AXIAL AND LATERAL PERFORMANCE OF HELICAL PILE GROUPS
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Bibliographic record
Abstract
Helical piles represent an efficient deep foundation system that has many applications varying from use as anchors for transmission towers to supporting large compressive loads as well as lateral loads. Helical piles are made of steel shafts with one or multiple helices attached to it, and are installed by rotational force applied through a drive head.\nThe objective of this thesis is to evaluate the performance characteristics of helical pile groups subjected to axial compressive and lateral loads, independently. The effects of pile- soil-pile interaction (group effect) on both the ultimate capacity of the group in terms of group efficiency factors, and on the performance of the group in terms of settlement ratios and interaction factors, are investigated with the aid of three-dimensional nonlinear finite element analysis using the suite, ABAQUS/Standard.\nFive axial compression load tests and three lateral load tests were conducted in northern Alberta site, representing sand, and in northern Ontario site, representing clay, using non instrumented full-scale piles. The test results were used exclusively to calibrate and verify the numerical models that were then used to perform a parametric study. The results of the calibrated numerical models were in good agreement with the field test data using representative soil properties and realistic modeling assumptions.\nThe parametric study involved piles installed in two types of soil: dry sand; and saturated clay. The soil strength ranged from loose to very dense sand and soft to very stiff clay. The piles configurations included two-helix piles with inter-helix spacing of 1, 2, and 3 helix diameters. The piles are spaced at five different distances: 2, 3, 4, 5, and 10 helix diameters. The results of the parametric study showed that the group effect for helical pile is relatively less significant than the case of conventional piles. It was also found that for the range of typical helical pile spacing used in industry (around 3 times the helix diameter), the group effect is insignificant.
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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 | 0.001 |
| 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 it