炸药性能对地震波品质影响的Hilbert-Huang变换分析
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摘要
为检测爆炸地震波的品质(能量,主频),探寻激发高能量、高频率地震波的炸药震源,选用梯恩梯(TNT)、梯铝(TL)、8701,黑火药(BP)进行浅埋土中爆炸试验.并利用Hilbert-Huang变换(HHT)对距离震源10~65m处地面振动速度信号进行分析,结果表明:高能量高爆速炸药8701震源激发的地震波能量大,但频带较窄,主频较低,高频率段能量随传播距离衰减较快;低能量低爆速炸药BP激发的地震波频带较宽,主频也较高,但地震波能量过低;含铝炸药TL激发的地震波能量大,且随传播距离衰减速度较慢,主频介于黑火药BP与炸药8701之间.
To test the quality(energy,frequency,frequency band width)of seismic wave,as well as explore the explosive source that can generate seismic waves with high energy and frequency,a field test in sandy soil was carried out using TNT,aluminum ladder(AL),8701 and black powder(BP).Vibration signals of the ground surface at a distance from 10~65m were recorded and analyzed by Hilbert-Huang transform(HHT).The results showed that the seismic wave generated by 8701 with high energy and detonation velocity owns large energy,but accompany with a narrow frequency band and low predominant frequency,and its energy in high frequency region get attenuation rapidly along with the propagation distance;BP with low power and low detonation velocity explosive generates a wide frequency band wave,however,it is short of energy.Then,high power and low detonation velocity explosive——TL stimulates seismic wave with large energy and wide frequency band,and its dominant frequency is between that of BP and8701.
To test the quality(energy,frequency,frequency band width)of seismic wave,as well as explore the explosive source that can generate seismic waves with high energy and frequency,a field test in sandy soil was carried out using TNT,aluminum ladder(AL),8701 and black powder(BP).Vibration signals of the ground surface at a distance from 10~65m were recorded and analyzed by Hilbert-Huang transform(HHT).The results showed that the seismic wave generated by 8701 with high energy and detonation velocity owns large energy,but accompany with a narrow frequency band and low predominant frequency,and its energy in high frequency region get attenuation rapidly along with the propagation distance;BP with low power and low detonation velocity explosive generates a wide frequency band wave,however,it is short of energy.Then,high power and low detonation velocity explosive——TL stimulates seismic wave with large energy and wide frequency band,and its dominant frequency is between that of BP and8701.
引文
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[2]Ma G W,Hao H,Zhou Y X.Modeling of wave propagation induced by underground explosion[J].Computers and Geotechnics,1998,22:283-303.
[3]Henrych J.The dynamics of explosion and its use[M].Xiong Jianguo,transl.Beijing:Science Press,1987.
[4]Sanchidrian J A,Segarra P,Lopez L M.Energy components in rock blasting[J].International Journal of Rock Mechanics&Mining Sciences,2007,44:130-147.
[5]廖振鹏.空腔爆炸产生的地震波[J].地球物理学报,1976,19(1):50-63.Liao Zhenpeng.Seismic waves generated by an explosion in a spherical cavity[J].ACTA Geophysica Sinica,1976,19(1):50-63.(in Chinese)
[6]张奇,白春华,刘庆明.爆炸地震波频谱特性研究[J].北京理工大学学报,1999,19(3):306-308.Zhang Qi,Bai Chunhua,Liu Qingming.Frequency spectrum characteristics of explosion earthquak wave[J].Journal of Beijing Institute of Technology,1999,19(3):306-308.(in Chinese)
[7]林大超,白春华.爆破地震效应[M].北京:地质出版社,2007.Lin Dachao,Bai Chunhua.Blasting seismic effects[M].Beijing:Geological Publishing House,2007.(in Chinese)
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[9]Huang Norden E.Hilbert-Huang transform and its applications[R].Greenbelt:NASA/Goddard Space Flight Center,USA,2005.
[10]Schenk V.Frequency content of stress waves in the nearest zone of a spherical explosive source in gravel sandy soil[J].Studia Geoph,1971,15:421-423.
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