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Three types of geotomographic surveys (seismic tomography, resistivity tomography, and radar tomography) were conducted at a highway bridge pier construction site to investigate rock characteristics. After the geophysical investigation, bedrock was excavated to construct the bridge foundation. Geological surveys and plate-loading tests were carried out on the excavated surface. The geophysical and geological results were generally in good agreement.
Seismic tomography can distinguish highly fractured rock from unfractured rock, and resistivity tomography and radar tomography can classify rock according to different water contents. The combined use of these three geotomographic surveys made it possible to detect the anomalous zone which was highly fractured and saturated.
geotomography, seismic tomography, resistivity tomography, radar tomography, bridge pier, fracture zone, geotechnical investigation, rock quality
GeophysicistMember of SEG, EAEG, IEEE, SEG Japan, Geotechnical Institute, OYO Corp., c/o Earth Resources Lab., M.I.T., Cambridge, MA
GeophysicistMember of SEG, EAEG, SSJ, SEG Japan, Geotechnical Institute, OYO Corp., Saitama,
GeophysicistMember of SSJ, SEG Japan, IEICE, Geotechnical Institute, OYO Corp., Saitama,
Geologist, Kansai Branch Office, OYO Corp., Osaka,
Senior geophysicistMember of SEG, IEEE, SEG Japan, JSSMFE, JSCE, Head Office, OYO Corp., Tokyo,