Soil Parameters for Assessing Axial and Transverse Behavior of Restrained Pipelines—Part 1: Axial Behavior

Understanding soil-structure interaction behavior of the pipe-soil interface is essential in the characterization and assessment of thrust restraint resistance mechanisms in buried pipelines. Two primary forms of resistance mechanisms, axial and transverse, contribute to the resistance of unbalanced thrust forces that arise at a bend, valve, tee, or other similar sources of thrust in a buried pressure pipeline. The individual contribution from each mechanism would depend on the material properties and constitutive relations of the pipe segments, pipe joint type and configurations, soil, and the pipe-soil interface; internal and external loadings on the pipeline; installation conditions; and relative magnitude of pipe-soil movement. In the water/wastewater industry, pipeline designers frequently rely on guidance from American Water Works Association (AWWA) standards and design manuals. These guidance documents are developed by distinct material-specific standard committees, and the contents are based on differing simplifying assumptions, theories, and design philosophies, and are often uncoordinated. In most cases, the rationale behind the recommended soil parameters is typically undocumented, based on unidentified assumptions, or otherwise not considered directly in guidance documents. This practice leads to inconsistent guidance on selection of soil parameters for use in the soil-structure interaction analysis of different pipe materials and makes improvement of design practices difficult. This paper presents a review of factors that influence frictional resistance with and without transverse movement of buried pipe, and the laboratory and field tests performed to establish frictional coefficient of pipe-soil interface for various pipe materials. Based on this review, the paper discusses the appropriateness of the reported friction coefficients for different pipe materials and/or coatings. Recommendations for the soil and pipe-soil interface parameters have been presented where appropriate based on soil mechanics principles and available results from laboratory or field experimentation.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 1834-1848
  • Monograph Title: Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability

Subject/Index Terms

Filing Info

  • Accession Number: 01536121
  • Record Type: Publication
  • ISBN: 9780784413692
  • Files: TRIS, ASCE
  • Created Date: Aug 4 2014 3:02PM