Abstract
Model tests were carried out in dry silica sand under pile loading and visualizing observation to investigate the behavior of a pile group. The pile group consisted of nine cylindrical model piles of 40 mm in diameter in most tests or three rectangular parallelepiped model piles in the visualizing observation. Pile spacings of 200 mm and 100 mm between pile centers were used in the models. Tactile sensors were installed to measure the pressure distribution in the ground and colored sand layer with particle image velocimetry (PIV) analysis to reveal the ground deformation in addition to strain gauges inside the model piles to investigate the interaction among group piles. The tests results showed that a narrower spacing between piles resulted in a wider affected area of the ground and the interaction was more significant below the tips.
Highlights
The behavior of piles is a nonlinear, three-dimensional soil-structure interaction problem and the resulting response is a function of the pile arrangement, external loads and mechanical properties of the pile and soil [1,2,3,4]
Leung et al [5] found that the role of nonlinearity in pile interaction becomes more significant when the pile spacing is less than 2.5 times the pile diameter
A negative effect, in which bearing capacity of a pile group was less than the summation of that of a single pile, on the bearing capacity of pile group was reported
Summary
The behavior of piles is a nonlinear, three-dimensional soil-structure interaction problem and the resulting response is a function of the pile arrangement, external loads and mechanical properties of the pile and soil [1,2,3,4]. A positive effect, in which the bearing capacity of pile group would be greater than the summation of a single-pile capacity, was reported by Doohyun and Junhwan [9]. In spite of this knowledge, the mechanism of the group effect is not clear yet. The group pile loading tests and visualizing observation of a pile group were conducted with advanced sensors; tactile sensors and particle image velocimetry (PIV) tools. The latter tests were conducted to observe the ground deformation during the penetration of group piles by observing the deformation of colored sand layers and applying PIV analysis to the pictures of the ground deformation
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