Research on blasting control technology for blast in shallow tunnel crossing existing buildings

摘要

Based on the JIAOZHOU bay subsea tunnel in QINGDAO city, with the experimental equation of charge establishment and coherent code, the blasting control technology for blast in shallow tunnel crossing existing buildings of JIAOZHOU bay subsea tunnel is studied. According to a large number of tunnel construction field test data while blasting and the method of regression Analysis, the vibration wave propagation and the calculation parameters of charge quantity is obtained, then calculating the maximum allowable amount of primary explosive segment. Finally the blasting program is optimized. Based on the above methods, house maximum blasting velocity is controlled under 2cm/s. According to the test results of different floors of the building blasting vibration velocity, the velocity of the first floor is greater than the velocity on each floor, so, the velocity of the first floor is recommended to be the control velocity while the maximum charge quantity is calculated. This study is not only useful to ensure the building's stabilization when blasting in JIAOZHOU bay subsea tunnel but also offers the theoretical and methodological experiences to the similar engineering.