基于S变换的坝体爆破振动信号时频特征分析
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摘要
近区工程爆破将对周围建(构)筑物产生不利影响,而爆破振动的破坏作用又与振动强度、频率以及结构自身的振动特性等综合因素有关.利用连续S变换对某浆砌块石单曲拱坝的坝基爆破振动速度信号进行分析,提取X、Y、Z三个方向速度信号的时频分布特征.结果表明S变换对爆破振动信号有较好的时频分辨率.最后采用质点峰值振动速度、瞬时能量谱和持续时间等指标对坝体的安全性进行评价,认为该大坝处于安全状态.
Construction- induced vibration may produce potential damage to the surrounding infrastructure,and comprehensive factors( e. g.,vibration magnitude,frequency,duration,and structural characteristics) affect the damage. Bedrock vibration velocity recordings of a stone masonry arch dam caused by blasting are analyzed using the continuous S transform.Time- frequency characteristic of the recordings in three directions( i. e.,X- Y- Z) is extracted. The results show that the S transform has a high time- frequency resolution in processing blasting vibration signal. Finally,peak particle velocity,instantaneous energy spectrum,and blasting duration are adopted to evaluate the safety of the dam. It is concluded that the dam is safe.
Construction- induced vibration may produce potential damage to the surrounding infrastructure,and comprehensive factors( e. g.,vibration magnitude,frequency,duration,and structural characteristics) affect the damage. Bedrock vibration velocity recordings of a stone masonry arch dam caused by blasting are analyzed using the continuous S transform.Time- frequency characteristic of the recordings in three directions( i. e.,X- Y- Z) is extracted. The results show that the S transform has a high time- frequency resolution in processing blasting vibration signal. Finally,peak particle velocity,instantaneous energy spectrum,and blasting duration are adopted to evaluate the safety of the dam. It is concluded that the dam is safe.
引文
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[14]邓成发,许昌,葛国昌.大坝爆破振动响应评估分析[J].长江科学院院报,2012,29(4):26-29.
[15]中华人民共和国国家标准.GB6722-2003爆破安全规程[S].北京:中国标准出版社,2003.
[2]MOSTAFA MOHAMED.Vibration Control[M].Micka?l Lallart(Ed.),In Tech,2010:356-380.
[3]陶刘群,于亚伦.爆破振动安全判据三大核心问题研究[J].金属矿山,2012(10):127-129.
[4]SISKIND D E,STAGG M S,KOPP J W and Dowding C H.USBM Report of Investigations 8507-Structure Response and Damage Produced by Ground Vibration from Surface Mine Blasting[R].US Bureau of Mines,1980.
[5]HAMIDI BABAK,VARAKSIN SERGE AND NIKRAZ HAMID.A Case of Vibro Compaction Vibration Monitoring in a Reclaimed Site[C]//Proceedings of International Conference on Advances in Geotechnical Engineering(ICAGE 2011),2011:861-866.
[6]JORDAN J W.Monitoring Blast Effects on Historical Buildings[C]//Proceedings of 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference,Sydney,2010:1046-1052.
[7]罗桂纯,胡平,王治国,等.炸药震源的地震安全性野外实验研究[J].中国地震,2012,28(2):214-221.
[8]李振春,刁瑞,韩文功,等.线性时频分析方法综述[J].勘探地球物理进展,2010,33(4):239-246.
[9]CHEN J.Time Frequency Based Blind Source Separation Technique for Elimination of Cross Terms in Wigner Distribution[J].Electronics Letters,2003(5):475-477.
[10]ROCCO DITOMMASO,MARCO MUCCIARELLI,FELICE C.PONZO.S-Transform Based Filter Applied to the Analysis of Non-linear Dynamic Behaviour of Soil and Buildings[C]//Proceedings of 14thEuropean Conference on Earthquake Engineering.Republic of Macedonia,2010.
[11]陈学华,贺振华.改进的S变换及在地震信号处理中的应用[J].数据采集与处理,2005,20(4):449-453.
[12]STOCKWELL R G,MANSINHA L,LOWE R P.Localization of the complex spectrum:the S transform[J].IEEE Trans.Signal Processing,1996,44(4):998–1001.
[13]STOCKWELL R G.Why use the S transform?in Pseudo-Differential Operators:Partial Differential Equations and TimeFrequency Analysis[M].Rodino L,Schulze B W and Wong M W(Ed.),Fields Institute Communication Series 52,American Mathematical Society,2007:279-309.
[14]邓成发,许昌,葛国昌.大坝爆破振动响应评估分析[J].长江科学院院报,2012,29(4):26-29.
[15]中华人民共和国国家标准.GB6722-2003爆破安全规程[S].北京:中国标准出版社,2003.
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