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List of products by author: Y. Ito
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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 - Records of planning and construction
Abstract: Recently, the maintenance of the aging infrastructures has become a more serious social issue in Japan. It would be ideal if the social aging infrastructure could be to be repaired and maintained in an efficient manner. The authors selected a pair of the road tunnels as the study area in order to develop estimation methods for tunnels with time-dependent behaviour of the rock around the tunnel....
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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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