Melbourne's Southbank Interchange: a permanent excavation in compressible clay
Bibliographic record
Abstract
The Southbank Interchange of the Melbourne City Link Project links major freeways and access roads. The permanent excavation covers an area of 3 ha and extends to a maximum depth of 9 m, which is 6 m below the ground water table. Design and construction approaches were developed to (i) control seepage into the excavation to limit groundwater lowering beyond the site, and (ii) limit the effects of potentially damaging base heave during construction. Lateral flow of groundwater into the excavation was controlled by a cut-off wall extending through the compressible clay with a surrounding line of closely spaced recharge wells. Analyses showed the recharge wells in combination with the wall would be effective in limiting drawdown outside the site. Monitoring showed that pore water pressures were maintained within the design criteria, with the assistance of deep recharge of an underlying aquifer to control vertical seepage. Survey showed settlements outside the site were minimal. Shallow pressure relief drains were installed to limit uplift pressures and control base instability in the deepest parts of the excavation. Monitoring of the groundwater levels in the underlying aquifer and comparisons with results from flow models were used to successfully control uplift pressures during construction.Key words: clay, settlement, groundwater, excavation, recharge, construction.
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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 | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.011 | 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".