Axial force–displacement behaviour of a buried pipeline in saturated and unsaturated sand
Bibliographic record
Abstract
Several pipeline projects have been proposed in the world in recent years owing to the rapid growth of the petroleum industry. Onshore pipeline systems are usually buried above the natural groundwater table, where the soil is typically in an unsaturated condition. Rational interpretation of these pipelines is possible by extending the mechanics of unsaturated soils. In this paper, the axial force exerted by way of the relative movement on a prototype steel pipeline in sand under both saturated and unsaturated conditions is determined from laboratory investigations using specially designed equipment. The test results under the unsaturated condition showed significantly higher axial force on the pipeline compared to the saturated condition, attributable to the contribution from matrix suction. Two analytical models proposed in this study, which take into account the influence of matrix suction and dilation, successfully predicted the peak and residual skin friction along the pipe surface. The framework developed, based on experimental studies and analysis of the results and the proposed models that use saturated shear strength parameters and the soil-water characteristic curve, is promising for generating simple tools for the design of pipeline infrastructure buried in sands to ensure their stability and safety, and at the same time provide economical solutions.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".