SPECTRUM COMPREHENSIVE ANALYSIS ON BLASTING SIGNALS UNDER DIFFERENT CUTTING METHODS

According to the principle of blasting damage, three kinds of cutting methods were designed, e.g., straight parallel hole cutting, single wedge cutting and double wedge cutting. Then, the blasting tests under different cutting methods were carried out in the field. The results show that all the three cutting methods can achieve good utilization ratio of blasting holes. The blasting effect of straight parallel hole cutting is good. The rock slag sizes of single wedge and double wedge cutting are uniform, which is beneficial to slag extraction. Moreover, the acceleration response spectrum, velocity response spectrum and displacement response spectrum of each cutting method were analyzed and compared separately. It is found that the straight parallel hole cutting have the maximum spectrum values among the three methods, and the spectrum mainly concentrates on the low-frequency part, while the double wedge hole cutting has the minimum spectrum values. It is obvious that the double wedge hole cutting is most suitable for the excavation system. It should be noticed that these spectrums calculated and obtained by blasting vibration monitoring are not the same as the vibration wave, which is a link between blasting vibration itself and dynamic response of the system. This study will provide a reference for the calculation of maximum response and a theoretical background for the design of blasting parameters.