Abstract: Changhongling tunnel on ChongqingLichuan railway crosses underneath Jiangchi town. In the construction of the towncrossing section of the tunnel, vibrationminimizing blasting tests are performed by using electronic detonators. The mentioned tests are carried out under the guidance of interference vibrationminimizing theory. The vibrationminimizing blasting is monitored, and the blasting parameters are optimized. Fullface vibrationminimizing blasting technology with electronic detonators, which achieves less than 1.0cm/s blasting vibration velocity under the condition of about 30m distance, is established. In the end, the blasting vibration velocity is reduced, the safety of the surface buildings is guaranteed, the primary support of the tunnel is reduced and the construction efficiency is improved.

Key words: Changhongling tunnel, tunneling underneath surface buildings, electronic detonator, vibration monitoring, vibrationminimizing blasting 