基于HHT方法对紧邻既有隧道爆破振动信号的分析

为了研究爆破振动对紧邻既有隧道的影响,以京张高铁地下车站3条紧邻平行隧道的爆破振动信号为基础,采用HHT方法分析小间距隧道爆破时在紧邻既有隧道迎爆侧洞壁处的振动信号,绘制出实测爆破振动波形的Hilbert谱、边际谱和瞬时能量图,并对其进行分析。结果表明,在此工程情况下,振幅最大的频率主要集中在40 Hz;掏槽孔处爆破振动能量最大,在后续施工过程中需针对性采取控爆措施。

Analysis of adjacent existing tunnel blasting vibration signal based on HHT method

In order to study the influence of blasting vibration on the adjacent tunnel, taking the blasting vibration signal at three holes of Beijing Zhang high-speed rail as an example, the follow-up signal analysis was carried out by HHT method.The HHT method is used to analyze the vibration signals generated by the blasting near the existing side of a tunnel with small spacing blasting, and the Hilbert spectrum, marginal spectrum and instantaneous energy of the measured blasting vibration waveform are plotted. The results show that, the frequency with the largest amplitude is mainly concentrated in 40 HZ, the blasting vibration energy at the cutting hole is the largest under this blasting method, and the protection should be focused during the subsequent construction.