基于多重互相关函数分析剪切波速
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摘要
介绍了一种提高单孔法剪切波速测量精度的新方法-多重互相关函数法。考虑到判断场地剪切波到时差的困难,提出了用多重互相关函数来求得两剪切波的到时差。互相关分析可求取两相似信号的到时差,但当两信号相似性比较差时,所求得到时差的误差较大;自相关函数本身可进行多重自相关分析,互相关函数结合多重自相关函数后,也可以进行多重互相关分析来求取两相似信号的到时差。试验表明:相比互相关函数,多重互相关函数可改善触发信号和井中三分向探头输出信号的相似性及更好地抑制噪声,因此能更精确地计算出触发信号和井中三分向探头输出信号的的到时差。基于此原理设计了剪切波波速的测试系统,此系统能自动分析出测点的剪切波速和形成完整的报告。
A new wave arrival time difference detection method based on cross-correlation functions for shear wave velocity measurement in single-hole method is introduced.As the difficulty to analyze the arrival time difference of shear wave velocity,the multiple cross-correlation function is used to get the arrival time difference of two similar shearwave velocities.We need do multiple-auto-correlation function to the signal with big noise to get high SNR.Cross-correlation function can get the arrival time difference of two similar signals,but the error is always too big when the nose of signal is big.The auto-correlation function can do multiple auto-correlation analyses;and the cross-correlation also can do multiple cross-correlation analysis with multiple auto-correlation function.The experiments indicate: multiple cross-correlation function can increase the SNR and get the arrival time difference precisely of the signal of shear wave acquainted by trigger and the shear-wave acquainted by probes.Based on this principle,an expert recognition system to calculate shear wave velocity is designed.This system can automatically analyze the shearwave velocity of every measured point and make a complete report.
A new wave arrival time difference detection method based on cross-correlation functions for shear wave velocity measurement in single-hole method is introduced.As the difficulty to analyze the arrival time difference of shear wave velocity,the multiple cross-correlation function is used to get the arrival time difference of two similar shearwave velocities.We need do multiple-auto-correlation function to the signal with big noise to get high SNR.Cross-correlation function can get the arrival time difference of two similar signals,but the error is always too big when the nose of signal is big.The auto-correlation function can do multiple auto-correlation analyses;and the cross-correlation also can do multiple cross-correlation analysis with multiple auto-correlation function.The experiments indicate: multiple cross-correlation function can increase the SNR and get the arrival time difference precisely of the signal of shear wave acquainted by trigger and the shear-wave acquainted by probes.Based on this principle,an expert recognition system to calculate shear wave velocity is designed.This system can automatically analyze the shearwave velocity of every measured point and make a complete report.
引文
[1]中国人民共和国机械工业部.GB/T50269-97地基动力特性测试规范[S].北京:中国建筑工业出版社,2003.
[2]中国建筑科学研究院.GB5011G-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[3]林宗元.岩土工程试验监测手册[M].沈阳:辽宁科学出版社,1994.
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[5]赵记生,陶夏新,欧进萍,等.弹塑性介质内的波速变化[J].岩土力学,2008,29(1):524-529.ZHAO Ji-shen,TAO Xia-xin,OU Jin-pin,et al.Wavevelocity variation in elastoplastic media[J].Rock andSoil Mechanics,2008,29(1):524-529.
[6]范云.填土压实质量检测技术的发展与评析[J].岩土力学,2002,23(4);149-154.FAN Yun.Advance and comment of checking techniqueon the quality of filled soil compaction[J].Rock and SoilMechanic,2002,23(4);149-154.
[7]范云,陈进杰,王明生.以波速代替K30评价路基压石质量的理论与实践[J].岩土力学,2001,22(4);451-455.FAN Yun,CHEN Jin-jie,WANG Ming-sheng.Theoryand practice of subgrade compaction quality testing bysurface wave velocity in stead of index K30[J].Rock andSoil Mechanics,2001,22(4);451-455.
[8]应怀樵.波形和频谱分析与随机数据处理[M].北京:中国铁道出版社,1985.
[9]陈英杰.瑞利波法在工程抗震中的应用[J].世界地震工程,2005,21(1):97-101.CHEN Ying-jie.Application of Rayleigh wave method inearthquake engneering[J].World EarthquakeEngneering,2005,21(1):97-101.
[10]曹会国.基于LABVIEW相关分析的研究[J].山东大学自然科学报,2007,26(2):68-81.CAO Hui-guo.Research on LABVIEW-based correlationAnalysis[J].Journal of Shandong University of Scienceand Technology(Natural Science),2007,26(2):68-81.
[11]罗映霞,马君,朱青松.基于MATLAB的信号相位差的互相关函数求法[J].科技情报开发与经济,2003,13(7):28-30.LUO Ying-xia,MA Jun,ZHU Qing-song.A method forphase difference measurement with correlation functionbased on matlab[J].Sci/Tech Information Development&Economy,2003,13(7):28-30.
[2]中国建筑科学研究院.GB5011G-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[3]林宗元.岩土工程试验监测手册[M].沈阳:辽宁科学出版社,1994.
[4]侯兴民,薄景山,杨学山,等.互相关函数在单孔法剪切波速测量中的应用[J].地震工程与工程振动,2004,24(2):60-65.HOU Xin-min BO Jing-shan YANG Xue-shan et al.Applications of correlation function in shear-velocitymeasurement of single-hole method[J].EarthquakeEngineering and Engineering Vibretion,2004,24(2):60-65.
[5]赵记生,陶夏新,欧进萍,等.弹塑性介质内的波速变化[J].岩土力学,2008,29(1):524-529.ZHAO Ji-shen,TAO Xia-xin,OU Jin-pin,et al.Wavevelocity variation in elastoplastic media[J].Rock andSoil Mechanics,2008,29(1):524-529.
[6]范云.填土压实质量检测技术的发展与评析[J].岩土力学,2002,23(4);149-154.FAN Yun.Advance and comment of checking techniqueon the quality of filled soil compaction[J].Rock and SoilMechanic,2002,23(4);149-154.
[7]范云,陈进杰,王明生.以波速代替K30评价路基压石质量的理论与实践[J].岩土力学,2001,22(4);451-455.FAN Yun,CHEN Jin-jie,WANG Ming-sheng.Theoryand practice of subgrade compaction quality testing bysurface wave velocity in stead of index K30[J].Rock andSoil Mechanics,2001,22(4);451-455.
[8]应怀樵.波形和频谱分析与随机数据处理[M].北京:中国铁道出版社,1985.
[9]陈英杰.瑞利波法在工程抗震中的应用[J].世界地震工程,2005,21(1):97-101.CHEN Ying-jie.Application of Rayleigh wave method inearthquake engneering[J].World EarthquakeEngneering,2005,21(1):97-101.
[10]曹会国.基于LABVIEW相关分析的研究[J].山东大学自然科学报,2007,26(2):68-81.CAO Hui-guo.Research on LABVIEW-based correlationAnalysis[J].Journal of Shandong University of Scienceand Technology(Natural Science),2007,26(2):68-81.
[11]罗映霞,马君,朱青松.基于MATLAB的信号相位差的互相关函数求法[J].科技情报开发与经济,2003,13(7):28-30.LUO Ying-xia,MA Jun,ZHU Qing-song.A method forphase difference measurement with correlation functionbased on matlab[J].Sci/Tech Information Development&Economy,2003,13(7):28-30.
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