【摘要】 本文采用基于μ-CMOS传感器技术的超高速摄像机,通过对药包以及同步控制器触发能量的设计,实现了多炮眼同步加载,完善了超高速DIC实验系统。在此基础上开展了模型实验,获得了近距侧爆破地铁隧道应变场的分布特征。实验结果表明:同侧炮眼爆破与邻近隧道应变波传播特征、炮眼边界条件相关;不同位置炮眼爆破产生的应变波对于隧道周围特征点的作用不同;其压应变峰值高低比相差超过4.5倍;邻近隧道一侧爆破应力集中部位依次是迎爆侧直墙、拱腰交汇处、隧道拱顶、底板中心处。更多还原

【Abstract】 In this paper,based on μ-CMOS sensor technology,the ultra-high-speed camera is used.Through design triggering energy of the drug packet and the synchronous controller are designed,The simultaneous loading of multiple shots in ultra-high speed DIC experimental system is developed. A model experiment is carried out and the distribution characteristics of the strain field in the metro tunnel near the side burst are obtained. The experimental results show that the propagation characteristics of the strain wave in the adjacent tunnel are related to the boundary conditions of the blasting tunnel. The effect of the blasting blasting at different positions on the characteristic points around the tunnel is different. The difference between higher and lower peak compressive strain is more than 4. 5 times. The blasting stress concentrated area of the side close to tunnel is followed by the blast side of the straight wall,arched waist interchange,tunnel vault and floor center.更多还原