Status : Verified
| Personal Name | Buensuceso, Benjamin B. III |
|---|---|
| Resource Title | Empirical methods for predicting precast jacked pile capacity - case studies in the Philippines |
| Date Issued | 2024 |
| Abstract | This research compiles multiple databases and case studies of a variety of precast jacked pile lengths and slenderness ratios tested with high-strain dynamic load pile tests (HSDPT) in the Philippines, to allow for the exploration of the relationship between pile slenderness ratio, HSDPT ultimate capacity, and final jacking force (Pjack), and the establishment of lower-bound predictive formulas best-suited for the collected data. Four case studies are presented, with a total of 135 jacked, square, precast piles installed with hydraulic static pile drivers utilizing dead weights as reaction force. The slenderness ratios of the piles in the four case studies ranged from 5.11 to 63.8. The ratio of an ultimate capacity measured in the HSDPT to Pjack, also called pressure ratio, was found to be a function of the slenderness ratio, with pressure ratios increasing above 1.0 for longer piles with slenderness ratios above 30. All pressure ratios were found to be above a previously proposed 95% confidence line from Zhang et al. (2006), despite not all HSDPTs having pile sets above 2 mm, indicating the piles’ capacity as measured by a static load test (SLT) may not yet be mobilized. On the other hand, only 125 of the 135 (93%) jacked piles had actual ultimate capacities above a predicted geotechnical ultimate capacity based on AS-2159. However, 9 of the 10 piles with over-predictions had HSDPT sets below 2 mm and likely under-estimates of SLT ultimate capacity. As such, higher HSDPT capacities can likely be expected if sets above 2 mm were mobilized during the tests on these 9 piles. Two alternative lower-bound pressure ratio formulas that are a function of slenderness are proposed, particularly to deal with low-slenderness piles in the database (L/D < 10) that cannot be adequately modeled by existing formulas such as those from Zhang et al. (2006). Greater than 95% of all actual pressure ratios and capacities were above the predicted for both formulas proposed. |
| Degree Course | MS Civil Engineering - Geotechnical Engineering |
| Language | English |
| Keyword | pile test; deep foundation; pile capacity; jacked pile |
| Material Type | Thesis/Dissertation |
Preliminary Pages
919.67 Kb
Category : F - Regular work, i.e., it has no patentable invention or creation, the author does not wish for personal publication, there is no confidential information.
Access Permission : Open Access