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| | Abstract | | Dams as large-scale structures should be evaluated for the safety of their water sealing performance after transformation of the structure by strong earthquake vibrations. It is very important to establish monitoring techniques to visualize the penetration during filling of the dam for the long term. The authors conducted an electrical exploration during the first filling of a rock-fill dam site, as well as laboratory tests using samples of the materials which constitute the dam. As a result, a greatly decreased zone of resistivity (-75%) was confirmed in the rock material in the upstream side after filling. In addition, the zone of the resistivity change from 5% to -20% was widely distributed in the core and the rock material in the downstream side. Furthermore, the resistivity of the samples of dam materials decreased to -80% when the water saturation was increased from 20% to 100% in the laboratory tests. These results suggest that water saturation in the dam during filling can be visualized by utilizing the resistivity change. In conclusion, electrical exploration is an effective method to monitor penetration during filling of the dam, and to evaluate the safety of the dam's water sealing performance in the event of large earthquakes. |
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