岩土工程学报2017，Vol.39Issue(4)：652-661,10.DOI:10.11779/CJGE201704009
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
3D cross-hole resistivity inversionimaging of surrounding rockbased on distance weighting constraint algorithm
摘要
Abstract
Aiming at improving the inversion quality of anomalies near the electrodes in boreholes, which has been a large issue interfering in the three-dimensional (3D) cross-hole electrical resistivity tomography (ERT), an inversion method based on the distance weighting constraint is proposed. Different weighting coefficients are assigned to different meshes in the model according to the distances away from the current points in the boreholes, and the computed exponential decay distribution model is established. Under this treatment, the image shape distortion problem of anomalies near the current points in the boreholes resulting from high inversion sensitivity is suppressed, and the resolution of 3D location and reliability of recognition of anomalies by the 3D cross-hole resistivity inversion method is improved. The effectiveness of the distance weighting constraint inversion is further tested and verified through numerical inversion examples and physical model tests. The distribution characteristics such as the spatial location, scale and shape of the anomalies are reflected accurately in the test results.关键词
三维电阻率CT/反演成像/距离加权约束Key words
3D cross-hole ERT/inversion imaging/distance weighting constraint分类
建筑与水利引用本文复制引用
刘征宇,李术才,刘斌,范克睿,聂利超,张欣欣..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[J].岩土工程学报,2017,39(4):652-661,10.基金项目
国家重点基础研究发展计划("973"计划)项目(2013CB036002,2015CB058101) （"973"计划）
国家重大仪器设备研制专项(51327802) （51327802）
国家自然科学基金重点项目(51139004) （51139004）
国家自然科学基金面上项目(51479104) （51479104）
