Study On Control Blasting Technology And Control Blasting Scheme Of Shallow、Large-span Tunnel

With the rapid development of China’s railway and road construction, large-spansection tunnel project is also increasing. In large-span tunnel excavation,the impact ofblasting vibration on stability of surrounding buildings and surrounding rock becomeconcerned about the hot spots. Based on the actual site of construction conditions,develop a program of blasting、elect reasonable blasting parameters and to ensure thatthe blast effect is present urgent problems.This thesis taking GuanZiLing Tunnel of LanYu Project as background, to studyon control blasting technology and control blasting program of shallow、large-spantunnel,by theory and numerical simulation. Main contents and conclusions are asfollows:①Sum up the advantages and disadvantages of the rock blasting model,analysis the failure mechanism of rock blasting, and then explore rock breakingmechanism under the decouple charge and different modes detonation.②Comparative work point of large-span section construction technologyprogram, and measures to cope with.③Study on the vibration-damping blasting technique, the position and form ofcuthole, blasting equipment, charging structure and the maximum amount ofexplosive, detonating delay, circulation heading level and other controlled blastingtechnical parameters, and by the formula for the volume, come to conventionaldetonating blasting program and the new optical "LongXin number1" digitalelectronic detonator blasting scheme of the large-span section GuanZiLing Tunnel.④ANSYS/LSDYNA procedure to establish finite element model, and use theempirical formula to simplify the blasting load of peripheral eye, to simulate theconventional blasting and a new optical electric blasting.⑤Analysis of simulation results, it is found that the maximum effect occurs onthe the tunnel wall facing the blasting side, and new optical digital electronicdetonator is recommend as blasting scheme of the large-span section GuanZiLingTunnel, and it is also found that reduce the maximum single-section amount ofblasting cartridges can reduce the vibration velocity.⑥Analysis of parameters and acquisition principle of the Blasting testequipment, sum up the arrangement principle of the test point,developed a vibrationmonitoring program, provides a measuring point data analysis methods.