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Bending Moment of Underground Flexible Pipes in a Centrifuge

by Naotoshi Takada, Osaka City Univ, Civil Engineering, Dep, Osaka, Japan,
Jun Tohda, 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 effect of several factors on bending moment of an underground flexible pipe section buried in a ditch with sheet piling was investigated experimentally by means of centrifugal model test. The models were two-dimensional with various combinations of the four factors: 1) wall thickness (rigidity) of pipe, 2) width of ditch, 3) cover height and 4) backfill density. The sheet piles were extracted during flight to simulate the actual construction procedure. The bending moment of the pipe increased remarkably with the extraction of the sheet piles, and pipe rigidity and ditch width were found to be the major sensitive factors for the bending moment. A cushion placed under the pipe was found effective to reduce the bending moment of the pipe, whereas a cushion on the top was not.

Subject Headings: Buried pipes | Flexible pipes | Pipe materials | Soil-pipe interaction | Pipeline materials | Moment (mechanics) | Soil tests

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