| Summary: | 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.
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