爆炸荷载作用下饱和土体的液化特性分析  

Analysis of liquefaction properties of saturated soil under explosive load

作　　者：张智超[1] 刘汉龙[1,2] 刘军[1] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《解放军理工大学学报（自然科学版）》2012年第4期419-424,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50909040);国家杰出青年科学基金资助项目(50825901);水利部公益性行业专项经费资助项目(200801014)

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。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.

关 键 词：爆炸荷载 饱和土体 液化 数值模拟 孔隙水压力 

分 类 号：TU435[建筑科学—岩土工程]