双线盾构隧道及其联络通道抗爆性能研究
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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.
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.
引文
[1] 师燕超.爆炸荷载作用下钢筋混凝土结构的动态响应行为与损伤破坏机理[D].天津:天津大学,2009.
[2] 柳锦春,方秦,龚自明,等.爆炸荷载作用下钢筋混凝土梁的动力响应及破坏形态分析[J].爆炸与冲击,2003(1):25-30.
[3] Liu H.Dynamic Analysis of Subway Structures Under Blast Loading[J].Geotechnical & Geological Engineering,2009,27(6):699-711.
[4] 北京市规划委员会.地铁设计规范[M].北京:中国建筑工业出版社,2014.
[5] Liu M Y,Zhi-Fang L U.Analysis of Dynamic Response of Yangtze River Tunnel Subjected to Contact Explosion Loading[J].Journal of Wuhan University of Technology,2007,29(1):113-117.
[6] 洪武,周健南,徐迎,等.拱形结构爆炸作用荷载分布规律研究[J].岩土力学,2012,33(11):3407-3413,3418.
[7] 孔德森,孟庆辉,张伟伟,等.爆炸荷载作用下地铁隧道的冲击反应研究[J].振动与冲击,2012,31(12):68-72.
[8] 刘中宪,王治坤,张欢欢,等.地下超高性能钢纤维混凝土隧道衬砌抗爆性能模拟研究[J].工业建筑,2018,48(2):116-122.
[2] 柳锦春,方秦,龚自明,等.爆炸荷载作用下钢筋混凝土梁的动力响应及破坏形态分析[J].爆炸与冲击,2003(1):25-30.
[3] Liu H.Dynamic Analysis of Subway Structures Under Blast Loading[J].Geotechnical & Geological Engineering,2009,27(6):699-711.
[4] 北京市规划委员会.地铁设计规范[M].北京:中国建筑工业出版社,2014.
[5] Liu M Y,Zhi-Fang L U.Analysis of Dynamic Response of Yangtze River Tunnel Subjected to Contact Explosion Loading[J].Journal of Wuhan University of Technology,2007,29(1):113-117.
[6] 洪武,周健南,徐迎,等.拱形结构爆炸作用荷载分布规律研究[J].岩土力学,2012,33(11):3407-3413,3418.
[7] 孔德森,孟庆辉,张伟伟,等.爆炸荷载作用下地铁隧道的冲击反应研究[J].振动与冲击,2012,31(12):68-72.
[8] 刘中宪,王治坤,张欢欢,等.地下超高性能钢纤维混凝土隧道衬砌抗爆性能模拟研究[J].工业建筑,2018,48(2):116-122.