井间电磁波CT技术及其在岩溶勘察中的应用?
정간전자파CT기술급기재암용감찰중적응용?
Borehole Electromagnetic Imaging and Its Application in Karst Exploration
  • 万方数据
    CT理论与应用研究 CT이론여응용연구
    COMPUTERIZED TOMOGRAPHY THEORY AND APPLICATIONS
    2013年 4期 615-621 ,共7页

    韩果花%黄明曦%李川%何晓玲%杨强%王海燕%周海滨%王有学%熊彬%张智%薛霆虓

    한과화%황명희%리천%하효령%양강%왕해연%주해빈%왕유학%웅빈%장지%설정효

    井间电磁波层析成像%吸收系数%SIRT%岩溶勘察 井間電磁波層析成像%吸收繫數%SIRT%巖溶勘察
    정간전자파층석성상%흡수계수%SIRT%암용감찰
    borehole electromagnetic imaging%absorption coefficient%SIRT%Karst exploration
    井间电磁波层析成像技术是将医学CT应用于地球物理学中的一项新技术，它主要依据电磁波在不同介质中传播时的吸收差异，重建井间介质吸收系数的分布图像，形象及直观地展现研究区域的地质结构。本文详细地研究了井间电磁波层析成像技术的基本原理，对具有高低吸收电磁异常体的理论模型，根据一定的观测系统对电磁波的场强进行了数值模拟，并采用SIRT反演技术对吸收异常体的图像进行了重建；同时将该方法应用于广西某地拟建桥址的岩溶勘查之中，取得了良好的应用效果。
    정간전자파층석성상기술시장의학CT응용우지구물이학중적일항신기술，타주요의거전자파재불동개질중전파시적흡수차이，중건정간개질흡수계수적분포도상，형상급직관지전현연구구역적지질결구。본문상세지연구료정간전자파층석성상기술적기본원리，대구유고저흡수전자이상체적이론모형，근거일정적관측계통대전자파적장강진행료수치모의，병채용SIRT반연기술대흡수이상체적도상진행료중건；동시장해방법응용우엄서모지의건교지적암용감사지중，취득료량호적응용효과。
    The borehole electromagnetic imaging technique is an advanced geophysical technology which is based upon the theory of medical CT to reconstruct the geological structure according to the absorption coefficients of the electromagnetic waves, and then reconstructs geological structure between the boreholes. In this paper, the method is discussed theoretically and computationally in detail for the different models, including low- and high-attenuation anomalies, and the inversion of the large-spare linear equations were solved by the Simultaneous Interactive Reconstructive Technique (SIRT) for the synthetic models to reconstruct the electromagnetic anomalies. Finally the method was applied to the observed data acquired in field to investigate the foundation of a to-be-built bridge in Guangxi province, and the result shows a few possible Karst caves which are fine consistent with the drilling data.
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