爆炸作用下土体隧道衬砌结构的动力响应
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摘要
为了找出爆炸动力作用下的隧道衬砌结构薄弱部位和力学规律,建立了土体隧道动力分析整体有限元模型;利用显式动力有限元程序Ansys/Ls-dyna进行了数值模拟,探讨了土体隧道衬砌结构在爆炸作用下不同部位的时间历程曲线;分析了爆炸作用下土体隧道衬砌结构的动力响应。结果显示:隧道衬砌结构肩部在x、y方向的位移都较大;隧道衬砌结构顶部在y方向的位移较大;隧道衬砌结构顶部、肩部的加速度峰值最大并且加速度曲线均出现了两次或多次峰值。这反映了爆炸冲击波有比较强烈的多次反射;各部位压力时程曲线波动较大,按照肩部、顶部、胯部、底部、腰部的顺序先后到达峰值;顶部和肩部σx峰值最大,顶部和底部σy峰值最大,顶部、肩部、底部τmax峰值最大。顶部和肩部出现最大拉应力说明爆炸对拱顶拱肩损伤较大,隧道衬砌结构将会最先在这两处发生破坏。
By establishing finite element integral model of soil tunnel dynamic analysis,the numerical simulation for soil tunnels is conducted through the explicit dynamic finite element program ANSYS/LS-DYNA,and the time-history curves of different element about soil tunnel lining structure under explosion are discussed.The purpose of the analysis is to obtain the mechanics laws and weak parts of soil tunnels,the most likely failure elements under the explosion shock action.It is meaningful of the analysis to prevent terrorist attacks which can cause tremendous loss of human life and to explore the properties of the collapse and damage of many buildings and constructions.The dynamic response of soil tunnel under the explosion action is analyzed,and therefore a reference foundation for antiknock design of tunnel is presented.
By establishing finite element integral model of soil tunnel dynamic analysis,the numerical simulation for soil tunnels is conducted through the explicit dynamic finite element program ANSYS/LS-DYNA,and the time-history curves of different element about soil tunnel lining structure under explosion are discussed.The purpose of the analysis is to obtain the mechanics laws and weak parts of soil tunnels,the most likely failure elements under the explosion shock action.It is meaningful of the analysis to prevent terrorist attacks which can cause tremendous loss of human life and to explore the properties of the collapse and damage of many buildings and constructions.The dynamic response of soil tunnel under the explosion action is analyzed,and therefore a reference foundation for antiknock design of tunnel is presented.
引文
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[2]凌贤长,胡庆立,欧进萍,等.土-结爆炸冲击相互作用模爆试验相似设计方法[J].岩土力学,2004,25(8):1249-1253.
[3]李忠献,田力.地下爆炸波作用下基底滑移隔展大跨结构的动力响应分析[J].计算力学学报,2005,22(4):457-564.
[4]李忠献,刘杨,田力.单侧隧道内爆炸荷载作用下双线地铁隧道的动力响应与抗爆分析[J].北京工业大学学报,2006,32(2):173-181.
[5]李忠献,刘志侠,丁阳.爆炸荷载作用下钢结构的动力响应与破坏模式[J].建筑结构学报,2008,49(4):106-111.
[6]杜修力,廖维张,田志敏,等.炸药爆炸作用下地下结构的动力响应分析[J].爆炸与冲击,2006,26(5):474-480.
[7]Daniel J L,Krauthammer T.Assessment of numerical simulationcapabilities for medium 2 structure interaction systems underexplosive loads[J].Computers and Struc-tures,1997,63(5):875-887.
[8]国胜兵,王明洋,赵跃堂,等.爆炸地震波作用下地下结构动力响应数值分析[J].世界地震工程,2004,20(4):137-142.
[9]田力,李忠献,郝洪.双线隧道中单侧隧道内爆炸引起地面建筑的动力响应及滑移隔震研究[J].工程力学,2008,25(8):133-138.
[10]Syrunin M A,Fedorenko A G,Ivanov A G.Dynamic Strength ofFiber Glass Shell[J].Journal of Physics,1997,7(3):517-521.
[11]刘建民,陈文涛.爆炸荷载下埋地管道动力响应分析研究[J].工程爆破,2008,14(2):20-25.
[12]申祖武,龚敏,王天运,等.爆炸冲击波作用下建筑结构动力特性的数值模拟与试验[J].武汉理工大学学报,2009,31(2):104-106.
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