可控震源地震勘探在大坝检测中的应用试验
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摘要
某电厂大坝为黏土斜墙堆石坝,其黏土防渗层的状态(密实性、一致性等)是极其重要的问题.瞬态瑞利面波探测技术可用来检测堤坝松散层和土坝渗漏水异常区.可控震源激发波形精确可控,可激发高频地震波,以提高地震勘探分辨率,进行浅层薄层地震勘探.本文应用研制的可控震源地震勘探系统对大坝进行了实地测试,对测试数据进行了频散分析,衰减系数与能量分析,波速计算分析.分析结果表明,大坝局部区域存在低速点;研制的可控震源系统可有效地进行浅层地震信号勘探.
There is a rockfill dam with clay facing in Guangdong,and its earth blanket′s state such as compactness and uniformity is important.Transient Rayleigh wave can be used to inspect the loose layer and leakage anomaly region of the earth dam.The vibroseis source can arouse precise and controllable high frequency seismic wave so as to improve seismic solution for shallow seismic prospecting.Field test is carried out with vibroseis seismic prospecting system developed by our lab in Nanshui dam.Frequency dispersion,attenuation coefficient,energy and wave speed are analyzed as the testing data.It is indicated that the speed of some spots is low,and that the vibroseis system can do shallow seismic prospecting effectively.
There is a rockfill dam with clay facing in Guangdong,and its earth blanket′s state such as compactness and uniformity is important.Transient Rayleigh wave can be used to inspect the loose layer and leakage anomaly region of the earth dam.The vibroseis source can arouse precise and controllable high frequency seismic wave so as to improve seismic solution for shallow seismic prospecting.Field test is carried out with vibroseis seismic prospecting system developed by our lab in Nanshui dam.Frequency dispersion,attenuation coefficient,energy and wave speed are analyzed as the testing data.It is indicated that the speed of some spots is low,and that the vibroseis system can do shallow seismic prospecting effectively.
引文
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[2]赵纯青,尹力峰,唐丽华,等.克孜尔水库大坝的面波检测[J].内陆地震,2002,16(1):53.(ZHAO Chun-qing,YI NLi-feng,TANG Li-hua,et al.Surface wave detection to dam of Kizil reservoir[J].Inland Earthquake,2002,16(1):53.(inChinese))
[3]底青云,MARTYN UNSWORTH,王妙月.复杂介质有限元法2.5维可控源音频大地电磁法数值模拟[J].地球物理学报,2004,47(4):723-730.(DI Qing-yun,UNSWORTH M,WANG Miao-yue.2.5-D CSAMT modeling with the finite elementmethod over 2-D complex earth media[J].Chinese Journal of Geophysics,2004,47(4):723-730.(in Chinese))
[4]王书增,谭春,陈刚,等.面波法在堤坝隐患勘查中的应用[J].地球物理学进展,2005,20(1):262.(WANG Shu-zeng,TAN Chun,CHEN Gang,et al.The application of Rayleigh wave exploration on detecting hidden dam troubles[J].Progress in Geophysics,2005,20(1):262.(in Chinese))
[5]HOOVER G M,GALLAGHER J G,RIGDON HK.Vibrator signals[C]∥Proceedings of the IEEE,1984:1290-1301.
[6]陶知非.世纪之交论可控震源的发展与变化[J].物探装备,2000,10(1):1-6.(TAO Zhi-fei.Discussion on developmentof vibroseis in the exchange of century[J].Equipment for Geophysical Prospecting,2000,10(1):1-6.(in Chinese))
[7]陈祖斌,林君.可控震源扫描控制技术研究[J].计算机工程与应用,2002,38(7):241-243.(CHEN Zu-bin,LI NJun.Study on the control of vibroseis scanning signal[J].Computer Engineering and Application.2002,38(7):241-243.(in Chinese))
[8]张辉.超声层析与瑞利波勘探方法探索及其在工程中的应用[D].北京:中国地质大学,2002.(ZHANG Hui.Methodological research on ultrasonic CT and Rayleigh wave exploration as well as their application[D].Beijing:ChinaUniversity of Geosciences,2002.(in Chinese))
[9]ZHANG W,LIUTX.The research of rare earth-iron giant magnetostrictive seismic source of shallowseismic exploration[C]∥International SymposI Um on Instrumentation Science and Technology,2006:184-189.
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