爆炸载荷下地下钢管道-混凝土-围岩结构损伤效应数值模拟  

Numerical Simulation on Damage Effects of Underground Structure of Steel Pipeline-Concrete-Rock Under Explosive Loading

作　　者：熊益波[1] 彭璐[1] 王雷元[1] 王万鹏[1] 陈建华[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2014年第1期51-58,共8页Modern Applied Physics

摘　　要：采用LS-DYNA有限元软件对某地下钢管道-混凝土-围岩结构的抗爆炸冲击响应进行了数值模拟。对混凝土结构模拟采用Holmquist模型、Malvar模型和RHT模型;对花岗岩结构的模拟则根据实测数据拟合了Holmquist模型参数。理论分析比较了3个模型的特点,并结合实际工况要求得出结论:1)Holmquist模型和Malvar模型、RHT模型均能较好地模拟混凝土结构在爆炸载荷下的损伤效应,但Holmquist模型更适用于模拟压缩损伤,后两个模型模拟拉伸损伤更为合理;2)须根据实际工况和工程目标对各模型预测的损伤分布结果进行判定、取舍,获得更为准确信息;3)对混凝土材料性质未知或知之甚少的典型工况,可使用多个本构模型进行数值模拟对比分析,能够快速、全面地把握结构响应特征。A numerical simulation was performed with the code LS-DYNA on an under-ground steel pipeline-concrete-rock structure under explosive loading.The Holmquist mod-elthe Malvar model and the RHT model were employed respectively for the concrete struc-turewhile for the simulation of granite structurethe parameters of the Holmquist model were obtained from the test data.The computation results indicate that the damage distribu-tions predicted by the three models are very different from each otherwhich can hardly sat-isfy the requirements of the engineering design.We theoretically analyzed and compared the distinguishing features of the three modelsand got the following conclusions1All of the three models can well predict the damage effects of concrete structure under explosive load-ingbut the Holmquist model is adept at simulation of compressive damagewhile the other two are more rational in describing tensile damage2In order to obtain more exact informa-tionthe predicted results of damage distribution with the three models should be determined according to the practical circumstances and proj ect obj ectives3In the case that the con-crete material is uncharacterized or little information about the concrete material is availablemultiple concrete constitutive models such as the simple input models are more helpful.

关 键 词：固体力学 损伤效应 数值模拟 地下结构 本构模型 混凝土 

分 类 号：O347[理学—固体力学] O38[理学—力学]