地震层析成像技术在岩体完整性测试中的应用(英文)
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摘要
地震波层析成像借鉴了医学上X射线断面扫描的基本原理,利用地震波穿过地质体后走时及能量的改变等物理信息,通过数学处理重建地质体内部图像,从而得到所研究地质体的岩性及构造分布。本文利用这种方法,在一个钻孔中利用电火花震源激了弹性波,在另一个钻孔布设多个检波点同时接收,拾取弹性波初至时间,将接收到的数据利用SIRT方法进行反演迭代计算,最终形成一个弹性波速度谱图,然后利用岩土体的弹性波速度差异推断岩体完整性分布。与其它测试方法比较,该方法分辨率高,空间位置准确,在工程物探、岩土工程勘察中具有较好的应用前景。
The seismic computed tomography (CT) method is derived from the basic principles of X-ray section scanning first applied in medical science. The method records P-wave arrivals between shots and receivers in separate boreholes. Using the velocity information from 2D seismic P-wave arrival inversion, we can determine the distribution of velocity in rock and soil bodies. This paper introduces a practical case of using the seismic CT method for detecting the structure of the rocks for tunnel engineering and to utilize SIRT algorithms for doing first arrival time iterative inversion. Compared with other exploration methods, it is more efficient and accurate.
The seismic computed tomography (CT) method is derived from the basic principles of X-ray section scanning first applied in medical science. The method records P-wave arrivals between shots and receivers in separate boreholes. Using the velocity information from 2D seismic P-wave arrival inversion, we can determine the distribution of velocity in rock and soil bodies. This paper introduces a practical case of using the seismic CT method for detecting the structure of the rocks for tunnel engineering and to utilize SIRT algorithms for doing first arrival time iterative inversion. Compared with other exploration methods, it is more efficient and accurate.
引文
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Chen Zhonghou, Wang Xingtai, and Du Shihan, 1993Project and environmental exploration course: GeologicalPublishing House, Beijing.
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Rector, J. W., 1995, Crosswell methods: Where are we,where are we going?: Geophysics, 60(6), 629 - 630.
Qiu Qingcheng and Li Weihe, 2001, The application of seismic CT in karst prospecting: Geophysical and Geochemical Exploration, 25(3), 236 - 240.
Wang Chaofan, Zhao Yonggui, Jin Hongxiao, Jin Hongxiao, Guo Hong, and Li Qin, 1998, Seismic tomography and its application to the investigation of buried worked-out area: ACTA Geophysica Sinica, 41(Suppl.), 367-375.
Wang, G., Lin, T. H., Cheng, P. C., and Shinozaki, D. M., 2000, A general cone-beam reconstruction algorithm:IEEE Trans. on Med. Imaging, 108(6), 527 - 533.
Wang Zhendong, 1988, Shallow-layer seismic exploration application technology: Geological Publishing House, Beijing.
Chen Zhonghou, Wang Xingtai, and Du Shihan, 1993Project and environmental exploration course: GeologicalPublishing House, Beijing.
Daley, T. M., Majer, E. L., and Peterson, J. E., 2004,Crosswell seismic imaging in a contaminated basaltaquifer: Geophysics, 69(1), 16 - 24.
Liu He, Wang Yupu, Sui Jun, Xue Jia-feng, and Liu Bing (Eds.), 1998, A broad seismic technology between wells: Petroleum Industry Press, Beijing.
Rector, J. W., 1995, Crosswell methods: Where are we,where are we going?: Geophysics, 60(6), 629 - 630.
Qiu Qingcheng and Li Weihe, 2001, The application of seismic CT in karst prospecting: Geophysical and Geochemical Exploration, 25(3), 236 - 240.
Wang Chaofan, Zhao Yonggui, Jin Hongxiao, Jin Hongxiao, Guo Hong, and Li Qin, 1998, Seismic tomography and its application to the investigation of buried worked-out area: ACTA Geophysica Sinica, 41(Suppl.), 367-375.
Wang, G., Lin, T. H., Cheng, P. C., and Shinozaki, D. M., 2000, A general cone-beam reconstruction algorithm:IEEE Trans. on Med. Imaging, 108(6), 527 - 533.
Wang Zhendong, 1988, Shallow-layer seismic exploration application technology: Geological Publishing House, Beijing.
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