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| | Abstract | | To evaluate the excavated damaged zone, EDZ, is one of the important factors to conduct high level radioactive waste disposal. There is a possibility to map the extent of EDZ by geophysical exploration methods. We have conducted resistivity and acoustic tomography to evaluate EDZ during the excavation of the test tunnel at a depth of 140m. As a result, a few meters extent of high resistivity and low P-wave velocity zone were detected. This suggests that damaged zone by excavation of horizontal tunnel was estimated by resistivity and acoustic tomography. |
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