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| Probability analysis for influence of time-delay error of detonators on superposed seismic wave vibration reduction |
| HAN Liang1， LI Hongjiang2， LIU Dianshu3， LING Tianlong3， LI Chen3， LIANG Shufeng3 |
1.College of Safety Engineering, North China Institute of Science and Technology, Beijing 101601, China;
2.College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;
3.School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China |
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Abstract Based on measured single-hole waveforms at points with different distances, vibration velocity amplitude variations of superposed signals with variation of distance were obtained by using the method of 1ms equal interval double-segment superposition, and the optimal delay time at each measured point was determined.Considering time-delay error of detonators, a probability model was established to quantitatively analyze influence of time-delay error of detonators on seismic wave interference vibration reduction.The results showed that at the measured point with near distance, low segment location detonator has a larger vibration reduction probability, while at the measured point with far distance, high segment location detonator has a larger vibration reduction probability; the distance of the measured point more largely affects the vibration reduction probability of low segment location detonator, but it affects that of high segment location detonator less; in the actual blasting design, the detonator segment number at the blast source can be chosen optimally according to the allowable maximum vibration velocity at different measured points to provide a useful reference for the blasting design.
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Received: 05 June 2018
Published: 28 January 2019
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