Soil Modulus and Longitudinal Pipeline Stresses

by Roger E. Hobbs, Lect.; Dept. of Civ. Engrg., Imperial Coll. of Science and Tech., London, England,

Serial Information: Transportation Engineering Journal of ASCE, 1980, Vol. 106, Issue 6, Pg. 775-786

Document Type: Journal Paper


Two cases of practical interest in pipeline installation and maintenance are examined: the lifting of a continuous line by a pair of slings and the lifting of a single sling. Theoretical analyses including the effects of foundation flexibility are presented, and the solution of the resulting nonlinear equations by a variant of the Newton method described. Nondimensionalized computer results are given for wide ranges of foundation flexibility and other operating parameters, ready for use in design. It is concluded that the total lifted length is sensitive to foundation modulus, while the sling forces and maximum pipe stress are relatively insensitive. The implications of these results for other pipeline problems, ranging from laying by barge to trenching and profiling, are briefly considered.

Subject Headings: Soil modulus | Pipelines | Soil stress | Soil-pipe interaction | Foundations | Foundation design | Case studies | Maintenance

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