Dynamic processes in a medium subject to loading as detected by resistivity measurements |
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| Authors: | Wojciech Stopinski |
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| Institution: | (1) Institute of Geophysics, Polish Academy of Sciences, 01-452 Warsaw, Poland |
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| Abstract: | The paper presents the results of measurements of electric resistivity changes in the sample subject to uniaxial loading in
the automatic press. Four-electrode method was used. All minielectrodes were fixed inside the samples. The zone of future
fracture was determined by a kind of pre-cut. Distribution of minielectrode sets in various parts of the samples ensured the
possibility of monitoring the changes of electric resistivity either in the direct fracture zone, or outside of that zone.
The comparison of the measurement data obtained in the fracture zone and outside of it shows that electric resistivity method
can be used to failure prediction in both zones, although the precursor phenomena are much better visible in the direct fracture
zone. The typical progress of changes obtained in the fracture zone is similar to that observed while investigating the resistivity
changes in mines. Decreased repetition time of measurements improved the quality of results. New precursor phenomena were
found out in the course of electric resistivity changes.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 220–228, 1992. |
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| Keywords: | resistivity precursor failure of sample rock burst in mines earthquake |
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