Effects of soil structure on the shear behaviour of an unsaturated loess at different suctions and temperatures
Bibliographic record
Abstract
Previous studies of shear behaviour at different suctions and temperatures focused mainly on recompacted soils. Limited attention has been paid to intact soil. In this paper, the shear behaviour of intact and recompacted loess was studied using a suction- and temperature-controlled direct shear apparatus. A scanning electron microscope and mercury intrusion porosimeter were used to evaluate the microstructure of both intact and recompacted loess. For a given suction and temperature, intact specimens exhibit a higher shear stiffness and larger dilatancy than recompacted specimens. This is mainly because clay particles in intact specimens accumulate near grain contacts and stick to the grain surfaces, as revealed in scanning electron microscopy and mercury intrusion porosimetry tests. This type of clay particle distribution in intact specimens results in a more resistant structure and higher yield stress. At suctions of 0 and 200 kPa, the shear stiffness and dilatancy of recompacted specimens increase with temperature. The shear stiffness and maximum dilatancy increase by as much as 47% and 63% at suctions of 0 and 200 kPa, respectively. These increases in shear stiffness and dilatancy are attributed mainly to the continuous plastic volumetric contraction during heating, which induced strain-hardening effects. On the contrary, thermal effects on the stress–strain behaviour of intact specimens are negligible at zero suction. At a suction of 200 kPa, as soil temperature rises from 20 to 60 °C, the shear stiffness and maximum dilatancy of intact specimens decrease by 35% and 68%, respectively. It is evident that intact specimens and recompacted specimens experience opposite thermal effects.
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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) | 0.000 | 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) | 0.000 | 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".