Application and Research on Slight Vibration Controlled Blasting Technology for Metro Tunnel Adjacent Intermediate High Pressure Gas Pipe

摘要

According to the blasting construction for Shenzhen City Rail Transit the 1 lth line of Fuyong station～Qiaotou Metro tunneling interval tunnel adjacent intermediate high pressure gas pipe(1.6 MPa),Optimization of blasting parameters can control blasting vibration velocity,which ensure the safety of high pressure gas pipe and reduce the cost of construction,at the same time the preference can be provided for the similar projects.Through the practice of construction,the controlled blasting technology of digital electronic detonator and millisecond delay electric detonator that are assembled in use of cutting and smooth blasting are used in the construction of Metro tunneling interval tunnel adjacent high pressure gas pipe,it provides good effect; the result of analysis about blasting monitoring shows that the largest blasting vibration velocity and main vibration frequency are in the permission scope.Using the initiation mode,blasting parameters are reasonable,the maximum charge per interval is suitable and it can reduce the blasting vibration velocity and comply with the control requirements of high pressure gas pipe,make good economic benefits.