Experimental and numerical study of soil-reinforcement effects on the low-strain stiffness and bearing capacity of shallow foundations |
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| Authors: | Wilson Chung Giovanni Cascante |
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| Institution: | (1) Golder Associates Ltd., Whitby, ON, Canada, L1N 8Y6;(2) Department of Civil Engineering, University of Waterloo, Waterloo, ON, Canada, N2L 3G1 |
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| Abstract: | This paper presents results of meticulous laboratory testing and numerical simulations on the effect of reinforcement on the
low-strain stiffness and bearing capacity of shallow foundations on dry sand. The effect of the location and the number of
reinforcement layers is studied in the laboratory, whereas numerical simulations are used to study the reinforcement-foundation
interaction. Laboratory tests show an increase of 100, 200, and 275% not only in bearing capacity but also in low-strain stiffness
(linear load–displacement behaviour) of a square foundation when one, two, and three layers of reinforcement are used, respectively.
The specimen preparation technique is found to be crucial for the repeatability and reliability of the laboratory results
(less than 5% variability). Numerical simulations demonstrate that if reinforcements are placed up to a depth of one footing
width (B) below the foundation, better re-distribution of the load to deeper layers is achieved, thus reducing the stresses and strains
underneath the foundation. Numerical simulations and experimental results clearly identify a critical zone between 0.3 and
0.5B, where maximum benefits not only on the bearing capacity but also on the low-strain stiffness of the foundation are obtained.
Therefore, soil reinforcement can also be used to reduce low-strain vibrations of foundations. |
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| Keywords: | Soil reinforcement Bearing capacity Low-strain stiffness of foundations Numerical simulations |
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