Finite Element Modelling of Upheaval Buckling of Buried offshore Pipelines in Clayey Soils
Bibliographic record
Abstract
Offshore oil and gas pipelines are often buried to provide environmental stability and protection. Many of these pipes are prone to upheaval buckling and trenches are backfilled to provide soil restraint for the pipelines to resist uplift forces. Soil failure mechanisms can extend to the surface (shallow) or remain in the soil body (deep); the exact conditions that cause this transition are currently unclear. A parametric study of pipeline upheaval buckling in clays has been conducted using the finite element analysis. Mechanisms of failure and pullout forces were investigated for immediate breakaway and fully bonded conditions for undrained rough pipelines. The results indicate that uplift factors (Nc) are similar to those found for plate anchors, with values approximately 4.5 to 6.5%) greater for the pipelines. The critical normalised embedment depths (H/D) for the transition from shallow to deep mechanisms occur between 5 to 6 for both anchors and pipelines.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".