Earth Pressure on Underground Concrete Pipe in a Field Test

by Jun Tohda, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,
Kiyomi Horita, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,
Wataru Shinozaki, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,
Masato Mikasa, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,



Document Type: Proceeding Paper

Part of: Advances in Underground Pipeline Engineering

Abstract: The cause of cracking at the sheetpile extraction in concrete pipes buried by the open excavation method was investigated by loading tests on the pipe and a field test carried out by Osaka City in 1979 using concrete pipes of 1. 8 m inner diameter bedded on concrete cradles. The loading tests and their analysis clarified that the boundary condition between the pipe and cradle, which had been considered fixed, was slidable. The field test showed a marked earth pressure concentration on the pipe crown at the sheetpile extraction, more markedly in the dense backfill than in the loose one. A finite element method analysis successfully explained this earth pressure concentration that was far from the uniform load distribution assumed in the ordinary design.

Subject Headings: Concrete pipes | Field tests | Soil pressure | Pressure pipes | Buried pipes | Load tests | Finite element method | Pipe piles

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