【摘要】 在渝怀二线漾头越行站站改工程爆源附近火车站站房进行爆破振动试验。采用MATLAB对实测爆破振动信号进行基于db8小波基函数的7层小波包分解重构,并对重构后节点进行反应谱分析。结果表明:原始信号的主频位于优势频带范围内;随着节点编号的增大,峰值振速与能量同步变化,均呈先增大后减小的趋势;随着建筑物高度和传播距离增加,低频带能量所占比例上升,高频带能量所占比例下降。可采用高精度雷管精准控制炮孔延期时间,减轻爆破产生的低频振动叠加效应,分散能量在低频带上的分布,从而降低爆破振动对爆区内建筑结构的破坏。更多还原

【Abstract】 The blasting vibration test was carried out in the railway station building near the blasting source of Yangtou row stand reconstruction project in Chongqing Huaihua second line. The measured blasting vibration signal was decomposed and reconstructed by 7-layer wavelet packet based on db8 wavelet basis function with MATLAB,and the response spectrum of reconstructed nodes was analyzed. The results show that the dominant frequency of the original signal is in the dominant frequency band. With the increase of node number,the peak vibration velocity and energy change synchronously,which first increase and then decrease. With the increase of building height and propagation distance,the proportion of low-frequency band energy increases,while the proportion of high-frequency band energy decreases. Using high-precision detonator to accurately control the delay time of blast hole can reduce the superposition effect of low-frequency vibration caused by blasting,disperse the distribution of energy in the low-frequency band,and reduce the damage of blasting vibration to the building structure in the blasting area.更多还原