Abstract
The paper reports on construction of a 9.4 km tunnel in Tokyo, which is part of the Japanese National Railways' expansion program. A tunneling shield was used for about 7 km of the length, and the remainder was built by cut-and-cover techniques. This paper discusses the technical investigations and actual results of shield tunnel excavation in gravel deposits under high water pressure and non-cohesive sand deposits. To obtain data for economical and safe tunnel construction, various field measurements were made during the construction work. Some of these data are introduced and are discussed in connection with the design methods.
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