Dynamic Response and Blast-resistance Analysis of Double Thick Subway Tunnel Subjected to Blast Loading Within One Side of Tunnel
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摘要: 研究了单侧地铁隧道内爆炸荷载作用下双线地铁隧道的动力响应,并选用泡沫铝作为防爆措施进行了地铁隧道的抗爆分析.在土-结构动力相互作用分析中,采用有限元与无穷元相耦合的方法建立了由双线隧道及其周围有限成层土区、远场半无限土区的整体计算模型,其中土体的有限元模型是依据某地铁工程的地质勘探资料建立的.通过该实际地铁工程的数值仿真以及计算结果的对比分析,揭示了爆炸超压、双线隧道的埋深和间距以及隧道周围土质条件对隧道衬砌应力场的影响;研究结果也表明泡沫铝具有良好的缓冲吸能作用,是提高地铁隧道抗爆能力的一种有效措施.Abstract: This article investigated on the dynamic response of double track subway tunnel subjected to blast loading within one side of tunnel, and analyzed the blast resistance property of the subway tunnel by choosing foamed aluminum as the blast protection measure. An integral calculation model comprising of two -way subway tunnel and its neighboring finite stratified soil and the far-field semi-infinite soil was established by using the coupled finite and infinite element methods to investigate the interaction between soil and structural dynamic force. The finite element model of soil was established on the basis of geological exploration data of actual subway engineering. Through numerical simulation for the actual subway engineering and the comparative analysis on the calculated results, this article revealed the influence of the explosive overpressure, the embedded depth and the spacing interval of the double track tunnel, and the soil condition around the tunnel on the stress field of the tunnel lining. The results show that the foamed aluminum is of desirable cushioning effect and energy absorption property, which could be used as an efficient measure to improve the blast-resistance ability of the subway tunnel.
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Keywords:
- tunnels /
- explosive loading /
- dynamic response /
- blast resistance /
- foamed aluminum
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