爆炸载荷下岩石损伤与能量耗散的数值分析  

Numerical Analysis of Damage and Energy Dissipation in Rock Under Blast Loading

作　　者：夏昌敬[1] 鞠杨[1] 谢和平[1] 

机构地区：[1]中国矿业大学岩石混凝土破坏力学重点实验室,力学与建筑工程学院北京100083

出　　处：《弹道学报》2006年第3期1-4,13,共5页Journal of Ballistics

基　　金：国家973基金项目(2002CB412705);国家自然科学基金创新群体基金项目(50221402);北京市教委科委重点实验室基金项目(SYS102900438)

摘　　要：通过与相关文献的实验结果对比,验证了数值模拟爆炸波在岩石介质中传播的可行性.借助于显式非线性动力分析有限元程序LS-DYNA,数值分析了爆炸波传播后岩石中损伤演化和能量耗散特性.数值计算结果表明,在爆炸荷载作用下,岩石可分为3个区:与炸药相邻D为1的破碎区,0<D<1的损伤区,D近似为0的弹性区,得出各区的范围;爆炸波输入岩石的大部分能量用于破碎岩石,弹性波携带能量占很少一部分;岩杆中能量密度峰值随距离以指数形式衰减.Compared with experimental results from references, the feasibility of the numerical simulation of blast wave diffusing in rock was proved. On the basis of numerical program LS-DYNA, damage evolution and property of energy dissipation in rock were analyzed after diffusion of blast wave. The numerical results show that under blast loading, there exist three zones in rock： crushed zone near the explosive （D=I）, damaged zone （0〈D〈1） and elastic zone （D≈0）. The range of each zone was obtained. Most input energy of explosive waves is consumed to crush rock. The energy of elastic wave occupies only a fraction. The peak value of energy density of rock attenuates exponentially with distance.

关 键 词：爆炸栽荷 岩石 数值模拟 损伤演化 能量耗散 

分 类 号：O381[理学—流体力学] TU458.3[理学—力学]