ＴＮＴ当量法对超压进行理论计算，确定了其爆炸事故的伤害范围，找到了影响超压的主要影响因素，提出了减小冲击波超压的措施，为制订天然气管道安全运行及应急预案提供了依据。

关键词: 　爆炸 , 　冲击波模型 , 　ＴＮＴ当量法 , 　超压, 障碍物