用于地铁盾构区间孤石探测的三维电阻率跨孔CT方法研究及物理模型试验

doi:10.13722/j.cnki.jrme.2014.1696

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Abstract Locating boulders in metro shield zones is a complex three dimensional detection problem that has not been resolved. In order to improve the detection accuracy，3D resistivity cross-hole tomography was introduced into boulder detection in subway construction. Based on the typical detection arrangement of cross-hole resistivity prospecting using four parallel boreholes，the inverse imaging equation and the suitable corresponding equipment were investigated. It was found from numerical simulations that using potential gradient data gathered by an array of AM-BN electrodes will produce the best quality image of the detected boulders. On this basis，further numerical simulation studies were carried out on the influence of borehole distance and electrode spacing on the final the detection result. Consequently，the rational parameters for the 3D resistivity cross-hole tomography detection method were determined. The method was then tested on the detection of small boulders and densely populated boulder swarms. Finally，physical model experiments were carried out to verify the study. The detection result indicated the actual distribution of high resistivity bodies with a high level of accuracy，suggesting the feasibility of using the 3D resistivity cross-hole tomography method in metro shield zone boulder detection.

Key words： tunneling engineering metro shield zones boulder 3D resistivity cross-hole tomography observation modes influencing factors

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1696 OR http://www.rockmech.org/EN/Y2015/V34/I12/2519

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