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文中提出了目前钻孔声波CT应用中存在的两个问题:1)检测结果所揭示的地层分布与实际情况存在较大的差异;2)结果的反演建立在波形分析的基础上,缺乏对已揭示地层信息的综合分析。文中提出将CT声波成像方法和钻孔资料相结合,利用现场钻孔取芯数据对CT结果进行校正和重新求解,通过控制两个钻孔的边界值重新调整整个检测剖面的计算数据。该方法综合运用声波检测数据和钻孔边界数据进行计算分析,与单纯波速反演方法相比,充分利用了检测数据和已有地层分布数据,结果更接近于真实地层结构分布。最后将该方法运用到了工程实例中,计算结果不仅与钻孔数据相符,而且其他位置的结构分布与单纯波形反演的结果相比,也更接近于实际地层。
In this paper, two problems existing in the application of boring acousto-CT are proposed: 1) there is a big difference between the stratigraphic distribution revealed by the test results and the actual situation; 2) the inversion of the result is based on the waveform analysis, A comprehensive analysis of stratum information has been revealed. In this paper, CT sound imaging method and drilling data are combined. The coring data of field drilling are used to correct and re-solve the CT results. The calculated data of the whole testing section is readjusted by controlling the boundary value of the two drilling holes. Compared with the simple wave velocity inversion method, this method makes full use of the detection data and the existing formation distribution data, and the result is closer to the distribution of the real formation structure. Finally, the method is applied to the engineering example. The calculation results are not only consistent with the borehole data, but also the structure distribution of other positions is closer to the actual formation than the result of simple waveform inversion.