Slip Resistance of Sandy and Clayey Backfills against Relative Axial Movement of Buried Steel Pipelines
Publication: Geo-Congress 2022
ABSTRACT
Pipelines transporting essential fluids such as water, gas, and oil, usually traverse thousands of miles and they may experience permanent ground deformations (PGDs) induced by landslide, lateral spreading, or fault movement. Pipelines crossing these areas are subjected to longitudinal tensile and compressive stresses applied by relative soil-pipe displacement. The slip resistance developed at pipe-soil interface and along the pipe depends on several parameters such as soil type, density of backfill, rate of movement, and pipe coating conditions. This study utilized a series of pull-out and jacking lab-scale testing setup to evaluate the effect of soil type on slip resistance of buried pipelines. Two types of sandy (SC) and clayey (CL) soils at pipe level were considered as backfill materials. In these tests, a series of uncoated buried steel pipes, instrumented by a loadcell and displacement transducer, were axially moved into and from a soil container with a constant rate of movement. The results from these experimental tests showed that the clayey backfill mobilized 50% more ultimate slip resistance against the pipe movement. The residual slip resistance for pipes surrounded by clayey soil decreased abruptly and up to 45% more after the yield point compared to the pipes buried in sandy backfills. The slip-resistance results were compared with empirical design guidelines and practical recommendations are also discussed.
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Geo-Congress 2022
Pages: 249 - 256
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Published online: Mar 17, 2022
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