【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。更多还原

【Abstract】 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.更多还原