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Geomechanics and Engineering Volume 35, Number 6, December25 2023 , pages 617-626 DOI: https://doi.org/10.12989/gae.2023.35.6.617 |
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Three-dimensional numerical parametric study of deformation mechanisms of grouped piled raft foundation due to horizontal loading |
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Bo Wang, Houkun Cui, Yan Li, Ya Dai and Nan Zhang
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| Abstract | ||
| In this study, three-dimensional numerical parametric study was conducted to explore deformation mechanisms of grouped piled-raft-foundation due to lateral load in clays. Effects of load intensity, loading angle, soil stiffness, pile diameter, pile spacing and pile length on foundation deformations were explored. It is found that the smallest and largest movements of pile foundation are induced when the loading angles are 0 and 30~60, respectively. By increasing loading angle from 0 to 30~60, the resultant horizontal movements and settlements increase by up to 20.0% and 57.1%, respectively. Since connection beams can substantially increase integrity of four piled raft foundation, resultant horizontal movements, settlements and bending moments induced in the piled raft foundation decrease by up to 54.0%, 8.8% and 46.3%, respectively. By increasing soil stiffness five times, resultant horizontal movements and settlements of pile foundation decrease by up to 61.7% and 13.0%, respectively. It is indicated that effects of connection beam and soil stiffness on settlements of pile foundation are relatively small. When pile diameter is less than 1.4 m, deformations of piled raft foundation decrease substantially as a reduction in the pile diameter. Two dimensional groups are proposed to develop calculation charts of horizontal movements and settlements of pile foundation. The proposed calculation charts can directly estimate movements of piled raft foundation under arbitrary loading, ground and pile conditions. | ||
| Key Words | ||
| calculation chart; horizontal load; horizontal movement; pile foundation; settlement; three-dimensional | ||
| Address | ||
| Bo Wang, Houkun Cui, Yan Li, Ya Dai and Nan Zhang: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China | ||