Combined analysis of electrical resistivity and geotechnical SPT blow counts for the safety assessment of fill dam |
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| Authors: | Seokhoon Oh Chang-Guk Sun |
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| Institution: | (1) Department of Geosystem Engineering, Kangwon National University, Hyoja 2-dong, Chuncheon, Kangwon, 200-701, South Korea;(2) Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources, 30, Gajeong-dong, Yuseong-gu, Daejeon, 305-350, South Korea |
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| Abstract: | Electrical resistivity survey and the geotechnical SPT blow counts (N value) method were simultaneously analyzed to investigate the stability of a center-core type earth-fill dam against the
seepage phenomenon. The coupling of these heterogeneous field methods provided a chance to understand the status of underground
material by comparing the geophysical and geotechnical view. The analysis shows that the zones with low resistivity value
generally have low N value, which means low stiffness. However, some zones with a high resistivity pattern are not accompanied by an increase
of its N value, and are even showing a lower N value. These results imply that one should be careful to directly correlate resistivity value with the real status of the
core material of a fill dam. And a highly resistive zone may be in poor status due to the effect of increase of resistivity
value as a result of the piping condition. Additional laboratory tests show that there is a deficiency of fine soil particles
believed as the clay at the troubled region, which means an increase in resistivity value. Therefore, multiple explorations
should be planned to reduce the uncertainty in application of geophysical methods to dam safety evaluation in order to compensate
the resistivity information of core material. |
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| Keywords: | Fill dam Electrical resistivity SPT N value Piping |
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