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| | Abstract | | Recently, a lot of difficult localized torrential rains to forecast of calling a guerrilla downpour has been generated by the influence of global warming. Sediment disasters such as the mud flow, landslides have been generated by the guerrilla downpour in various places of Japan. In these natural damages, they are not only the transportation such as roads and railways but also it is current states to have done the house and the life damage. The establishment of the technique that can do the accuracy evaluation of shape and hydraulic characteristics of the discontinuity in the bedrock with the causal relation with the slope failure is hoped for. In this report, 3-D electric survey was executed before and after pouring water in the water level observation hole in the slope. The change rate of the resistivity was calculated by repeated survey. Position and strike and dip of weak parts were presumed from the change rate. Next, the saturation was presumed by applying the expression of Archie to the change rate of the electric resistivity. In addition, conversion from the electric resistivity that had been obtained because of 3-D electric survey to RQD was tried from the correlation of the resistivity and RQD. For the reasons stated above, 3-D electric survey is very useful for detail investigation for a slope. |
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