地下坑道对其临界震塌爆距处钻地武器爆炸载荷的动力响应  

Dynamic response of underground tunnel to explosive loading from penetration weapons in the critical collapse distance

作　　者：冯慧平[1] 刘洪兵[1] 左兴[1] 惠浪浪 

机构地区：[1]西北工业大学力学与土木建筑学院,陕西西安710129

出　　处：《爆炸与冲击》2014年第5期539-546,共8页Explosion and Shock Waves

摘　　要：利用非线性显式动力有限元程序,采用多物质流固耦合计算方法,就GBU-28钻地弹在地下坑道临界震塌爆距处爆炸时,对地下直墙拱坑道的动力响应进行数值模拟。根据围岩动力稳定性和混凝土动态强度判据,结合模拟结果,分析衬砌结构与围岩的相互作用。钻地弹在直墙圆拱断面的坑道临界震塌爆距处爆炸时:围岩处于临界破坏状态,但混凝土衬砌结构处于稳定状态;拱顶的应力峰值明显,且柱状装药情况下,爆炸近区的应力较集团装药情况下的大;拱肩位置出现应力集中;围岩与衬砌结构特征位置处的相互作用载荷与对应质点的振动速度相互耦合,基本成对应的关系。Based on ANSYS/LS_DYNA, the multi-material fluid-solid coupling method was adopted to numerically simulate the dynamic responses of an underground straight-wall-arch tunnel to the pen- etration and explosion of a guided bomb GBU-28. The explosion of the guided bomb GBU-28 was ini tiated at the critical collapse distance of the straight-wall-arch tunnel. The criterions were obtained for evaluating the dynamic stability of the surrounding rock and the dynamic strength of the lining con- crete. The obtained criterions were used to analyze the simulated results and explore the interaction between the tunnel lining and the surrounding rock. When the guided bomb explodes at the critical collapse distance of the straight-wall-arch tunnel, the investigated results display the followings： （1） the surrounding rock is in the critical damage state, and the concrete lining is stable and safe; （2） the effective stress peak at the vault is obvious, and under the strip charge condition, the effective stress in the near field of the explosion is higher than that under the group charge condition; （3） the span- drel takes on a stress concentration phenomenon; （4） at the characteristic positions, the interaction pressures between the surrounding rock and the concrete lining are coupled with the vibration speeds of the particles.

关 键 词：爆炸力学 动力响应 多物质流固耦合 直墙拱坑道 混凝土衬砌 围岩 爆炸载荷 

分 类 号：O383.2[理学—流体力学]