Effect of Eccentric Load on the Undrained Bearing Capacity of Strip Footings above Voids
Publication: International Journal of Geomechanics
Volume 20, Issue 7
Abstract
This study employed finite element limit analysis (FELA) to investigate the influence of eccentric loads on the bearing capacity of footings above single and double continuous voids. Upper bound theorem (UB), lower bound theorem (LB), and adaptive meshing techniques were used in a parametric study to investigate the influence of some factors, including the relative distance between double voids, the depth of voids, the geometry of voids, the variation of soil shear strength, and the eccentricity of loadings on the bearing capacity of footings. The results indicated that, for the footings inclined above a single void, the bearing capacity with a void located on the same side of the eccentric load was less than that in an opposite position. In addition, the failure mechanisms were summarized and analyzed in this study.
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Acknowledgments
This research is a part of the work carried out by grants from the National Natural Science Foundation of China (No. 51978255).
Notation
The following symbols are used in this paper:
- B
- width of the strip footing;
- cu
- undrained shear strength of soil;
- cu0
- undrained shear strength at the ground surface;
- Eu
- undrained Young's modulus of soil;
- e
- eccentric distance of vertical load;
- H
- height of the void;
- k
- variation rate of soil shear strength with depth;
- Nc
- bearing capacity of footing;
- qu
- ultimate bearing capacity of footing;
- s
- spacing between double voids;
- W
- width of the void;
- z
- depth of soil;
- α
- horizontal distance of void;
- β
- vertical distance of void;
- γ
- unit weight of soil;
- μ
- Poisson's ratio of soil;
- ρ
- the effect degree of e; and
- φ
- internal friction angle of soil.
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Published In
International Journal of Geomechanics
Volume 20 • Issue 7 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 5, 2019
Accepted: Dec 17, 2019
Published online: Apr 17, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 17, 2020
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