Key design aspects of Montreal Metro Blue Line extension tunnels
Bibliographic record
Abstract
The Montreal Metro Blue Line extension spans 6 km from Saint-Michel to Anjou, featuring a two-track tunnel, five underground stations, and six auxiliary underground structures. Excavated by a 9.7 m diameter Tunnel Boring Machine (TBM), the tunnel is supported by a 350mm thick precast segmental lining system. This paper focuses on the TBM tunnel’s design, including alignment, geological conditions, spaceproofing, segmental lining geometry and fiber reinforced concrete properties, probing and pre-excavation grouting, instrumentation and monitoring. The structural design follows the latest standards, including ACI 533.5R-20, ACI 544.7R-16, and ITA WG-2, ensuring a robust and durable tunnel structure. This project incorporates innovative design, with a side-by-side tunnel configuration without a separating center wall, a first for North American metro systems. This project advances North American transit infrastructure to address geological challenges and ensure durability using design optimization, including tunnel configuration and lining thickness and material selection.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.010 | 0.001 |
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".