爆心距对爆破震动信号频谱的影响分析
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摘要
结合临沂某一隧洞工程,利用matlab分析软件分析了不同爆心距下的爆破震动信号的频谱变化情况。得出:在爆破中近区,震动信号的主频在垂直方向的分量较水平方向大,随着爆心距的增加地面震动峰值速度的主震方向会由水平方向向垂直方向转化,总体呈衰减趋势,震动主频趋向于低频;在爆破参数和爆区特征类似于本工程的工程爆破现场其中低频震动信号在水平方向上的分量所占能量比例高于垂直分量的能量比例,在距爆源较远的位置也不能忽略爆破震动对建筑结构的影响,尤其是要加强水平方向的抗震设防。
Combined with a Tunnel Engineering in Linyi City, the spectrum changing situation of vibration signal at different distances from explosive source was analyzed through the analysis software MATLAB. It can be obtained that, in the medium and near-field of blasting source, the vertical component of the dominant frequency of vibration signal is larger than that in horizontal direction and the main vibration direction of ground vibration's peak velocity may change from horizontal direction to vertical direction with the increase of the distance from explosive source,and the overall trend decreases with vibration dominant frequency tending to low frequency. In engineering blasting site similar to this engineering in blasting parameters and features of the blasting region, the energy proportion of the horizontal component of vibration signal with low frequency is higher than that of the vertical component, and the impact of blasting vibration on building structures also can not be neglected even at the position far from the blasting source; in particular, seismic fortification in horizontal direction should be enhanced.
Combined with a Tunnel Engineering in Linyi City, the spectrum changing situation of vibration signal at different distances from explosive source was analyzed through the analysis software MATLAB. It can be obtained that, in the medium and near-field of blasting source, the vertical component of the dominant frequency of vibration signal is larger than that in horizontal direction and the main vibration direction of ground vibration's peak velocity may change from horizontal direction to vertical direction with the increase of the distance from explosive source,and the overall trend decreases with vibration dominant frequency tending to low frequency. In engineering blasting site similar to this engineering in blasting parameters and features of the blasting region, the energy proportion of the horizontal component of vibration signal with low frequency is higher than that of the vertical component, and the impact of blasting vibration on building structures also can not be neglected even at the position far from the blasting source; in particular, seismic fortification in horizontal direction should be enhanced.
引文
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[4] 张奇,白春华,刘庆明.保证地震波频谱特性研究[J].北京理工大学学报,1999(6) :306-308．
[5] 宋光明.基于小波包分析的爆破振动危害评价初探[J].安全与环境学报,2002(8) :23-27．
[6] 程康,徐学勇.爆破振动频率对振动效应影响的试验研究[J].爆破,2003,20(3) :79-81．
[7] 杨桂桐.岩体的动力特性及震动波在岩体中的传播[J].金属矿山,1992,(6) :33-38．
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