The Application Of Digital Electronic Detonator Blast In The Subway Tunnel Vibration Reduction

In the current urban subway tunnel blasting vibration reduction measures are mainly toreduce the explosive charge and use low-energy low detonation velocity of explosives,most of which is to increase the detonator Dan, but by ordinary electric detonators andnon-electric detonators Dan and low accuracy limitations, damping effect produced is oftennot ideal. In this paper, the selected project is located in the city downtown, for dampinghigher, so use digital electronic detonator detonator on the basis of common experience,not only to maximize the reduction of the explosive charge, realized by hole initiation, butalso through changing room between the rows of holes and the extension of the intervalbetween the explosion source so that the shock wave interference stack, to achieve peakload shifting interference damping effect.First major study by an extension interval between when an electronic detonatorbetween the hole and the discharge and joint optimum blasting interval extension betweenthe explosion source, the main method is to study the vibration and different hole blastingblasting explosion sources were alone when waveform analysis of its maximum peak,trough vibration cycle, the optimum extension between its holes and the interval betweenthe explosion source. In the all-electronic detonator tests take between slots and digbetween rows extension3ms, among the other hole extension7ms success, on this basis,consider the cost and feasibility of the use of digital electronic detonator+Nonel time inthe mid-in the form of detonators, delay time between cut holes between the rows of holesfor the same2ma, Pai7ms, detonator by MS1~MS15segment also made good use of thejump damping effect.In the United blasting (up, down stairs joint blasting, joint inter-tunnel blasting) As aresult of gun zone are electronic detonators, with its characteristic delay time can be set,after not of the experiment showed that the current level in three different Dan Charge timeextension interval between steps are:16ms,32ms,76ms. Joint tunneling blasting interval extension of33ms. Due to the current non-electronic detonators experience combined withblasting parameters extension of time, so constantly optimize its deferred intervals andparameters as waveforms were blasting each explosion sources, to improve the blastingvibration effect is important.