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采用重庆奔腾数控技术研究所的WDJD-3型多功能数字直流激电仪,在电法实验室水槽内布设了探测孤石高阻体的跨孔电阻率CT法观测系统,进行了物理模型实验。物理模拟实验采用多种观测装置(二极、三极和四极装置),对采集到的数据进行反演成像,得到如下结论:①二极装置电阻率CT反演成像结果不能反映出高阻体的位置与大小;②三极装置CT反演成像结果能较好反映孤石高阻体的位置与大小;③四极装置电阻率CT反演成像也能反映出孤石高阻体的位置与规模,效果与三极装置基本相同。物理模拟实验结果表明:三极或四极装置的跨孔电阻率CT法可用于探测高阻体,它具有采集方式灵活、数据稳定可靠、成像结果直观清晰的优点。基于物理模拟实验的结果,采用电阻率CT法对地铁盾构隧道洞身范围内的孤石高阻体探测具有一定的指导意义。对孤石体的三维电阻率CT法物理模拟实验正在进一步研究中。
Using WDJD-3 multi-function digital DC dynamometer of Pentium CNC Institute of Chongqing, a cross-hole resistivity CT observation system for detecting bouldering high resistance body was set up in the electric law laboratory sink and the physical model experiment . Physical simulation experiments using a variety of observation devices (diodes, three-pole and four-pole device), the collected data inversion imaging, the following conclusions: ① bipolar device resistivity CT inversion imaging results can not reflect the high resistance The location and size of the body; ② CT imaging results of the three-pole device can better reflect the location and size of the high resistive body of boulder; ③ CT inversion imaging of the quadrupole device can also reflect the location of the high resistive body And the scale, the effect is basically the same with the three-pole device. The physical simulation results show that the trans-hole resistivity CT method of three-pole or quadrupole devices can be used to detect the high resistance body. It has the advantages of flexible collection method, stable and reliable data, and intuitive and clear imaging results. Based on the results of physical simulation experiments, the resistivity CT method is of guiding significance for the detection of high-resistivity boulders within the tunnel body of the subway shield tunnel. Three-dimensional resistivity CT physical simulation experiment of boulder is under further study.