Undrained shear strength and stiffness behavior of natural stiff, geologically aged, plastic clays after undrained cyclic loading
Bibliographic record
Abstract
The degradation of clay deposits under cyclic loading significantly affects slope and foundation stability, necessitating consideration in practical design cases. While the cyclic degradation behavior of postglacial soil is well-studied, understanding the impact on older, stiff, plastic clays is lacking. This study investigates undrained shear behaviors of three UK stiff clays deposited between the Eocene and upper Jurassic periods. Triaxial compression tests on K0-consolidated samples subjected to prior undrained loading cycles reveal reduced post-cyclic shear strength and secant Young’s modulus, with stiffness being more affected than strength. Compared to Holocene soft clays, these stiff clays exhibit substantial strength loss. Correlation between degraded strength/stiffness and cyclically induced pore pressure or applied cyclic stress ratio underscores the role of effective stress conditions resulting from prior cycling. The findings highlight the complexity of cyclic degradation in older, stiff clays and its implications for slope and foundation stability in engineering practice.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.001 | 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".