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中文摘要：
爆破地震波中的剪切波（S波）是爆破破坏建筑物的重要因素,研究S波的产生机制和传播特征具有重要意义。基于LS-DYNA的动力有限元计算,分别采用弹性均质模型、弹塑性损伤模型以及SPH-FEM耦合分析方法研究并验证了瞬时爆轰条件下柱状药包S波的形成机理。研究结果表明：弹性均质条件下,药包中截面上只有P波没有S波,在弹塑性损伤条件下有S波的产生,而SPH-FEM耦合分析方法中该现象更加明显,同时SPH-FEM工况下,P波、S波到达时间差更接近理论时间差,计算结果验证了P波在传播过程中遇岩石界面会产生S波,不同数值模拟方法可明显影响计算结果。研究成果可为S波的研究方法及形成机制提供参考。
英文摘要：
Shear wave （S-wave） in blast-induced waves is an important factor in destroying construction struc- tures. Investigating the generation mechanism and propagation characteristics of（S-wave） during blasting is crucial. Based on dynamic finite element calculation software（ LS-DYNA）, the elastic model coupled with elastic-plastic and SPH-FEM model were employed respectively to verify the generation mechanism of S-wave under instantaneous deto- nation condition. Results show that the only P-wave but no S-wave was found in the middle section of charge under e- lastic homogeneous condition,while S-wave was generated under elastic-plastic damage condition, which waas more obvious in SPH-FEM coupled analysis method. The arrival time difference between P-wave and S-wave was closer to theoretical results. The calculation valided the fact that S-wave would form when P-wave encounters rock interface in propagation process, and the results could be greatly influenced by different numerical simulation methods.
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