津軽海峡西口附近に於けるマリンドリルの施工について
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概要
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The Seikan Tunnel is the longest submarine tunnel in the world located under the Tsugaru Straits, connecting the mainland of Japan with the island of Hokkaido. It lies 100 m under the seabed about 150 m below sealevel and is as long as 23 km even only in submarine length. The geological formation consisting of soft-sandy mudstone made the constructing job of the tunnel extremely difficult, but the pilot tunnel was successfully driven through in January 1982. The Japan Railway Construction Republic corporation, by whose responsibility the century project is being carried out, estimates that the main tunnel will be completed in 1985. Geological survey of the west end of the strait where the tunnel was planned to go through started in 1946. Geolgical exploration by a submersible core drill, which played an important role for the preparation of the marine geological map, was conducted in 1958, 1968 and 1978. The submersible drilling equipment I am going to mention heren is lowered to the seabottom by a which mounted on a working vessel, sitting on it, and practising core sampling by means of power-supply and remote control cables connecting the drill to the vessel. The first exploration work by a submersible drill for the construction of the Seikan Tunnel was conducted in 1958 by an "Ogawa" Type drill at 25 points along both the coasts of the strait. The sample was very valuable for the geological analysis of she site in telling us that the zone 1-15 cm below the surface of the seabed generally withered and faded.
- 一般社団法人日本応用地質学会の論文
- 1984-06-30