爆炸荷载作用下复合钢板衬砌结构动力响应研究

Study on dynamic response of composite steel plate lining structure under explosion load

为提高地铁隧道结构的抗爆能力,根据复合钢板抗拉伸,剪切强度高的优点,提出了一种新型的复合钢板衬砌结构的地铁抗爆防护方法。结合南京地铁工程实例,通过动力学分析软件LS-DYNA建立复合钢板衬砌结构地铁隧道爆炸冲击数值模型,模拟了安装复合钢板的衬砌结构在发生爆炸时的瞬间动力响应。研究成果表明:炸药量的变化对复合钢板衬砌结构不同位置的影响程度不同,在距爆源位置较近处,衬砌加速度变化幅度一般远大于炸药量增加倍数,而其速度和位移增幅则与炸药量增加幅度基本保持一致;在爆炸作用下,衬砌结构在距爆源位置较近处受到的影响较大,且在y方向受到的影响相比x方向较大。研究成果可为复合钢板衬砌结构的设计与应用,以及地铁隧道防恐防爆紧急应对提供预案与依据。

In order to improve the anti-explosion ability of subway tunnel structure, according to the advantages of high tensile and shear strength of composite steel plate, a new anti-explosion protection method of composite steel plate lining structure is put forward. Combined with the nanjing metro project, a numerical model of explosion iMPact of composite steel plate lining structure was established by using dynamic analysis software LS-DYNA, and the transient dynamic response of composite steel plate lining structure was simulated when explosion occurred. The results show that the change of explosive content has different effects on different positions of the composite steel plate lining structure. In the place close to the explosion source, the change of acceleration of the lining is much larger than the increase of explosive content, while the increase of velocity and displacement is basically consistent with the increase of explosive content.Under the action of explosion, the lining structure is greatly affected in the position closer to the explosion source, and in the y direction is more affected than in the x direction. The research results can provide preplan and basis for the design and application of composite steel plate lining structure and emergency response of anti-terror and explosion-proof subway tunnel.