Performance of buried pipe installation : tech summary.
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Performance of buried pipe installation : tech summary.

  • 2010-05-01

Filetype[PDF-174.34 KB]

  • English

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    • Alternative Title:
      LTRC tech summary 467
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    • Edition:
      LTRC Tech summary 467.
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    • Abstract:
      Existing codes and recommendations often require standard/minimum values for the bedding, backfi ll, and fi ll cover geometric and mechanical properties in the installation of buried pipes under transportation facilities. These recommended values are often obtained by considering the worst-case scenario for each component and account only in an approximate way for the soil-structure interaction (SSI) between bedding, backfi ll, fi ll cover, and pipes of diff erent materials and mechanical properties. Performance in terms of reliability and cost-eff ectiveness of the design is not fully addressed by current specifi cations. The need arises for revising the current specifi cations to obtain a more effi cient design of the installation of buried pipes. Current design methodologies for buried pipes are still based on the Marston theory for estimating vertical loads. This design method is based on the assumption of an elastic, isotropic soil above and around the pipe. Such an approach has been deemed as overconservative, given the simplifi cations associated with these inherent assumptions. In addition, the method does not consider the eff ects of diff erent bedding materials and thicknesses, nor does it consider the eff ects of a very soft natural soil, which is commonly encountered in Southern Louisiana. The buried pipe installation considered in this project is a trench type with vertical walls, shallow cover, and a single pipe. The live loads due to the vehicular traffi c produce signifi cant stresses on the pipe and the soil in the trench, with a stress distribution strongly dependent on the specifi c geometric and mechanical properties of the entire soil-pipe system.
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