常规爆炸下地下结构的冲击震动环境

Blast shock and vibration of underground structures with conventional weapon

为准确得到结构的爆炸地冲击参数,建立了爆腔岩土介质地下结构动力相互作用有限元分析模型,对常规爆炸下地下结构的冲击震动环境进行了描述。该模型将爆炸波在岩土中的自由场传播与遇到结构后产生的波反射、绕射、透射等现象相结合考虑。与传统方法相比,该计算模型的精度大幅度提高,结果误差由目前常用方法的200%左右减小到20%以下,对研究地下结构在冲击荷载下的隔震问题有重要意义。

Dynamic interactive geophysical finite element model for underground structures was developed to precisely analyze underground structures subjected to blast shocks. The dynamic parameters for the vibration environment are described in the method. The finite element model includes wave reflections, diffraction, and transmission when the shock wave eucounters the structure. The analytical results show that the 200% error in classical methods is reduced to 20% with this method. The method can be used to analyze isolation problems of underground structures subjected to blast loads.