爆炸冲击波在地铁隧道内的传播规律研究

The Dissemination Rule of Blasting Shock-wave in Subway Tunnel

地铁是重要的生命线工程,具有造价高、使用周期长、运行期间内部人员密集等特点,极易成为恐怖爆炸袭击的目标。炸药在地铁隧道内爆炸产生的冲击波由于受到地铁内衬砌的限制,会发生反射和叠加,其超压峰值远远大于自由场中的峰值,冲击波的传播过程也会更加复杂。为了探明爆炸冲击波在地铁隧道内的传播规律,以南京地铁隧道为例,利用LS-DYNA动力分析软件,采用流固耦合算法,对10 kg TNT炸药在地铁内的爆炸过程进行数值模拟,分析爆炸冲击波的传播过程,得出沿地铁隧道纵向超压的衰减规律,研究成果可为地铁隧道防恐怖爆炸袭击应急预案的制定和政府决策提供依据。

Metro is a significant component of the lifeline engineering in a city and it has the characteristics of high cost, long service cycle and densely populated inner during the operation, which makes it a target of the terror- ism bomb attack. The explosive blasting in subway tunnel induces shock-wave, it will generate reflection and super- position, the peak overpressure of shock-wave is far greater than that in free field, and, the propagation of shock-wave is more complicated. In order to obtain the dissemination rule of blasting shock-wave in subway tunnel, taking Nan- jing subway tunnel as an example, the dynamic analysis software LS-DYNA and fluid-structure coupling computation were utilized in the model, a numerical simulation about 10kg TNT blasting in the subway tunnel was carried out, the propagation of blasting shock-wave was analyzed to get overpressure attenuation laws along longitudinal section of the subway tunnel. It offers base for emergency preplan and gorernment desision at terrorism bomb attack in subway tunnel.