基于小波变换的爆破地震安全能量分析法的应用研究
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摘要
根据爆破地震信号具有持时短、变化快等特点,结合工程爆破地震监测资料,利用小波包良好的时频局部化性质,对爆破地震信号的能量分布特征进行了分析,得到了爆破地震信号不同频带上的能量分布。进而,根据爆破地震信号不同频带的特征频率与受控建筑物自振频率之间的关系确定爆破地震对建筑物的影响。最后,通过工程实例说明了该方法比用单一强度因子作为爆破地震的安全判据更加有效。
Based on the characteristics of short-duration and abrupt of blasting vibration signals and according to measured data from a practical blast,the features of energy distribution in blasting seismic signals were studied by means of the wavelet packet analysis,which had high resolvability and localization,and energy distribution of blasting seismic signals on different frequency bands was obtained.Based on the relation between characteristic frequency of blasting seismic signals on different frequency bands and natural frequency of controlled structure,the influence of the blasting vibration on the structure could be assessed.A practical engineering example proved that the present method was more effective than the safety-judging standard of single intensity factor for blasting vibration.
Based on the characteristics of short-duration and abrupt of blasting vibration signals and according to measured data from a practical blast,the features of energy distribution in blasting seismic signals were studied by means of the wavelet packet analysis,which had high resolvability and localization,and energy distribution of blasting seismic signals on different frequency bands was obtained.Based on the relation between characteristic frequency of blasting seismic signals on different frequency bands and natural frequency of controlled structure,the influence of the blasting vibration on the structure could be assessed.A practical engineering example proved that the present method was more effective than the safety-judging standard of single intensity factor for blasting vibration.
引文
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[2]阳生权,廖先葵,刘宝琛.爆破地震安全判据的缺陷与改进[J].爆炸与冲击,2001,21(3):223–228.(YANG Sheng-quan,LIAO Xian-kui,LIU Bao-chen.Default of the judging standard of blasting vibration safety abstract[J].Explosion and Shock Waves,2001,21(3):223–228.)
[3]张贤达,保铮.非平稳信号分析与处理[M].北京:国防工业出版社,1998:1–12.(ZHANG Xian-da,BAO Zheng.Non-stationary signal analysis and processing[M].Beijing:Defence Industry Press,1998:1–12.)4]王宏禹.非平稳随机信号分析与处理[M].北京:国防工业出版社,1999:12–20.(WANG Hong-yu.Non-stationary random signal analysis and processing[M].Beijing:Defence Industry Press,1999:12–20.)
[5]于德介,程军圣.基于小波变换的时-能密度分析[J].振动工程学报,2001,14(1):45–47,109–112.(YU De-jie,CHENG Jun-sheng.Time-energy density analysis based on wavelet transform[J].Journal of Vibration Engineering,2001,14(1):45–47,109–112.)
[6]邹云屏,李潇.信号变换与处理[M].武汉:华中理工大学出版社,1993:8–12.(ZOU Yun-ping,LI Xiao.Signals transform and processing[M].Wuhan:Huazhong University of Science&Technology Press,1993:8–12.)
[7]胡昌华,张军波,夏军,等.基于MATLAB的系统分析与统计—小波分析[M].西安:西安电子科技大学出版社,1999:210–232.(HU Chang-hua,ZHANG Jun-bo,XIA Jun,et al.System analysis and processing based on MATLAB—wavelet analysis[M].Xi’an:Xidian University Press,1999:210–232.)
[8]Daubechies I.The wavelet transform,time-frequency localization and signal analysis[J].IEEE Transactions on Information Theory,1990,36(5):961–1005.
[9]Daubechies I.Orthonormal bases of compactly supported wavelets[J].Communications on Pure and Applied Mathematics,1988,41(7):909–996.
[10]Kchui C.An introduction to wavelets[M].New York:Academic Press,Inc,1992:297–333.
[11]Mallat S G.A theory for multidimension signal decomposition:the wavelet models[J].IEEE Trans actions on Pattern Analysis and Machine Intelligence,1989,11:674–693.
[12]何军,于亚伦,梁文基.爆破震动信号的小波分析[J].岩土工程学报,1998,20(1):47–50.(HE Jun,YU Ya-lun,LIANG Wen-ji.Wavelet analysis for blasting seismic signals[J].Chinese Journal of Geotechnical Engineering,1998,20(1):47–50.)
[13]林大超,施惠基,白春华,等.爆炸地震效应的时频分析[J].爆炸与冲击,2003,23(1):31–35.(LIN Da-chao,SHI Hui-ji,BAI Chun-hua,et al.Time-frequency analysis of explosion seismic effects[J].Explosion and Shock Waves,2003,23(1):31–35.)
[14]黄文华,徐全军,沈蔚,等.小波变换在判断爆破地震危害中的应用[J].工程爆破,2001,7(1):24–27.(HUANG Wen-hua,XU Quan-jun,SHEN Wei,et al.Application of wavelet transform in evaluation of blasting vibration damage[J].Engineering Blasting,2001,7(1):24–27.)
[15]凌同华,李夕兵.地下工程爆破振动信号能量分布特征的小波包分析[J].爆炸与冲击,2004,24(1):63–68.(LING Tong-hua,LI Xi-bing.The features of energy distribution for blast vibration signals in under-ground engineering by wavelet packet analysis[J].Explosion and Shock Waves,2004,24(1):63–68.)
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