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Test excavations for Seikan undersea tunnel
Design and construction problems of undersea tunnel, to be built for Japanese National Railways, to connect island of Hokkaido with Honshu, are indicated by initial results from test excavations undertaken during construction of pilot tunnel; tunnel support is 125 ×125 mm H-shaped steel and concrete sprayed to depth of 10 cm; unstable sections are prehardened by cement grouting; in most sections displacement of crown heads is 1.5 mm after 150 days of excavation, and load, which acts on tensionmeter, is about 3 tons/sq m; groundwater together with drilling water is pumped up at sites 100 m apart.
Test excavations for Seikan undersea tunnel
Design and construction problems of undersea tunnel, to be built for Japanese National Railways, to connect island of Hokkaido with Honshu, are indicated by initial results from test excavations undertaken during construction of pilot tunnel; tunnel support is 125 ×125 mm H-shaped steel and concrete sprayed to depth of 10 cm; unstable sections are prehardened by cement grouting; in most sections displacement of crown heads is 1.5 mm after 150 days of excavation, and load, which acts on tensionmeter, is about 3 tons/sq m; groundwater together with drilling water is pumped up at sites 100 m apart.
Test excavations for Seikan undersea tunnel
Consulting Engr (Lond)
1967
2 pages
Article (Journal)
English
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