Bibliographic record
Abstract
The Coquitlam Dam,constructed in 1913,is a 30 m high hydraulic fill embankment dam.The dam is situated in a region of high seismic hazard in British Columbia,Canada.The population at risk is in the tens of thousands.The dam does not meet the present day seismic safety standards.The hydraulic fills in the dam and some foundation soils are loose and susceptible to liquefaction.Under a moderate to severe earthquake,the dam would suffer severe damage with a possibility of dam breach.Seismic upgrade to the dam is required.The maximum design earthquake is a M7.5 event with a peak ground horizontal acceleration of 0.66g.A range of seismic upgrade options was evaluated,ranging from structural remediation,rebuilding of the dam,restricting reservoir operation to decommissioning.On the basis of technical,social,environmental and economic considerations,constructing a new downstream embankment dam was selected as the seismic upgrade option to reduce the seismic risk of the Coquitam dam.The new dam consists of an earth core rockfill embankment and a concrete transition at the left abutment.The new embankment is mostly founded on competent silt while the concrete transition is entirely founded on bedrock.Due to site and constructability constraints,a small portion of the upstream slope of the new dam sitting on part of the downstream shell of the existing dam is underlain by liquefiable sand and gravel alluvium along the original river channel.Advanced seismic stability and deformation analyses demonstrate that the resulting deformations of the dam are acceptable due to large freeboard and thick filter and transition zones.To control foundation seepage and exit gradient,a plastic concrete cut-off wall,a grout curtain,and a set of downstream pressure relief wells are incorporated in the design.To monitor the behaviour and performance of the new dam,a failure mode based approach has been taken in the instrumentation design for both construction and long term monitoring.This paper describes the design of the new Coquitlam Dam,including the design of the instrumentation for dam safety monitoring.
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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 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".