爆炸荷载作用下交叉式人防隧道动力响应研究  

Study on Dynamic Response of Crossed Civil Air Defense Tunnel Under Blast Loading

作　　者：陈桂林 CHEN Guilin(China Railway 24^(th) Bureau Group Fujian Railway Construction Co.Ltd.,Fuzhou Fujian 350013,China)

机构地区：[1]中铁二十四局集团福建铁路建设有限公司,福建福州350013

出　　处：《铁道建筑技术》2023年第4期26-29,43,共5页Railway Construction Technology

基　　金：中铁二十四局集团福建铁路建设有限公司科技研发项目(2021-15)。

摘　　要：对于位于地下空间的人防结构,其安全问题至关重要。当地面发生巨大爆炸时,产生的冲击波势必会对地下结构产生一定影响。为研究地下人防结构在爆炸荷载作用下的动力响应,依托某地下人防工程,借助ANSYS/LS-DYNA软件,对地下交叉式人防隧道在土中爆炸冲击荷载下的响应进行数值模拟,分析冲击波在土中的传播规律及人防结构位移、应力等力学响应,以期为地下人防工程爆破施工与安全防护提供参考。结果表明:爆炸荷载作用下,拱顶位置最早出现振动响应,在结构同一断面拱顶振速曲线峰值明显高于拱腰振速曲线峰值,边墙次之,拱脚处最低;随爆心距增大,衬砌结构振速峰值与最大拉压应力均随之减少,且拱顶部位最易受顶部爆炸荷载作用影响,在实际设计与施工中应予以重视。For civil air defense structure located in underground spaces,its safety is of paramount importance.When a huge explosion occurs at ground level,the resulting shock waves will inevitably have some impact on the underground structures.In order to study the dynamic response of underground civil air defense structure under blast loads,this article relies on an underground civil air defense project to conduct numerical simulations of the response of underground crossover civil air defense tunnels under blast impact loads in soil with the help of ANSYS/LS-DYNA software,and analyzes the propagation law of shock waves in soil and the mechanical response of the civil air defense structure in terms of displacement and stress,with a view to providing reference for blast construction and safety protection of underground civil air defense projects.The conclusions show that under the blast load,the earliest vibration response occurs at the top of the arch,and the peak vibration velocity curve at the same section of the structure is significantly higher than the peak vibration velocity curve at the waist of the arch,followed by the side walls,and the lowest at the foot of the arch.With the increase of the blast core distance,the peak vibration velocity and maximum tensile stress of the lining structure will be reduced,and the location of the vault is the most vulnerable to the effect of the top blast load,which should be paid attention to in the actual design and construction.

关 键 词：爆炸荷载 交叉式人防隧道 数值模拟 动力响应 

分 类 号：O383[理学—流体力学] U459.9[理学—力学]