The Response of Glass Fibre Reinforced Polymer Pipe Subject to Longitudinal Bending in the Form of Vertical Ground Deformation
Bibliographic record
Abstract
Glass fibre reinforced polymer (GFRP) pipe is a light weight alternative to steel pipe for oil and gas distribution pipelines that is corrosion resistant but whose material properties vary based on production technique and whose failure mechanisms are not well understood. These pipelines may cross through unstable terrain and be subject to flexural bending caused by ground motion causing split and leakage of their contents into the environment. This study examines the response of GFRP pipe to permanent ground deformation and the failure mechanisms exhibited by GFRP material. A series of full-scale tests were performed using the Split Box at the Queen’s University GeoEngineering Laboratory, a facility that can simulate a normal ground fault to mimic permanent ground deformation. Three 5.6 m long GFRP pipe segments were pressurized to zero, 300, and 1000 kPa respectively and subject to 120 mm of differential settlement, causing longitudinal bending at the crown and invert near the fault line. Fibre optic sensors installed longitudinally along the length of the buried samples reveal zones of peak strain and curvature. These zones located on either side of the fault line are shown to be asymmetrical with higher strains recorded on the stationary side of the fault line. The position and magnitude of peak curvature zones changed with increased pressure, shifting further away from the fault line with decreased curvature. The samples did not reach an ultimate limit state, however at 110 mm fault offset the buried pipe wall split resulting in water leaking at the peak curvature zones and pressure loss. Three four-point bending tests were also performed on similar pipe segments 1.8 m long. The flexural tests were used to establish a relationship between curvature and moment for the GFRP pipe which was then used to estimate the lengthwise moment distribution of the buried samples. Comparisons were also made to the flexural responses of the buried pipe.
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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 | 0.000 |
| 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) | 0.001 | 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".