爆炸冲击波在双层地铁站内的传播规律研究  

Study on Propagation Law of Explosive Shock Wave inside Metro Station

作　　者：舒奕展 王高辉[1,2] 卢文波[1,2] 杨广栋 陈明[1,2] Shu Yizhan;Wang Gaohui;Lu Wenbo;Yang Guangdong;Chen Ming(State Key Laboratory of Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,P.R.China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University,Wuhan 430072,P.R.China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,武汉430072

出　　处：《地下空间与工程学报》2020年第6期1859-1865,共7页Chinese Journal of Underground Space and Engineering

基　　金：湖北省技术创新专项重大项目(2017ACA102);国防基础科研计划(JCKY2018110C162)。

摘　　要：地铁站为地下封闭空间,发生爆炸往往会带来灾难性的后果,易成为恐怖爆炸袭击的重要目标。为研究地铁站爆炸冲击波传播规律,本文利用AUTODYN软件,对一典型两层两跨地铁站进行了数值模拟,给出了地铁站内部不同时刻的冲击波压力云图,得到了不同爆心距位置的压力时程曲线,研究了不同起爆层、侧墙、结构柱和楼梯对冲击波传播的影响,分析了冲击波超压峰值的衰减规律。计算结果表明,炸药在地铁站内爆炸,其冲击波传播明显异于自由空气中。在爆心距较小位置,有更多持续时间较短的峰值;在爆心距较大位置,压力时程曲线相对平缓。爆炸冲击波在站厅层和站台层的传播存在差异,且受到侧墙、结构柱、楼梯的影响。侧墙使近区冲击波超压明显增大,结构柱让柱间狭长区域的超压峰值出现上下小幅波动,楼梯的存在增强了迎爆面前方一段距离的超压,削弱了背爆面后方的超压。Metro station is an underground enclosed space,and the explosion often brings catastrophic consequences,which makes it an obvious target for terrorist bombing attacks.In order to figure out the law of the propagation of explosive shock wave in metro station,this study uses AUTODYN software to simulate a typical twostorey and two-span metro station.The pressure of shock wave at different time in metro station is given,and the pressure time history curves of different detonation centers are obtained.Besides,the effects of different detonation layers,side walls,structural columns and stairs on the propagation of shock wave are studied,then the attenuation rule of shock wave overpressure peak is analyzed.The calculation results show that the shock wave propagation of the explosive in metro station is obviously different from that in free air.There are more peaks with shorter duration at smaller detonation distance,and the pressure time history curve is relatively flat at larger detonation distance.There are differences in the propagation of explosive shock wave between the hall floor and the platform floor,and it is influenced by side walls,structural columns and stairs.The side wall significantly increases the overpressure of the shock wave in the near area,and the structural column makes the overpressure peak in the narrow space between the columns fluctuate slightly.The existence of stairs enhances the overpressure in the distance before the explosive surface and weakens the overpressure behind the back explosion surface.

关 键 词：地铁站 爆炸冲击波 超压 传播规律 

分 类 号：O382.1[理学—流体力学]