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| | Abstract | | We evaluated the effectiveness of 3-D cross-hole resistivity tomography for chemical grouting through laboratory experiment. In this study, we assumed that the borehole for chemical grouting could be used for resistivity tomography measurement. In the model production, borehole electrodes and pipes for chemical grouting were installed vertically in a PVC tank, and Iide silica sand No.7 was filled. The optimum positions of the improved bodies and borehole electrodes were determined by 3-D numerical simulations. 3-D cross-hole resistivity tomography was conducted during chemical grouting in several cases. When comparing the inverted results before and after chemical grouting, resistivity change was clearly observed corresponding to the improved body. The proposed 3-D cross-hole resistivity tomography measurement was found to be effective for monitoring of chemical grouting. |
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