중첩 모델링을 통한 발파진동의 특성에 관한 연구

Abstract

To analyze vibration measurement through vibration level is very important the decision of charge weight per delay. Though the identical charge weight per delay, it is big widely increased and decreased according to a condition of free-face, an initiating method of detonator and a condition of in-situ rock. Therefore to examine a calculation of accurate charge weight per delay and increase and decrease cause of vibration is demanded the waveform analysis and the frequency analysis. On this study, the two vibration waveform of the single hole which is not interfered from the different blasting holes is separated, the each dominant frequency which is determinated through the Fast Fourier Transform(FFT) is measured with 164Hz and 79Hz. Also the separation waveform executed a superposition modeling which changes to delay time from 1ms to 80ms in 1ms interval and controls the number of blasting holes from 2 holes to 15 holes in order to investigate the effect of PPV according to the duration time of the vibration and the number of blasting holes. As a result of analysis, the longer the duration time of the vibration, the longer the delay time which is not interfered from the different blasting holes and the effect regarding the number of blasting holes from inside identical delay time did not appear a lot. As a result of comparison with the delay time theory of Langefors, the amplification of the vibration appeared small from the delay time of 0.5, 1.5, 2.5, the amplification of the vibration appeared large from the delay time of 1, 2, 3, and the amplification of the vibration hardly ever appeared from the delay time which exceeds 3.