Design and construction of a concrete caisson wharf in the Canadian Arctic
Bibliographic record
Abstract
Xstrata Nickel operates the Deception Bay port, located in northern Quebec; it is the primary link for the import of mine consumables and export of nickel. Despite the thick land-fast ice, shipping continues year-round using icebreaking bulk carriers. The original wharf was built in 1971 and consisted of three cellular sheet pile structures. Inspections carried out in 2005 should that it was in the initial stage of collapse, requiring replacement. In order to complete the project in the available construction window, the wharf was constructed using concrete caissons slipformed in Atlantic Canada. Due to the risks associated with in-water towing of the caissons using tugs over the long exposed distance through the North Atlantic Ocean, a semi-submersible vessel was used to ferry the caissons to the Arctic. To float and load the 4,000 tonne caissons over the vessel, the caissons had to be relatively lightweight with low draft while ensuring adequate floating stability and structural capacity. Once onsite, the caissons were sunk onto a rock mattress in front of the existing facility and imported rock fill was placed using self-unloading vessels, burying the old sheet pile structure. Other key components of the port such as flexible concrete scour protection mats, concrete foundations, and steelwork were fabricated in the south and shipped by cargo vessel. The new facility was successfully constructed on time, under budget, in fewer than 100 days on-site, without any lost time incidents.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.005 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.003 |
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".