BEM analysis of the interaction factor for vertically loaded dissimilar piles in saturated poroelastic soil

Liang, Fayun; Song, Zhu

doi:10.1016/j.compgeo.2014.07.016

Cited by 21 publications

(11 citation statements)

References 31 publications

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“…Due to the symmetry, only 3 types of piles (ie, pile 1, 2, and 5) are selected to analyze. As shown in Tables and , the results in this study are in agreement with those of Poulos & Davis and Liang & Song, which proves the feasibility and accuracy of the presented method.…”

Section: Numerical Resultssupporting

confidence: 89%

“…In order to validate the accuracy of the proposed method, comparisons between the presented study and Poulos & Davis and Liang & Song are carried out. As shown in Figures and , a pile group of 3 × 3 with a rigid cap embedded in multilayered soils is presented, where a represents the pile spacing, and R is the distance between the point sink and the center of the pile group.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In order to approximate the conditions in Poulos and Davis and Liang and Song, the time of consolidation without the point sink is 10 9 s, the soil is taken as a single layer of 10 L in depth in the program, and its Poisson's ratio is taken as 0.4. Due to the symmetry, only 3 types of piles (ie, pile 1, 2, and 5) are selected to analyze.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Influence of a point sink on a pile group in saturated multilayered soils with anisotropic permeability

Shi

et al. 2018

Num Anal Meth Geomechanics

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The behavior of a pile group is solved using the finite element method, and the fundamental solution of saturated multilayered soils with anisotropic permeability is obtained by the analytical layer element method. Based on the supposition of no slip occurring at the pile-soil interface, the governing equations of the interaction between the pile group and the soils due to a point sink are established in the Laplace-Hankel transformed domain by considering the pile-soil compatibility condition. Numerical results are presented to study the effect of point sink pumping, the properties of soils, and the geometries of piles on the behavior of the pile group.

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Section: Numerical Resultssupporting

confidence: 89%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

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Influence of a point sink on a pile group in saturated multilayered soils with anisotropic permeability

Shi

et al. 2018

Num Anal Meth Geomechanics

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“…If equation (5) is not satisfied, then θ is adjusted, and steps 4-6 are repeated; if any pile does not satisfy equation 7, its diameter will be changed to a neighboring diameter which is bigger than it. (7) Step 7: the optimized design with different pile diameters is converted into that with different pile spacing using equation 8:…”

Section: Optimization Methodsmentioning

confidence: 99%

“…e piles are usually uniformly arranged in conventional PRF designs, that is, a consistent pile diameter, length, and spacing. Several studies have shown that even if the load is uniform, the peripheral piles either carry a greater proportion of the load than the central piles under a rigid cap or suffer from a flexible cap which exhibits differential settlement due to pilesoil-raft interactions [2][3][4][5][6][7][8][9][10], and nonuniform loading can exacerbate these problems. Padfield and Sharrock [11] briefly introduced a method of enhancing pile group performance by varying the pile geometries across the group.…”

Section: Introductionmentioning

confidence: 99%

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Xie

Chi

2019

Advances in Civil Engineering

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Important buildings such as nuclear power plants always require stricter control of differential settlement than ordinary buildings. Therefore, it is necessary to provide an optimized design for the piled raft foundations of important buildings. In this paper, a new optimization method (using different pile diameters and different pile spacing) was proposed for the design of piled raft foundations. This method adjusts the pile diameters and pile spacing according to the stress distribution at the pile top of the initial design to achieve a more uniform settlement of the raft and stress distribution on top of piles, which can solve the differential settlement problems caused by uneven loads of the superstructure. After optimized design, the differential settlement and integral bending moment of the raft decreased more than 64% and 52%, respectively, and the differential stress on top of piles decreased by at least 63%. The new method proposed in this paper could be applied to large-scale piled raft foundations with complex superstructure loads.

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An analytical model for the interaction between two dissimilar piles in a finite soil layer

Liu

2021

Num Anal Meth Geomechanics

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An analytical method is developed for the interaction between two dissimilar piles subjected to vertical loadings in a finite soil layer with a rigid base. A fictitious soil column is assumed for the corresponding shaft and the moduli of the soil–pile rod are expressed as a Heaviside step function of the modulus. The vertical soil displacements and the shaft resistances are calculated as the combined contributions by the two dissimilar piles in terms of the respective local coordinate systems. The displacements and stresses in two different local coordinates are transferred from one to the other using Graf's addition theorem. The boundary value problem for the soil layer is solved using the method of separation of variables with a series of undetermined constants. The unknown constants can be determined by considering the compatibility along the interfaces of the two soil–pile rods and the surrounding soil. A parametric study is performed to investigate the effects of the properties of the soil–pile system on the interaction between the two piles. Numerical results show that, for the dissimilar piles in the stiff soil, the effects of the difference of the pile lengths on the interaction factor are negligible. Also, the interaction factor of the dissimilar piles in the soft soil depends heavily on the difference in lengths.

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BEM analysis of the interaction factor for vertically loaded dissimilar piles in saturated poroelastic soil

Cited by 21 publications

References 31 publications

Influence of a point sink on a pile group in saturated multilayered soils with anisotropic permeability

Influence of a point sink on a pile group in saturated multilayered soils with anisotropic permeability

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

An analytical model for the interaction between two dissimilar piles in a finite soil layer

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