A calculation method of electronic detonator delay time for high and steep slope millisecond blasting
The large-scale blast constructions are often required during the excavation of high and steep slopes,and it is particularly important to control the damage of blasting vibration to surrounding structures.Based on the synthetic principle of blasting vibration waveform,this paper studies the superposition law of vibration waveform with different delay time,and proposes an accurate calculation method of delay time between holes suitable for high and steep slope excavation with millisecond blasting.Additionally,the method is verified by field experiments.The results indicate that the method can accurately predict the synthetic waveform of multi-hole blasting,and determine the optimal delay time between holes at a distance of 20 m from the blasting center,which makes the peak vibration velocity and blasting energy significantly reduced.In addition,because the interference effect of blasting vibration signal is obvious,the blasting vibration energy is concentrated to the high frequency band,which reduces the harm of low frequency energy to buildings.The research results are expected to play a guiding and reference role in related engineering work.
万方数据
维普
