Publication Date:
2013-07-01
Description:
Soil–pipeline interaction for uplift in granular soil is evaluated by means of a two-dimensional, finite element (FE) continuum model with a Mohr–Coulomb (MC) yield surface for peak strength, a strain-softening relationship tied to critical void conditions, and an equivalent modulus that is consistent with soil deformation at maximum uplift resistance. The model accounts for soil migration beneath the pipe through FE mesh adjustment coordinated with upward pipe displacement. A systematic comparison of model results with multiple full-scale test measurements of pipe in dry sand show excellent agreement both with respect to maximum force and force–displacement relationships, including post-peak performance. The relationship between peak upward force and pipe depth is developed for various sand densities, all of which show maximum force at a depth-to-diameter ratio of 30. Hyperbolic and bilinear models for vertical upward force versus displacement are presented. The analytical approach described in this paper benefits from its adaptation to MC strength selection available in many commercial software packages.
Print ISSN:
0008-3674
Electronic ISSN:
1208-6010
Topics:
Geosciences
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