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List of products by author: M. Nakata
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Importance of Identifying Defects Which Occur During Tunnel Construction for Maintenance, and Examples of Such Defects
Abstract: Maintenance of tunnel structures begins with inspection. Cracks and other defects are frequently found in old tunnels. There are three causes of cracking: external force, material deterioration, and initial defects from construction. As the number of possible causes increases, the determination of cause increases in difficulty. If the characteristics of initial defects are understood, it will...
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Methods for Reducing Contamination Risk of Earth ContainingHeavy Metals from Tunnel Excavation
Abstract: In the construction of two tunnels on Shin-Tomei Expressway in Japan, excavatedrock and earth were found to contain arsenic and pyrite which can lead to the release of arsenic in thelocal area. This resulted in a significant change to the excavation and filling plan as well as to theconstruction cost and time required for completion.The risk of encountering heavy metals-contaminated earth may...
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Research and Development and Management of Technology concerning a Group of Expressway Tunnels (83km in total length)...
Abstract: The New Tomei Expressway (162 km-long section in Shizuoka prefecture) opened for operation in 2012. There are 36 tunnels (71 tubes) and their total tube length is 83 km. The cross sectional area of the tunnels is up to 190 m. The completion of such a project that has tunnels like this has not been seen in quantity or in quality in the past. This paper presents the management of technology of...
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