Study On Rational Delay Time Base On Superposition Method Of Blast Vibration Signal

In mining, the blasting vibration may cause some harm to build (structures), facilities and personnel, how to reduce the blasting vibration is a security issue has been closely watched in mine. Among, based on the Interference reduction method of millisecond blasting can get better vibration reduction effect, is an economical, convenient and practical method.Key of Interference reduction vibration method is to choose a reasonable delay time, though scholars put forward a set of principles and methods for determining delay time, but the results for the different blasting conditions obtained by different methods of calculation is often quite different. In this paper, using MATLAB’s data processing functions, superposition of single blasting vibration waveform under millisecond intervals was made to study the velocity and frequency characteristics in different delay time, and studied the energy distribution in different millisecond intervals. The results show that:the maximum decreasing of velocity really not appear in 1/2 cycle of the blasting vibration waveform signals; Superimposed signal’s frequency is also lower where its velocity weakened maximum, the greater harm likely to produce the building; energy distribution of superimposed signals is regularity with the millisecond interval prolongation, we can try to study reasonable delay time of vibration reduction of interference from the energy point.