Numerical Simulation on Damage and Failure of Metro Structure under Penetration and Explosion Effects
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摘要: 以济南轨道交通7号线“水屯北路站”为例，基于LS-DYNA软件中的流-固耦合和完全重启动算法，开展了地铁结构由外及内的钻地弹先侵彻后爆炸以及由内及外的大当量TNT装药内部爆炸作用下结构毁伤破坏效应的数值模拟。首先，对已有弹体先侵彻后爆炸一次打击试验进行了数值模拟，验证了数值建模方法和材料模型参数选取的准确性。在此基础上，建立了3种由外及内的先侵彻后爆炸和3种由内及外的内爆炸三维数值模型，分析了地铁结构损伤破坏模式和对人员及附属构件的毁伤情况。数值模拟结果表明：钻地弹在地铁站上方先侵彻后爆炸作用时，地铁结构的损伤破坏模式为局部损伤；地铁结构内部爆炸时，超压峰值在爆炸近区衰减较快，在爆炸中远区衰减较慢。研究结果可为进一步探究内爆炸作用下地铁结构径向和法向冲击波传播衰减规律提供参考。Abstract: Taking Shuitun North Road Station of Jinan Rail Transit Line 7 as an example, a numerical simulation study was conducted to investigate the structural damage and failure effects of the metro structure based on the fluid-structure couple and full restart algorithm in LS-DYNA software. This study focused on two scenaries: projectile penetration followed by an explosion from outside to inside, and the inner explosion of a large equivalent TNT charge. Firstly, the accuracy of the numerical simulation and the selection of material model parameters were validated through the penetration followed by explosion test. Then, three cases of two-dimensional numerical model for penetration followed by explosion from outside to inside and three cases of three-dimensional numerical models for internal explosion were established. The damage mode of the metro structure and the damage condition for personnel and auxiliary components were analyzed. The simulation results demonstrate that the failure mode of the metro structure subjected to projectile penetration followed by explosion was localized damage. When the explosion occurs inside the metro structure, the peak of overpressure decays faster in the area close to explosion and slower in the middle and far area of the explosion. The present research results can provide a reference for further studies on the radial and normal shock wave propagation attenuation laws of the metro structure subjected to internal explosion.
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Key words:
- penetration /
- explosion /
- metro structure /
- damage and failure
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图 1 济南水屯北路站示意图 （单位：mm）
Figure 1. Schematic diagram of Jinan Shuitun North Road Station (Unit: mm)
图 8 数值模拟预测的侵彻后靶体的损伤破坏
Figure 8. Numerical prediction for damage of the target after penetration
图 9 数值模拟预测的爆炸后靶体的损伤破坏
Figure 9. Numerical prediction for damage of the target after explosion
图 10 数值预测的爆炸后的压力时程曲线
Figure 10. Pressure-time history curves after explosion by numerical prediction
图 11 数值预测3种工况侵彻后的损伤云图
Figure 11. Damage nephograms after penetration by numerical prediction of three cases
图 12 工况1的侵彻深度、侵彻速度及弹体加速度时程曲线
Figure 12. Time-dependent curves of penetration depth, penetration velocity, and projectile acceleration in Case 1
图 13 工况2的侵彻深度、侵彻速度及弹体加速度时程曲线
Figure 13. Time-dependent curves of penetration depth, penetration velocity, and projectile acceleration in Case 2
图 14 工况3的侵彻深度、侵彻速度及弹体加速度时程曲线
Figure 14. Time-dependent curves of penetration depth, penetration velocity, and projectile acceleration in Case 3
图 15 数值预测的工况1爆炸后地铁结构损伤
Figure 15. Damage of metro structure after explosion by numerical prediction in Case 1
图 16 数值预测的工况1爆炸后地铁结构上压力分布
Figure 16. Pressure distribution on the metro structure subjected to the explosion by numerical prediction in Case 1
图 17 济南水屯北路站三维示意图
Figure 17. Three-dimensional diagram of Jinan Shuitun North Road Station
图 18 爆炸作用下地铁结构的有限元模型
Figure 18. Finite element model of metro structure subjected to blast
图 19 数值预测的爆炸作用下地铁结构的损伤分布
Figure 19. Damage distribution of metro structure under explosion by numerical prediction
图 20 数值预测的爆炸作用下地铁结构的压力分布
Figure 20. Pressure distribution of metro structure under explosion by numerical prediction
图 21 爆炸作用下地铁结构内部测点位置与压力峰值
Figure 21. Measuring points and peak pressure inside the metro structure subjected to blast
表 1 爆炸作用下地铁结构内部压力传播过程
Table 1. Pressure propagation process in metro structure under explosion
Time/ms Case A Case B Case C 0.17 
0.64 
1.22 
1.90 
2.67 
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