温压炸药爆炸作用下坑道衬砌动力响应研究
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摘要
利用ANSYS/LS-DYNA建立了岩土层内温压炸药爆炸作用下坑道衬砌的动力响应数值计算模型,通过流固耦合方法模拟了从炸药起爆到衬砌结构毁伤的全过程,并将毁伤情况与同药量TNT作用下的进行了对比;研究结果表明:相比TNT温压炸药威力更大毁伤区域更广,对坑道衬砌结构的毁伤效应更强,温压炸药作用下的衬砌内表面拱顶部竖向位移、关键部位有效应力、剪应力及钢筋轴向应力都较TNT有大幅增大,坑道衬砌结构有必要提高强度等级以抵御温压弹的侵彻打击。
The dynamic response numerical calculation model for tunnel lining under the action of thermobaric explosive exploding in the rock was established by ANSYS/LS-DYNA,and the whole process from exploding to the damage of tunnel lining was simulated by the fluid-solid coupling technique. The damage effect was compared with that of the same dose of TNT. The result shows that thermobaric explosives are more powerful than TNT and can cause more stronger damage effect to tunnel lining. The vertical displacement of vault,the effective stress and shear stress of lining are significantly increased under the action of thermobaric explosives while being compared with TNT,it's necessary to improve the strength degree of tunnel lining to resist the penetration against of thermobaric weapons.
The dynamic response numerical calculation model for tunnel lining under the action of thermobaric explosive exploding in the rock was established by ANSYS/LS-DYNA,and the whole process from exploding to the damage of tunnel lining was simulated by the fluid-solid coupling technique. The damage effect was compared with that of the same dose of TNT. The result shows that thermobaric explosives are more powerful than TNT and can cause more stronger damage effect to tunnel lining. The vertical displacement of vault,the effective stress and shear stress of lining are significantly increased under the action of thermobaric explosives while being compared with TNT,it's necessary to improve the strength degree of tunnel lining to resist the penetration against of thermobaric weapons.
引文
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[2] WALDEMAR A T,LOTFI M. Thermobaric and Enhanced Blast Explosives-Properties and Testing Methods[J]. Propellants Explosives Pyrotechnics,2015,40(5):632-644.
[3] WILDEGGER G A E. Aspects of Thermobaric Weaponry[J]. ADF Health,2003,4(1):3-6.
[4]卢艳君.制导系统的发展及精确制导技术[J].兵工自动化,2007,26(10):105-107.
[5] WANG J. Simulation of Landmine Explosion Using LS-Dyna3D Software:Benchmark Work of Simulation of Explosion in Soil and Air[R]. Weapons Systems Division,Aeronautical and Maritime Research Laboratory,2001.
[6] JAVIER T,RAFAEL R,ISIDRO D,et al. FEM Models Including Randomness and its Application to the Blasting Vibrations Prediction[J]. Computers&Geotechnics,2006,33(1):15-28.
[7]钱耀峰,王星华.爆破施工对邻近隧道安全的影响[J].北京交通大学学报,2014,38(4):90-96.
[8]蔡路军,朱方敏,吴亮,等.上穿公路隧道偶然爆炸对下方供水隧洞影响研究[J].地下空间与工程学报,2013,9(5):1197-1200.
[9]程选生,苏佳轩.爆炸作用下土体隧道衬砌结构的动力响应[J].应用力学学报,2012,29(1):104-108.
[10] LS-DYNA Keyword Uer’s Manual[M]. Livemore Software Technology Corporation(LSTC),2007.
[11] TELFORD T. CEB-FIP Model Code[M]. Comite Euro-International Du Beton,UK,1990.
[12]许铤.温压装药在有限空间的爆炸特性研究[D].南京:南京理工大学,2008.
[13] ANSYS Inc. Autodyn Explicit Software for Nonlinear Dynamics User Manual[M]. Pennsylvania,US,2005.