隧道爆破振动波形预测方法的构建及应用OA北大核心

Based on the vibration waveform function of a single-hole cylindrical charge and Blair's nonlinear super-position theory,a prediction method for vibration waveform of a group of holes in the millisecond delay blasting was con-structed using regression analysis,taking into account the influence of the free surfaces on the peak vibration velocity.The method was applied to optimize the delay time between tunnel blasting segments.Results show that,compared with the measured waveform,the predicted vibration waveform in the millisecond delay blasting of the group holes has the same number of peaks and vibration duration,the relative error of peak vibration velocity is less than 10%,the spectrum shape is similar,and the energy distribution law is the same.In engineering applications,when the delay time is 10 ms and 20 ms,the superposition of peaks will occur,resulting in an increase in vibration velocity.When the delay time is 40 ms and 50 ms,the waveforms of each segment are basically not superimposed.When the delay time is 30 ms,vibration control and blasting outcomes are optimal.The established method for predicting blasting vibration waveforms can be applied to optimize the delay time in tunnel blasting engineering.