双线盾构隧道及其联络通道抗爆性能研究  

Study on Blast-resistant Performance of Construction of Double Shield Tunnels and its Link Line

作　　者：吴修贤 杨志勇[1] WU Xiu-xian;YANG Zhi-yong(School of Civil Engineering & Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《建材世界》2019年第2期75-77,89,共4页The World of Building Materials

基　　金：人民防空科学技术研究"十二五"计划重点资助项目(43150011)

摘　　要：该文针对既有双线盾构隧道及其联络通道复杂结构的防护问题,采用ANSYS/LS-DYNA非线性显示动力有限元程序并结合流固耦合算法,对不同TNT当量、不同炸药位置、不同埋深条件下结构的动力响应进行全面研究。结果表明:随着TNT当量的减小,结构钢筋与混凝土单元的Mises等效应力不断减小,TNT当量从542 kg降到275 kg减小的应力值大于TNT当量从275 kg降到145 kg减小的应力值。爆源位置对结构的整体损伤情况影响不大,结构某点的位移主要取决于该点距离爆源的距离。埋深较小时隧道顶部钢筋和混凝土的拉应力峰值较大,为了有效增强结构的抗爆性能应加大埋深。In order to protect the complex structure of double shield tunnels and its link line,ANSYS/LS-DYNA nonlinear display dynamic finite element program combined with fluid-structure coupling algorithm was used to different TNT equivalents,different blast positions and different structures buried depth.The dynamic response of the structure under conditions was thoroughly studied.The results show that with the decrease of TNT equivalent,the Mises equivalent stress of the structural steel and concrete elements decreases,and the TNT equivalent decreases from 542 kg to 275 kg.The reduced stress value is greater than the TNT equivalent reduced from 275 kg to 145 kg.The location of the blast source has little effect on the overall damage of the structure.The displacement of a certain point of the structure mainly depends on the distance of the point from the source.When the buried depth is small,the tensile stress of the steel and concrete at the top of the tunnel has a large peak value.In order to effectively enhance the anti-explosion performance of the structure,the buried depth should be increased.

关 键 词：盾构隧道 联络通道 流固耦合 抗爆性能 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]