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| Research on the measurement of interfacial polarization voltage by the extrapolation method |
| MO Wan-Ling1, SUN Zhong-Hua1, XU Ya2, ZHAO Bin2 |
1. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
2. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract It is of practical value to measure the interfacial polarization voltage for improving the sensitivity of BEAM advanced detection method used in TBM tunnel. However, it is difficult for conventional methods to measure the interfacial voltage between solid rock mass and electrode accurately. In order to measure the interfacial voltage, the authors propose an extrapolation measurement method in this paper. The proposed method consists of a sample tube and a number of equally spaced electrodes. Sinusoidal alternating current is exerted on both sides of the sample tube. The AC complex voltages of every electrode are measured. According to the geometrical relationship between the electrodes, the interface voltage of the two power supply electrodes can be obtained by extrapolation. Experimental results indicate that the interfacial polarization voltage between clay and metal electrode can be successfully measured by the proposed method. When abnormal body such as charcoal or water hole exists in the sample tube, the polarization rate change of the measured rock-soil can be greatly raised by subtracting the interfacial polarization voltage from the total voltage. Therefore, the sensitivity of tunnel advance detection can be improved by this method.
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Received: 25 September 2016
Published: 20 June 2017
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