Shaft sinking experience in Athabasca Basin and geoscientific investigations for future shafts / Erfahrungen mit Schachtabteufung im Athabasca Becken und geowissenschaftliche Erkundungen für zukünftige Schächte
Bibliographic record
Abstract
Abstract Shaft sinking through solid rock, which contains little or no water, poses little difficulty. However, when loose, water‐bearing strata have to be contended with, water control measures and pumping facilities are needed. Shaft sinking in the Athabasca Basin requires sinking through water bearing sandstone which can be highly fractured. Intersection of local zones of extensive fracturing results in the potential for high water inflows with hydrostatic pressures of up to 5 MPa. Typically cementitious grouting is carried out ahead of each shaft sinking interval as a water control strategy. Shaft sinking performance which can be quantified in terms of rate of advance is highly dependent on the days spent at each interval grouting before sinking can advance to the next interval. This paper presents the shaft sinking experience in Athabasca Basin and how some of this is translated into geoscientific investigations for future shafts. A comparison of geoscientific data collected from future shafts at McArthur River and other Cameco Corporation operations and project sites. The paper concludes with the strategies for better integration of hydrogeological, geotechnical and geophysical data. Schachtbau im standfesten Gebirge, das wenig oder kein Bergwasser aufweist, bereitet geringe Schwierigkeiten. Wenn jedoch lockere, wasserführende Schichten angetroffen werden, sind Wasserhaltungsmaßnahmen und Pumpeinrichtungen erforderlich. Beim Schachtteufen im Athabasca Becken werden wasserführende Sandsteine angetroffen, die stark zerlegt sein können. Lokale Verschnitte zwischen hoch zerlegten Zonen können zu starken Wasserzutritten mit Drücken bis zu 5 MPa führen. In der Regel werden Zementinjektionen vor jedem Abteufschritt ausgeführt, um die Wasserzutritte zu minimieren. Die Teufleistung hängt sehr stark von der Zeit ab, die für die Injektion benötigt wird, bevor der nächste Ausbruchschritt gemacht werden kann. Dieser Beitrag behandelt die Erfahrungen mit Schachtabteufen im Athabasca Becken, und wie ein Teil dieser Erfahrung in geowissenschaftliche Erkundungen für künftige Schächte einfließt. Geowissenschaftliche Daten von künftigen Schächten bei der McArthur River Mine und anderen Cameco Corporation Betrieben und Projekten werden verglichen. Der Beitrag schließt mit Strategien für eine bessere Integration von hydrogeologischen, geotechnischen und geophysikalischen Daten.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 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".