基于距离加权约束算法的围岩三维电阻率CT反演成像研究

发布时间：2018-03-11 05:13

本文选题：三维电阻率CT　切入点：反演成像　出处：《岩土工程学报》2017年04期 　论文类型：期刊论文

【摘要】：孔中电极附近成像效果差的问题是一直以来困扰三维电阻率CT精细探测的难题,针对该问题,提出了"距离加权"约束反演的思路,通过构建"指数型"衰减的距离加权因子分布模型,对距孔中电源点不同远近的剖分单元赋予差异权重,重点改善了孔中电源点附近区域反演敏感度较高而造成的成像形态畸变问题,提高了三维电阻率CT反演成像方法对异常体三维定位和识别的精度及可靠性。通过数值反演试验和物理模型试验研究,进一步检验了距离加权约束反演方法在改善孔中电极附近异常体成像形态方面的有益效果,试验结果均比较准确地反映了异常体的空间位置、规模和形态。
[Abstract]:The problem of poor imaging effect near the hole electrode has been a difficult problem for 3D resistivity CT fine detection. In view of this problem, the idea of "distance weighted" constrained inversion is put forward. By constructing the distance weighting factor distribution model of exponential attenuation, the differential weight is given to the subdivision units with different distance and near to the power point in the hole. The distortion problem caused by the high inversion sensitivity in the area near the power point in the hole is mainly improved. The accuracy and reliability of 3D resistivity CT inversion imaging method for 3D localization and recognition of abnormal objects are improved. Furthermore, the beneficial effect of the distance weighted constrained inversion method in improving the imaging morphology of anomalous bodies near the electrodes in the hole is tested. The experimental results reflect the spatial position, size and shape of the abnormal bodies accurately.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2013CB036002,2015CB058101) 国家重大仪器设备研制专项(51327802) 国家自然科学基金重点项目(51139004);国家自然科学基金面上项目(51479104)
【分类号】：TU452

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