Critical length for upheaval buckling of straight pipelines buried in ice rich soils
- Univ. of Alaska, Anchorage, AK (United States). School of Engineering
Upheaval buckling, a phenomena receiving attention in offshore pipelines, has also been found to be a problem for onshore arctic pipelines buried in ice rich soils. While anticipated in overbend situations, it is also being found in pipelines designed to be straight. Understanding the mechanics and parameters affecting this behavior are essential to properly designing a buried arctic pipeline. This paper introduces the parameters that have led to upheaval buckling in at least one pipeline and describes the operation of a program that computes the critical buckling loads at various pipe lengths for the inception of upheaval buckling in a buried pipeline. The method uses finite elements to solve the eigenvalue problem for the axial stability of a column with flexible lateral restraints. This program can be used to predict critical lengths for straight pipelines that lose some or all of the lateral restraint of soil through erosion or thermal degradation. The results are used to make decisions concerning backfill and restrain design. The effects of soils stiffness are considered. Additional research needs are also discussed.
- OSTI ID:
- 400935
- Report Number(s):
- CONF-9606279-; ISBN 0-7918-1494-7; TRN: IM9650%%341
- Resource Relation:
- Conference: 14. international conference on offshore mechanics arctic engineering (OMAE), Florence (Italy), 16-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of OMAE 1996 -- Proceedings of the 15. international conference on offshore mechanics and arctic engineering. Volume 5: Pipeline technology; Murray, A. [ed.] [Nova Gas Transmission, Calgary, Alberta (Canada)]; Bruschi, R. [ed.] [Snamprogetti, S.p.A., Fano (Italy)]; PB: 612 p.
- Country of Publication:
- United States
- Language:
- English
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