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River-Bottom DC Resistivity for 3-D Imaging in Seoul Subway Tunnel SiteNormal access

Authors: H. Jung, Y. Park, M. Lim, H. Rim and H. Kim
Event name: Near Surface 2005 - 11th European Meeting of Environmental and Engineering Geophysics
Session: Geophysics on Shallow Water
Publication date: 04 September 2005
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 7.19Mb )
Price: € 20

Summary:
B039 RIVER-BOTTOM DC RESISTIVITY FOR 3-D IMAGING IN SEOUL SUBWAY TUNNEL SITE Abstract 1 For site investigation related to planning Seoul subway tunnel construction river-bottom dipole-dipole resistivity survey was conducted in Han-River. In this case we need more precise subsurface information compared with bridge or mountain tunnel construction. We designed high density 3-D water-bottom resistivity exploration. In addition gradient cesium magnetic survey with DGPS-RTK boat system was also conducted. Before field survey we tried several numerical modeling to test the ability to detect two hidden parallel fracture in the 100Ωm rock body. The 3-D resistivity inversion results showed clear low


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