INTERACTIVE DESIGN OF BURIED FLEXIBLE PIPES - A FRESH APPROACH FROM THE BASIC PRINCIPLES

This paper introduces a new approach to the design and analysis of soil surrounded, circular pipe sections subject to external load. A composite system comprising both pipe and soil is taken as the basic structural unit, and the loads, structural parameters and performance criteria for this system are defined. These important preliminaries enable a systematic interpretation of two-dimensional elastic theory solutions for the stresses, deformations and stability of buried thin-wall cylinders, leading to separate first-order expressions for the effects of uniform and distortional components of load. Because of significant second-order effects, simple superposition of these results is not, however, appropriate. The first-order, small deflection elastic analysis has therefore been extended to make approximate allowance for: (I) changes in pipe geometry at large deflections, and (II) the reduction in buckling resistance caused by out-of-round deflection of the pipe ring. Finally, the complete range of predicted pipe deflection and buckling response for any combination of loads and pipe and soil properties has been plotted on a series of non-dimensional charts. These charts form the basis of a comprehensive design method for buried flexible pipes being developed on behalf of the Transport and Road Research Laboratory. The proposed approach is set out in outline. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00174653
• Corporate Authors:

  Foundation Publications Limited

  7 Ongar Road
  Brentwood CM15 9AU, Essex,   England 
• Authors:
  • Gumbel, J E
  • Wilson, J
• Publication Date: 1981-5

Media Info

• Features: Figures; References;
• Pagination: p. 36-40
• Serial:
  • GROUND ENGINEERING
  • Volume: 14
  • Issue Number: 4
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0017-4653

Subject/Index Terms

• TRT Terms: Buckling; Deflection; Deformation; Design; Design methods; Drainage; Elastic analysis; Flexibility; Loads; Mathematical models; Mechanical elasticity; Methodology; Pipe; Soil structure interaction; Soils; Stability (Mechanics); Stiffness; Strength of materials; Stresses; Tubing; Underground structures
• Uncontrolled Terms: Design criteria; Subterranean
• Old TRIS Terms: Elastic analysis (Structural); Elastic theory; Flexible tubing; Resistance
• ITRD Terms: 5522: Buckling; 5586: Deflection; 5595: Deformation; 9011: Design (overall design); 2937: Drainage; 5567: Load; 6473: Mathematical model; 9102: Method; 3361: Pipe; 4156: Soil; 5931: Stiffness; 5544: Strength (mater); 4372: Subterranean
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00382462
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Apr 30 1984 12:00AM