Earth Pressure on Underground Rigid Pipe in a Centrifuge

by Jun Tohda, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,
Naotoshi Takada, 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:

A series of centrifugal model tests on underground pipes that simulate the actual construction process were carried out to investigate the earth pressure concentration onto the pipe (particularly onto its top and bottom) caused by the sheetpile extraction. A rigid model pipe with a smooth or rough surface was prepared to measure both normal and tangential stresses on the pipe. High earth pressure concentration during the sheetpile extraction similar to that in a field test was observed in the test using the smooth surface pipe. The mechanism of earth pressure concentration could be successfully explained both by observed movement of sand particles during the sheetpile extraction and by an analysis of a two-dimensional elastic model. Finally, the loads measured in the tests were compared with those in the ordinary design criteria in Japan.

Subject Headings: Rigid pipes | Soil pressure | Buried pipes | Pressure pipes | Centrifuge models | Pipe materials | Mathematical models | Japan | Asia

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