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List of products by author: K. Okazaki
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Application and geotechnical verification of the time domain electromagnetic method to a gneiss tunnel site
Abstract: The time domain electromagnetic method, TDEM, was conducted to estimate the geological condition and structure on a gneiss tunnel construction site in the Aichi Prefecture, Japan. Three dimensional distribution of resistivity were obtained by plural three measuring lines with TDEM and geological distribution and geotechnical problems were inferred. This paper described the estimation results of...
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Case study of a tunnel with time-dependent behaviour in a volcanic area of Hokkaido
Abstract: Records of the construction and repair of a tunnel with time-dependent deformation were analysed to clarify the mechanism and to construct judging method of time-dependent deformation part. As a result, it was inferred that release of in situ stress of rock converged for about 80 days and time-dependent deformation resulted from rock degradation by the change of rock surroundings mainly with...
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Case study of the deterioration factors of pyroclastic rock and the measurement results of the time dependence...
Abstract: The tunnel deformation, such as heaving or pushing out of the tunnel lining sometimes comes to occur after completion inside the tunnel that was constructed in the area of the pyroclastic rock with hydrothermal alteration. It is a big problem from the viewpoint of safe relief of the community, convenience and countermeasures cost. In this study, geological properties of deformed zone where...
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Project study of tunnels with time-dependent behaviour -A diagnostic method using seismic velocity
Abstract: Recently, continuous ground degradations with a time-dependent behaviour have led to damage of the linings or floor heaving in several in-service tunnels. These time-dependent deformations in tunnels may cause serious social and economic losses. However there is no diagnostic method and a new method is needed to assess these time-dependent behaviours of rock mass behind tunnel lining until its...
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Project study of tunnels with time-dependent behaviour – Geochemical and mechanical characteristic of rock mass
Abstract: In the present research, tunnel geological conditions and mineralogical properties of rock are analysed on the basis of the tunnel construction record with the occurrence of time-dependent deformation. The geology of the studied tunnel is mainly andesitic lava, dacite that includes auto- brecciated lava and pyroclastic rock, all of which have undergone hydrothermal alteration. As the results of...
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