【摘要】 为了研究饱和土体在爆炸冲击荷载作用下的液化特性,在LS-DYNA软件框架内,建立了适合于爆炸荷载作用下土体动力分析的实用模型,并对某爆炸液化现场试验进行了数值模拟。模拟得到的孔压时程与试验结果基本一致,表明数值手段能够较好地预测土体在爆炸荷载作用下孔压的发展规律。同时,通过数值模拟结果还可以发现,爆炸荷载作用下土体可能发生液化的区域远大于爆炸直接冲击导致结构破坏的区域。因而,在防护结构设计中,不仅要考虑结构本身的强度是否满足抗爆设计的要求,还要考虑由于周围土体液化导致的地基失效而造成的结构失稳破坏。更多还原

【Abstract】 To study the liquefaction behavior of the saturated soil under explosive load,the constitutive model which can well describe the dynamic property of soil was proposed in the frame of LS-DYNA in this work,meanwhile,the simulation was implemented for some blast-induced liquefaction in-situ test.The simulated pore pressure time history is consistent with that of the test,which indicates that the numerical method can well predict the pore pressure development of soil under the explosive load.In addition,the numerical results also reveal that the potential liquefaction area of soil far exceeds the region within which the structure is damaged by the direct impact of the explosion.Therefore,both the strength of the structure and the possible collapse of the structure due to the failure of its foundation induced by the liquefaction of the surrounding soils should be taken into consideration in the design of protective structure.更多还原