一种基于爆破振动信号小波分析的爆破危害评判新方法
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摘要
基于Matlab小波分析软件,利用小波包良好的时频局部化性质对现场监测的爆破振动信号进行能量分析,得到爆破振动信号不同频带上的能量分布。根据爆破振动信号在传播过程中能量的变化规律及爆破振动信号的频带能量分布与爆破振动影响的密切关系,据爆破振动信号主振频率所在频域能量和受控结构自振频率所在频域能量,提出一种新的基于爆破振动信号小波分析的爆破危害评判方法。将计算实测点的爆破危害评定参数α与在该点观测到的建筑物的α进行对比。研究结果表明:当α>0.235时,建筑物受损;随着α增大,建筑物受损情况加剧。
Based on wavelet analysis software of Matlab,the energy of the monitoring blasting vibration signals was studied by means of the wavelet packet analysis,which had high resolvability and localization,and the energy distribution of blasting frequency bands was obtained.According to the energy variety regulation of blasting vibration signals in the dissemination process and the close relation between energy distribution for different frequency bands and the blasting vibration effect,a new method for blasting hazards evaluation based on the wavelet analysis of blasting vibration signals was proposed from the aspect of the energy on dominant frequency bands and natural frequency bands of controlled structure.The assess parameter of blasting vibration hazards α was compared with the actual impaired situation of building.The results show that the building is damaged when α>0.235.With the increase of α,the impaired situation of building is intensified.
Based on wavelet analysis software of Matlab,the energy of the monitoring blasting vibration signals was studied by means of the wavelet packet analysis,which had high resolvability and localization,and the energy distribution of blasting frequency bands was obtained.According to the energy variety regulation of blasting vibration signals in the dissemination process and the close relation between energy distribution for different frequency bands and the blasting vibration effect,a new method for blasting hazards evaluation based on the wavelet analysis of blasting vibration signals was proposed from the aspect of the energy on dominant frequency bands and natural frequency bands of controlled structure.The assess parameter of blasting vibration hazards α was compared with the actual impaired situation of building.The results show that the building is damaged when α>0.235.With the increase of α,the impaired situation of building is intensified.
引文
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[2]MA Guo-wei,HAO Hong,ZHOU Ying-xin.Assessment of structure damage to blasting induced ground motions[J].Engineering Structures,2000,22(10):1378?1389.
[3]徐国元,中国生,熊正明.基于小波变换的爆破地震安全能量分析法的应用研究[J].岩土工程学报,2006,28(1):24?27.XU Guo-yuan,ZHONG Guo-sheng,XIONG Zheng-ming.Study and application of energy analysis method for blasting seismic safety based on wavelet transform[J].Chinese Journal of Geotechnical Engineering,2006,28(1):24?27.
[4]钟祖良,刘新荣,梁宁慧,等.质点振动速度与主振频率在爆破监测中的应用[J].重庆建筑大学学报,2006,28(4):38?41.ZHONG Zu-liang,LIU Xin-rong,LIANG Ning-hui,et al.Discussion on application of the peak particle velocity and main vibration frequency in blast vibration monitoring[J].Journal of Chongqing Jianzhu University,2006,28(4):38?41.
[5]凌同华,李夕兵,陈文胜.基于小波分析的爆破地震效应评估[J].振动与冲击,2007,26(2):124?126.LING Tong-hua,LI Xi-bing,CHEN Wen-sheng.Evaluation of blast seismic effect based on wavelet analysis[J].Journal of Vibration and Shock,2007,26(2):124?126.
[6]凌同华,李夕兵.爆破振动信号不同频域的能量分布规律[J].中南大学学报:自然科学版,2004,35(2):310?312.LING Tong-hua,LI Xi-bing.Laws of energy distribution in different frequency bands for blast vibration signals[J].Journal of Central South University:Natural Science,2004,35(2):310?312.
[7]宋光明,曾新吾,陈寿如,等.爆破振动小波包时频特征提取与发展规律[J].有色金属,2003,55(1):115?117.SONG Guang-ming,ZENG Xin-wu,CHEN Shou-ru,et al.Time frequency characteristics extracting and expanding rules of blasting vibration with wavelet packets analysis[J].Nonferrous Metals,2003,55(1):115?117.
[8]凌同华,李夕兵.基于小波分析的爆破震动灾害控制[J].应用基础与工程科学学报,2006,14(增刊):326?328.LING Tong-hua,LI Xi-bing.Initiative control of blast on wavelet vibration damage based transform[J].Journal of Basic Science and Engineering,2006,14(Supple):326?328.
[9]陈寿如,宋光明,史秀志,等.近河堤采矿爆破的震动监测与控制[J].中国有色金属学报,2000,10(1):136?138.CHEN Shou-ru,SONG Guang-ming,SHI Xiu-zhi,et al.Controlling blasting ground vibration near bank[J].The Chinese Journal of Nonferrous Metals,2000,10(1):136?138.
[10]娄建武,龙源,徐全军.小波分析在结构物对爆破振动响应的能量分析法中的应用[J].世界地震工程,2001,17(1):64?66.LOU Jian-wu,LONG Yuan,XU Quan-jun.Study on the wavelet analysis applied in structure response to blasting vibration[J].World Information on Earthquake Engineering,2001,17(1):64?66.
[11]程康,徐学勇.爆破振动频率对地震效应影响的试验研究[J].爆破,2003,20(3):79?81.CHENG Kang,XU Xue-yong.Experimental research on influence of blasting vibration frequency on its vibration effect[J].Blasting,2003,20(3):79?81.
[12]陈庆,王宏图,胡国忠.隧道开挖施工的爆破振动监测与控制技术[J].岩土力学,2005,26(6):964?966.CHEN Qing,WANG Hong-tu,HU Guo-zhong.Monitoring and controlling technology for blasting vibration induced by tunnel excavation[J].Rock and Soil Mechanics,2005,26(6):964?966.
[13]杨年华,刘慧.近距离爆破引起的隧道周边振动场[J].工程爆破,2000,6(2):5?8.YANG Nian-hua,LIU Hui.Vibration field at tunnel contour induced by a close-in blasting[J].Engineering Blasting,2000,6(2):5?8.
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