Details
| Original language | English |
|---|---|
| Pages (from-to) | 532-539 |
| Number of pages | 8 |
| Journal | International Journal of Geotechnical Engineering |
| Volume | 16 |
| Issue number | 5 |
| Early online date | 24 Aug 2020 |
| Publication status | Published - 2022 |
Abstract
Raft rigidity is one of the governing factors that control the performance of piled rafts; it influences the interactions of the raft with the piles and the soil. By employing extensive three-dimensional Finite Element Analyses, the effects of raft stiffness on the absolute and differential settlements of piled rafts were investigated with the aim of achieving optimal design with limited number of piles. An appropriate constitutive model was applied to simulate the soil behavior, whose parameters were calibrated using pile load test measurements. While raft thickness is found to have minor effects on the settlements of piled rafts with closely spaced piles, a range of raft-soil stiffness ratios between 0.03 and 0.08 are found to minimize settlements for the case of widely spaced piles. Rigid rafts with raft-soil-stiffness ratios higher than 0.1 are recommended to be avoided for not enhancing the performance of the foundation.
Keywords
- 3D-finite element analysis, optimization, Piled rafts, raft rigidity, stratified soils
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
- Agricultural and Biological Sciences(all)
- Soil Science
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In: International Journal of Geotechnical Engineering, Vol. 16, No. 5, 2022, p. 532-539.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of raft rigidity for piled rafts resting on stratified subsoil
AU - Gebregziabher, Henok Fikre
AU - Achmus, Martin
N1 - Funding Information: This research was partially supported by the Catholic Academic Exchange Service (KAAD). The authors sincerely acknowledge the 3 months post-doctoral support for the first author at the Leibniz University of Hannover.
PY - 2022
Y1 - 2022
N2 - Raft rigidity is one of the governing factors that control the performance of piled rafts; it influences the interactions of the raft with the piles and the soil. By employing extensive three-dimensional Finite Element Analyses, the effects of raft stiffness on the absolute and differential settlements of piled rafts were investigated with the aim of achieving optimal design with limited number of piles. An appropriate constitutive model was applied to simulate the soil behavior, whose parameters were calibrated using pile load test measurements. While raft thickness is found to have minor effects on the settlements of piled rafts with closely spaced piles, a range of raft-soil stiffness ratios between 0.03 and 0.08 are found to minimize settlements for the case of widely spaced piles. Rigid rafts with raft-soil-stiffness ratios higher than 0.1 are recommended to be avoided for not enhancing the performance of the foundation.
AB - Raft rigidity is one of the governing factors that control the performance of piled rafts; it influences the interactions of the raft with the piles and the soil. By employing extensive three-dimensional Finite Element Analyses, the effects of raft stiffness on the absolute and differential settlements of piled rafts were investigated with the aim of achieving optimal design with limited number of piles. An appropriate constitutive model was applied to simulate the soil behavior, whose parameters were calibrated using pile load test measurements. While raft thickness is found to have minor effects on the settlements of piled rafts with closely spaced piles, a range of raft-soil stiffness ratios between 0.03 and 0.08 are found to minimize settlements for the case of widely spaced piles. Rigid rafts with raft-soil-stiffness ratios higher than 0.1 are recommended to be avoided for not enhancing the performance of the foundation.
KW - 3D-finite element analysis
KW - optimization
KW - Piled rafts
KW - raft rigidity
KW - stratified soils
UR - http://www.scopus.com/inward/record.url?scp=85089786018&partnerID=8YFLogxK
U2 - 10.1080/19386362.2020.1809839
DO - 10.1080/19386362.2020.1809839
M3 - Article
AN - SCOPUS:85089786018
VL - 16
SP - 532
EP - 539
JO - International Journal of Geotechnical Engineering
JF - International Journal of Geotechnical Engineering
SN - 1939-7879
IS - 5
ER -