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以地铁隧道爆破施工为背景工程,通过监测隧道爆源正上方地表的振动,研究了隧道爆破振动波特性与爆破参数的关系,并分析了爆破振动波形各频带能量分布规律。通过研究分析,得出以下结论:(1)隧道掘进毫秒延期爆破,各段位爆破震动衰减规律各不相同,相对于k和α的修正方法,采用一个药量折减系数对单段药量进行修正更简便、更科学;(2)药量折减系数与最小抵抗线、临空面面积相关,其大小随着最小抵抗线的减小而减小,随着临空面面积的增大而减小;(3)运用Fourier变换得到振动波的频谱图,运用小波变换将振动波分解为若干频带,并绘制各频带能量分布图,两者结合更有利于分析振动波的优势频率,为减震、抗震提供依据。
Taking subway tunnel blasting construction as the background project, the relationship between blasting vibration wave characteristics and blasting parameters was studied by monitoring the vibration of the ground surface directly above the tunnel explosion source. The energy distribution rules of blasting vibration wavebands were analyzed. Through the research and analysis, the following conclusions can be drawn: (1) Millisecond delay blasting in tunnel excavation has different decrement rules of blasting vibration in each section. Compared with the correction method of k and α, a dose reduction coefficient is adopted for single- The correction is simpler and more scientific. (2) The dose reduction coefficient is related to the minimum resistance line and the freeboard area, and decreases with the decrease of the minimum resistance line. As the freeboard area increases (3) Fourier transform is used to obtain the spectrum of the vibration wave, the wavelet transform is used to decompose the vibration wave into several frequency bands, and the energy distribution of each band is plotted. Combining the two is more advantageous for analyzing the dominant frequency of the vibration wave, Earthquake, earthquake provide the basis.