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The effect of backfilling stiffness on lateral response of the shallowly trenched-backfilled pipelines in clay
Offshore pipelines need to be trenched and backfilled in shallow waters for physical protection against the environmental, operational, and accidental loads. These buried pipelines may encounter lateral pipe-soil interaction in various incidents such as ground movements, landslides, ice gouging, and dragging by embedment anchors and fishing gears. Using the pre-dredged material for backfilling is a common and cost-effective solution to fill the trenches. During the construction process and being exposed to the environmental loads, the backfill material is significantly remolded and becomes much softer than the native ground. The different stiffness of backfill and native ground along with trench configuration may significantly affect the internal soil deformations, failure mechanisms, and consequently the lateral soil resistance against the laterally displaced pipeline. However, this important and less-explored aspect is neglected by existing pipeline design standards. In this study, centrifuge tests, particle image velocimetry (PIV), and large deformation numerical analysis were conducted to investigate the effect of different backfilling stiffness on lateral pipeline-backfill-trench interaction and the failure mechanisms around a pipeline shallowly buried in clay. The study showed that ignoring the trenching/backfilling effects may overestimate the ultimate lateral soil resistance for large displacements and underestimate it in small to medium displacements.
The effect of backfilling stiffness on lateral response of the shallowly trenched-backfilled pipelines in clay
Offshore pipelines need to be trenched and backfilled in shallow waters for physical protection against the environmental, operational, and accidental loads. These buried pipelines may encounter lateral pipe-soil interaction in various incidents such as ground movements, landslides, ice gouging, and dragging by embedment anchors and fishing gears. Using the pre-dredged material for backfilling is a common and cost-effective solution to fill the trenches. During the construction process and being exposed to the environmental loads, the backfill material is significantly remolded and becomes much softer than the native ground. The different stiffness of backfill and native ground along with trench configuration may significantly affect the internal soil deformations, failure mechanisms, and consequently the lateral soil resistance against the laterally displaced pipeline. However, this important and less-explored aspect is neglected by existing pipeline design standards. In this study, centrifuge tests, particle image velocimetry (PIV), and large deformation numerical analysis were conducted to investigate the effect of different backfilling stiffness on lateral pipeline-backfill-trench interaction and the failure mechanisms around a pipeline shallowly buried in clay. The study showed that ignoring the trenching/backfilling effects may overestimate the ultimate lateral soil resistance for large displacements and underestimate it in small to medium displacements.
The effect of backfilling stiffness on lateral response of the shallowly trenched-backfilled pipelines in clay
Kianian, Morteza (author) / Shiri, Hodjat (author)
Marine Georesources & Geotechnology ; 39 ; 610-622
2021-05-04
13 pages
Article (Journal)
Electronic Resource
Unknown
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