Abstract
The rigid-pile soil-improvement technique aims to increase the bearing capacity of the soil and decrease the settlement of the surface structure. The most remarkable difference of this technique from the deep-foundation system is the soil layer between the pile heads and the structure. This soil layer, called the mattress, is made of compacted granular materials and participates in the load transfer through arching and shear mechanisms. In order to understand the dynamic behavior of rigid-pile reinforced soils, tri-dimensional finite-element analyses of a soil-pile-slab system, a soil-pile-mattress-slab system, and a soil-pile-mattress-embankment system are presented in this paper. Different geometric configurations are studied in terms of dynamic impedances. The soil, piles, mattress, and embankment are represented as continuum solids, and the slab is represented by structural plate-type elements. The horizontal and vertical impedances of pile foundations are presented and the results are compared with studies in the literature. This study shows the influence of the mattress stiffness, the geometrical configuration, and head/tip fixity conditions on the dynamic response of the foundation system. A comparison between rigid piles and pile foundations is then presented.
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Abbreviations
- [M]:
-
Mass matrix
- [C]:
-
Damping matrix
- [K]:
-
Stiffness matrix
- [K d ]:
-
Dynamic-stiffness matrix
- [K ij (ω)]:
-
Dynamic-impedance matrix
- [K s ]:
-
Static stiffness
- cij :
-
Damping coefficients
- a o :
-
Dimensionless frequency
- ω :
-
Driving frequency
- d:
-
Diameter of pile
- L:
-
Length of pile
- S:
-
Distance between the axis of the pile (axis to axis distance)
- P r :
-
Vector of loading at the boundary of the model
- P * f :
-
Vector of forces (moments) caused by the movement of the free field
- P f :
-
Vector of forces (moments) derived from the inertial effect of the superstructure
- P b :
-
Vector of forces (moments) of the superstructure
- P :
-
Vector of the forces applied to the soil-structure system
- U :
-
Resulting displacement from the soil-structure system
- U b :
-
Resulting displacement from the superstructure
- U f :
-
Resulting displacement in the soil-foundation interface
- \(U_{f}^{*}\) :
-
Resulting displacement from the movement of the free field
- Kzz :
-
Vertical dynamic impedance
- Δ Z :
-
Vertical displacement
- Kxx :
-
Horizontal dynamic impedance
- Δ X :
-
Horizontal displacement
- \(\left| {U/F} \right|,\,\left| {u_{0} } \right.\) :
-
Amplitudes of displacement
- F:
-
Force amplitude
- Hss :
-
Height of the soft soil
- Hrs :
-
Height of the embankment
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Messioud, S., Okyay, U.S., Sbartai, B. et al. Dynamic Response of Pile Reinforced Soils and Piled Foundations. Geotech Geol Eng 34, 789–805 (2016). https://doi.org/10.1007/s10706-016-0003-0
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DOI: https://doi.org/10.1007/s10706-016-0003-0