内部爆炸作用下的花岗岩地下洞室损伤机理  

Damage Mechanism of Underground Chamber in Granite Under Inner Explosion

作　　者：熊益波[1,2] 王雷元 王万鹏[1,2] 王春明 崔云霄[1,2] 钟方平 XIONG Yi-bo;WANG Lei-yuan;WANG Wan-peng;WANG Chun-ming;CUI Yun-xiao;ZHONG Fang-ping(Northwest Institute of Nuclear Technology,Xi＇an 710024,China;Laboratory of Intense Dynamic Loading and Effect,Xi＇an 710024,China)

机构地区：[1]西北核技术研究所,西安710024 [2]强动载与效应实验室,西安710024

出　　处：《现代应用物理》2018年第3期57-62,共6页Modern Applied Physics

摘　　要：采用显式动力分析软件LS-DYNA,对内部近距离化爆作用下花岗岩洞室的损伤破坏过程进行了数值模拟,考虑了炸药-空气-结构之间的流固耦合作用以及花岗岩材料本构模型的高应变率、高静水压和损伤效应。结果表明,在内部近距离爆炸冲击作用下,该洞室围岩损伤具有时空特征与结构层次特征:首先,爆心截面附近岩石受压产生材料损伤,损伤范围随装药量的增加逐渐增大;其次,爆炸冲击波在洞室端部会聚,反射超压显著增大,引起该处岩石的材料压缩损伤;最后,随着洞室侧壁位移与端部位移的先后增大,在侧壁与端部交界处产生撕裂,在侧壁形成平行于轴向的裂缝,且随着药量的增加,两处裂缝将逐渐扩展、贯通,结构破坏风险随之增大。本工作可为硬岩中抗爆结构设计及相关工程建设提供借鉴与参考。The dynamics explicit program LS-DYNA is employed to simulate the damage process of closed chamber in granite under inner explosion. The numerical model involves the coupled interactions of explosive-air-structure, as well as the effects of high strain rate, high pressure, and damage embodied in the constitutive model of granite. The results show that the damage of granite chamber represents space-time features and structure gradations. Firstly, the material damage in compression emerges at and near the section of detonation, and becomes serious with the increase of the charge mass.Then, the explosion waves converge and dramatically enlarge the reflected pressures at the end of the chamber, where the compressive damage is generated. Finally, as the displacements increasing successively at the side face and the end face of the chamber, structural tearing crack may be initiated at the edge of the two faces, and another structural tensile cracks paralleled with the axial direction may be initiated at the side face, which will generate communicating cracks with the charge mass increasing, and then arise the risk of structural damage. This work may be regarded as the basement and can be used for such structural design or engineering construction in hard rock.

关 键 词：爆炸力学 损伤机理 花岗岩洞室 内部强爆炸 ALE2D 

分 类 号：O383[理学—流体力学] O347[理学—力学]