摘要
为了进行坑道内爆炸防护的研究,采用有限元软件LS-DYNA对带拐角的坑道内爆炸效果进行数值模拟,计算结果和试验结果基本符合。研究了直坑道内平面爆炸波的形成过程,利用坑道顶部和底部压力平衡的方法,总结了坑道内平面爆炸波的形成规律。利用自由场空气爆炸波超压经验公式和总能量相似律,修正了计算坑道内爆炸波压力衰减规律的计算方法,新方法得到的结果和试验结果符合较好。对坑道内爆炸波的传播规律的研究可以为地下空间爆破施工安全以及地下工程的防护设计提供理论依据。
In order to study the blast protection for tunnels underground, blast in tunnels is simulated by LS- DYNA. The calculation results are well consistent with the tested results. The formation of the plane blast wave propagating in the tunnel is understood by way of pressure equilibrium at the bottom and top of the tunnel Based on the attenuation law of peak-overpressure in free air field and total energy equivalent law, an improved overpressure propagation law is presented. Comparison of the improved law with experimental data shows a favorable agreement. A study on propagation laws of blast in tunnels would provide theoretical foundation for the security of construction in underground environment and the protective design of understructure work.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第2期396-399,435,共5页
Chinese Journal of Underground Space and Engineering
关键词
爆炸力学
坑道
内爆
冲击波衰减
数值模拟
explosive dynamics
tunnel
inner blast
shock wave attenuation
numerical simulation
