Centrifuge Modeling of PGD Response of Buried Pipe

Buried pipelines are used to transport oil, water, sewage, and natural gas. Pipelines in areas prone to earthquakes may experience permanent ground deformation (PGD) and wave propagation hazards. This article presents a new centrifuge-based method for determining the response of continuous buried pipe to PGD. The authors describe the physical characteristics of the 100 g-ton geotechnical centrifuge at Rensselaer Polytechnic Institute (RPI) and the current lifeline experiment split-box. The split-box contains the model pipeline and surrounding soil and is manufactured such that half can be offset, in flight, simulating PGD. The authors also discuss governing similitude relations which allow one to determine the physical characteristics, (diameter, wall thickness and material modulus of elasticity) of the model pipeline. The authors briefly report on a study in which recorded strains induced in two buried pipes with prototype diameters of 0.63 m and 0.95 m (24 and 36 inch) were subjected to 0.6 and 2.0 meters (2 and 6 feet) of full scale fault offsets; they compared their results to corresponding finite element (FE) results. Their data showed that the agreement between pipe strain values measured in the centrifuge and those predicted by FE modeling was quite good for small offsets where the pipe remained elastic. At larger offsets, the agreement between the measured and simulated bending values remained good. However, the measured axial strains were less than those predicted by the FE method.

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  • Authors:
    • O’Rourke, Michael
    • Gadicherla, Vikram
    • Abdoun, Tarek
  • Publication Date: 2005-6

Language

  • English

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Filing Info

  • Accession Number: 01003941
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 20 2005 10:01AM