A New Design Method for Drainage Pipes Buried Under High Fills

Earth pressures acting on, and deformation of, buried pipes installed in sloping-sided ditches were investigated through 24 centrifuge model tests using 1/30-scale 2-D models. The models were placed in a centrifugal acceleration field of 30 G, and a load equivalent to a design load due to several 25-ton vehicles was applied at the center of the ground surface by means of a strip loading plate. The test results fully quantified the effects of the following investigated factors, on the mechanical behavior of the buried pipes: inclination of ditch wall, roughness of ditch wall, cover height, type of backfill soil, and flexibility of pipe. The test results, measured before the surface loading and during the surface loading, were compared with results predicted in accordance with current design standards. The comparison revealed that the current design standards do not reflect the actual behavior of the buried pipes and tend to underestimate the safety of the pipes in most cases, leading to a conclusion that a new design method for the buried pipes is needed instead of the problematical current design standards.

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A new design method for buried pipes installed in sloping-sided ditches

Yoshimura¹,

Tohda²,

Shimazu³

et al. 2010

Jiban Kogaku Janaru

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Static and dynamic centrifuge model tests, conducted to investigate mechanical behavior of buried pipes installed in sloping-sided ditches, revealed that the safety of the pipe is critical under vehicle loading applied in the static tests rather than seismic loading applied in the dynamic tests. The static tests were analyzed by using FEM, in which the soil and pipe were assumed to be linear elastic. Small frictional resistance was allowed at the interface between the pipe and the soil by introducing joint elements. Separation, slip failure, and frictional resistance were also allowed at ditch walls by introducing similar joint elements. The analysis generated results that conformed well to the test results, while the current design standards tend to underestimate the safety of the pipes. Thus, design charts for predicting the vertical deflections and the maximum bending moments of the pipes that are buried in sloping-sided ditches with different inclinations of the ditch walls were constructed by using the FEM. A thorough examination showed that the charts can be applied reasonably to any pipe (regardless of different weights, dimensions and materials), any backfill soil (regardless of different soil types, elastic coefficients and weights), and any cover height, leading to the conclusion that the charts can be used instead of the problematical current design methods.

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A New Design Method for Drainage Pipes Buried Under High Fills

Cited by 4 publications

References 5 publications

Fe Elastic Analysis for Centrifuge Model Tests on Deformation of Drainage Pipes Buried Under High Fills

Fe Elastic Analysis for Centrifuge Model Tests on Deformation of Drainage Pipes Buried Under High Fills

Centrifuge model tests of buried pipes installed in sloping-sided ditches

A new design method for buried pipes installed in sloping-sided ditches

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