Back-analysis of a tunnelling case history: A numerical approach
Bibliographic record
Abstract
A rapid Light Rail Transit (LRT) system was constructed in the City of Edmonton, Canada to connect the downtown area to the northeast suburbs in the 1970s and later to the south side. The stretch of the LRT passing through the heavily developed downtown area was constructed underground. The underground stations were constructed using the cut-and-cover technique and were connected with two twin circular tunnels about 6.2 m in diameter, and spaced at 11 m centerline to centerline. The tunnels were constructed using a Lovat open face Tunnel Boring Machine (TBM) with the west-bound tunnel, referred to herein as the first tunnel, constructed first followed by the east-bound tunnel, referred to as the second tunnel.The primary lining system consisted of steel ribs spaced at 1.22 to 1.53 m center to centre, and 100 × 150 mm lagging placed between the webs of successive ribs. The secondary lining consisted of cast-in-place reinforced concrete. Detailed information on the lining activationmethod can be found elsewhere, e.g. Eisenstein & Thomson (1978) and El-Nahhas (1980).
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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) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 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) | 0.002 | 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 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".