Abstract：In order to analyze the impact of shallow-buried and small clear distance tunnel blasting on the ground surface and the vibration of the adjacent excavated tunnel, an on-site blasting vibration monitoring experiment was carried out. And the vibration characteristics and changes of the ground surface and the side wall of the preceding excavated tunnel induced by the typical segment blasting were obtained. The results showed that: on the ground surface and the excavated tunnel, the vibration velocity measured at a symmetrical position within 25m in front and back of the blasting surface, the particle velocity in front is greater than the rear, but the vibration velocity of each point at the rear decays faster than the front. The vertical velocity component of the vibration velocity at each measuring point on the ground surface is the largest, and the tangential direction is similar to the radial direction. The vertical component is the largest, which is 1.5-4.0 times of the tangential and radial directions-the cut and expansion blasting is greatly affected by the rock clamp, which causes relatively high vibration velocity of the ground surface and the excavated tunnel, and the auxiliary and surrounding charge section blasting is small. According to the national “Blasting Safety Regulations”, the vulnerable positions of the tunnel are also analyzed. This research work can provide a reference for blasting excavation and vibration control in similar tunnels.
