Abstract
This study aims to effectively control the effects of blast vibrations and improve the safety factor for personnel and facilities in blasting engineering. Using high-precision digital electronic detonators according to the propagation and superposition principle of blasting vibration signals, a superposition prediction method based on single-hole blasting vibration waveform is proposed to determine the group-hole blasting vibration waveform. Experimental results show that the variation law of the predicted blasting vibration wave is consistent with that of the measured blasting vibration wave, and the error rate is less than 16%. Based on the proposed superposition prediction method, the variation law of particle vibration velocity peak with micro-differences in time is studied. Consequently, an optimal differential time interval (delay time) is obtained with regard to the blasting vibration reduction. The results are applied in a site leveling project, and the results show that the slight time difference between zones has an evident effect on vibration reduction. The maximum reduction achieved with the proposed method is superior (69.7%) to that obtained via other controlled blasting delay methods. This result has been successfully applied in a flat project in China.
Highlights
Effective control of blasting vibration damage is one of the major problems in the field of engineering blasting that needs in-depth exploration (Deng and Chen, 2021)
This study introduces the concept of “vibration reduction rate” and determines the variation rule of the high-precision blasting vibration signal with micro-delay time, which is used to guide the selection of micro-delay time for reducing vibrations in subsequent blasting construction; this rule was verified using experiments
1) This study uses MATLAB for performing numerical simulations to predict the group-hole blasting vibration waveform through the single-hole blasting vibration waveform, which in turn consistently follows the variation law of the measured blasting vibration waveform
Summary
Effective control of blasting vibration damage is one of the major problems in the field of engineering blasting that needs in-depth exploration (Deng and Chen, 2021). Based on the principle of linear superposition of seismic waves, the delay interval of millisecond blasting with different core distances was calculated These studies have determined the delay associated with the vibration reduction differential time, they have limited the test site and geological conditions. When the delay time is 18 ms, the blasting vibration velocity peak value at each measuring point is lower than that at delay times of 22, 27, and 50 ms; this proves that the proposed superposition prediction method based on single-hole blasting vibrations adopted is consistent with the practical results. In areas at intermediate and higher distances from the blasting zone, the vibration reduction effect remains comparable with a change in the FIGURE 9 | Main frequency of each measuring point at different delay times. In a flat project in China, engineers and technicians performed blasting operations according to this method and selected several delay times to monitor vibrations in the project; they obtained the vibration reduction effect observed in this study, which proved that a delay time range of 16–20 ms is effective for vibration reduction
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