混凝土边坡模型微差爆破地震波反应谱分析

Response Spectrum Analysis of Millisecond Blasting Seismic Wave on Concrete Slope Model

为了研究不同爆破间隔时间对反应谱特征的影响,利用地震工程中广泛采用的反应谱理论对收集到的室内混凝土边坡爆破振动信号进行研究。首先,对实测的爆破振动信号进行微分得到加速度信号,并用小波包降噪法对加速度信号进行去噪处理。然后,采用Fourier变换方法求得了不同间隔时间下爆破振动信号的加速度反应谱和标准加速度反应谱。分析结果表明:不同间隔时间的爆破质点峰值速度与加速度反应谱的峰值并不存在对应关系;多段微差爆破在起到干扰降振的同时,也使得结构体出现共振的几率增加。

In order to study the influence of different interval time on response spectrum property of blasting vibration signals,the response spectrum theory largely used in earthquake engineering was applied to study the blasting vibration signals from the laboratory concrete slope. Firstly,by the differential method,the acceleration signal was obtained from the blasting vibration velocity signal,and de-noised the signal by wavelet packet. Then,the acceleration response spectrum and standard acceleration response spectrum with different interval time were given by Fourier.The results show no corresponding relationship between the particular peak velocity and acceleration response spectrum; the multi-deck reduced vibration by wave interference,while also increased the probability of sympathetic vibration in the structural response.