减震沟对爆破地震波能量特性影响试验研究
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摘要
在减震沟两侧相邻区域内布设五个测点,对爆破震动试验展开监测。采用小波包能量谱分析法对采集的爆破振动信号进行分析,得到地震波经过减震沟的能量变化情况及各个测点的能量分布。试验与分析结果表明,减震沟对爆破地震波能量具有有效的衰减作用,但在沟后一定距离上存在能量放大现象;减震沟对初始能量主要分布在中高频的信号具有降频作用,对初始能量主要分布在低频的信号具有升频作用。
A blasting vibration test was monitored by laying 5 measurement points at both sides nearby a damping ditch.The collected signals were inspected with the method of wavelet packet energy spectrum analysis.The energy variation of blasting seismic wave and the energy distribution at each measurement point were obtained.The results of test and analysis show that the energy of blasting seismic wave is effectively attenuated by the damping ditch,whereas energy magnification appears at a certain distance behind the damping ditch.The damping ditch decreases the frequency bands of the signal whose original energy is distributed in high or intermediate frequency bands,and increases the frequency bands of the signal whose original energy is distributed in low frequency bands.
A blasting vibration test was monitored by laying 5 measurement points at both sides nearby a damping ditch.The collected signals were inspected with the method of wavelet packet energy spectrum analysis.The energy variation of blasting seismic wave and the energy distribution at each measurement point were obtained.The results of test and analysis show that the energy of blasting seismic wave is effectively attenuated by the damping ditch,whereas energy magnification appears at a certain distance behind the damping ditch.The damping ditch decreases the frequency bands of the signal whose original energy is distributed in high or intermediate frequency bands,and increases the frequency bands of the signal whose original energy is distributed in low frequency bands.
引文
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[2]易长平,陈明,卢文波,等.减震沟减震的数值模拟[J].武汉大学学报,2005,38(1):49-51.
[3]方向,高振儒,龙源,等.减震沟对爆破震动减震效果的实验研究[J].工程爆破,2002,8(4):20-23.
[4]Hagimori K.Low vibration blasting methods with continuousslots[A].Proceedings of the Japan Society of CivilEngineers,1988:142-150.
[5]娄建武,龙源,周翔,等.爆炸波传播的沟槽效应及分析[J].矿冶工程,2004,24(1):11-15.
[6]郭学彬,肖正学,张志呈,等.爆破地震作用的沟槽效应[J].爆破器材,1999,28(3):4-7.
[7]梁开水,陈天珠,易长平.减震沟减震效果的数值模拟研究[J].爆破,2006,23(3):18-21.
[8]郭涛,高振儒,范磊,等.不同位置条件下减震沟减震效应的数值模拟[J].爆破器材,2010,39(2):7-9.
[9]孙洁娣,靳世久.基于小波包能量及高阶谱的特征提取方法[J].天津大学学报,2010,43(6):562-566.
[10]张德丰.MATLAB小波分析[M].北京:机械工业出版社,2009.
[11]Oppenheim A V,Willsky A S,Nawab S H.刘树棠,译.信号与系统[M].西安:西安交通大学出版社,2004.
[12]周德廉,邵国友.现代测试技术与信号分析[M].徐州:中国矿业大学出版社,2005.
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