【摘要】 采用LS-DYNA软件对含不同密度聚苯乙烯泡沫(EPS)颗粒夹层的隧道结构进行了抗爆性能研究。通过对不同点的压强结果进行分析表明:EPS颗粒夹层对应力波的衰减起到很好的作用;压强衰减率随EPS颗粒密度的增加而增加;同时EPS颗粒夹层能降低由隧道自由面冲击波反射产生的拉应力。建立了与EPS颗粒密度和相对距离相关的压强衰减率的数学模型。更多还原

【Abstract】 In order to analyze the properties of tunnel constructions including EPS granular against blast loading,LSDYNA is employed to study the anti-explosion effect of embedded EPS geofoam of different density in tunnel constructions. The results of hydrostatic pressure at different points show that the existence of EPS geofoam inclusions has important effects on the attenuation of stress-waves in tunnel constructions; with the increase of the density of EPS geofoam inclusions,the decay rate for the hydrostatic pressure increases monotonically; the EPS geofoam inclusions reduce the tension stress at the top of the tunnel. An empirical formula is proposed to correlate the decay rate with the density of geofoam inclusion and the relative distance.更多还原