Numerical analysis of group effects of a large pile group under lateral loading

Jones, K.; Sun, Mingyue; Lin, Cheng

doi:10.1016/j.compgeo.2022.104660

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…The mesh is generated automatically, and specific enhancements have been implemented to achieve smaller mesh sizes in areas where stress and deformation are concentrated, such as piled raft, footing, and pile group locations 44 , 45 . Finite element calculations require dividing the geometry into elements.…”

Section: Methodsmentioning

confidence: 99%

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Chimdesa,

Jilo

et al. 2023

Sci Rep

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Foundation plays a vital role in weight transfer from the superstructure to substructure. However, foundation characteristics such as pile group, piled raft, and footing remain unfolded due to their highly non-linear behaviour in different soil types. Bibliography analysis using VOSvierwer algorithm supported the significance of the research. Hence, this study investigates the load-bearing capacity of different types of foundations, including footings, pile groups, and piled rafts, by analyzing experimental data using finite element tools such as PLAXIS 2D and GEO5. The analysis involves examining the impact of various factors such as the influence of surcharge and the effect of different soil types on the load-bearing capabilities of the different types of foundation. For footing, parametric investigations using PLAXIS 2D are conducted to explore deformational changes. Pile groups are analyzed using GEO5 to assess their factor of safety (FOS.) and settling under various criteria, such as pile length and soil type. The study also provides insight into selecting the right type of foundation for civil engineering practice. Findings showed that different soil types have varying deformational behaviours under high loads with sandy soil having less horizontal deformation than clayey soil. Also, it was observed that increasing the pile thickness by 50% resulted in a reduction of 13.88% in settlement and an improvement of 16.66% in the FOS. In conclusion, this study highlights the importance of professionalism, exceptional talent, and outstanding decision-making when assessing the load-bearing capabilities of various foundation types for building structures.

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Section: Methodsmentioning

confidence: 99%

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Chimdesa,

Jilo

et al. 2023

Sci Rep

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show abstract

“…However, it does not display the intermediate plasticity region B. In the "X-shape" pile group, the boundary of the heaviest plasticity region with the most deformation is shallow, at 0.5 m. This indicates that the pile spacing differences in the "Xshape" pile group may result in an incomplete group pile effect [48]. Under the same seismic conditions, differences in pile spacing result in non-uniform soil compression.…”

Section: Piled Foundation Energy Absorption and Dissipationmentioning

confidence: 97%

Pile Arrangement for Minimizing Plastic Deformation in Pile-Supported Immersed Tunnel under Seismic Loads

Fan,

Zhuang,

et al. 2023

Applied Sciences

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The plastic region of piles under seismic loads is a crucial concern in seafloor improvement design. This paper establishes a physical model of the sand compaction pile-immersed tunnel–water pressure system. This research studies pile arrangements that minimize the sand compaction pile plastic region under seismic loads. The experiments were validated through numerical simulations. The results show that “X-shaped” and rectangular pile groups increase the Energy Residual Index (ERI) due to differences in pile spacing and the instability of the quadrilateral prism damping units formed by piles and soil. In this scenario, piles are limited to heavy and mild plastic regions, with boundary depths at L = 2.25 D and L = 2.08 D (L represents the pile length, and D is the pile diameter). Furthermore, increased water pressure amplifies the structural resonance injury, increasing ERI. In conjunction with the soil, hexagonal pile groups create triangular prism damping units that counteract seismic wavefronts. The total kinetic energy and strain energy of the piled foundation are lower than those of the “X-shaped” and rectangular pile groups. The boundaries between the heavy plastic region, the moderate plastic region, and the mild plastic region are located at depths of L = 4 D and L = 8 D, respectively. This study also reveals that a top-heavy mass distribution in the structure leads to maximum deformation in the heavy plastic region. Pile–soil damping units primarily operate within the moderate plastic region.

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“…The dynamic interaction analysis between the surrounding soil and buried pile group has been performed using different theoretical methodologies. Jones et al 1 investigated the group impacts of large pile groups on the vibration characteristics utilizing the 3D finite element (FE) approach. Khorramian et al 2 presented an optimization of reliability assessment for the lateral dynamic response of pile groups using the nonlinear FEM.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic interaction analysis between the surrounding soil and buried pile group has been performed using different theoretical methodologies. Jones et al 1 . investigated the group impacts of large pile groups on the vibration characteristics utilizing the 3D finite element (FE) approach.…”

Section: Introductionmentioning

confidence: 99%

3D analytical modeling of moving‐loading induced pile‐group behavior in stratified cross‐anisotropic poroelastic water‐saturated soils based on two stage theory

Yang,

Jia

2024

Num Anal Meth Geomechanics

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The aim of this paper is to propose a two‐stage theory‐based analytical method for the dynamic performance of pile groups in layered poroelastic saturated cross‐anisotropic soils induced by moving loadings. Among them, the free‐field vibrational analysis of saturated soils is performed by the analytical element‐layer approach (ALEA) and Fourier transformation. Based on the free‐field response, the boundary element (BE) solution for the soil resistance at the soil‐pile interface is derived utilizing the two‐stage theory. Simultaneously, the finite element (FE) solutions for the pile shaft resistance and deformation of pile groups are derived based on the Timoshenko beam theory. Finally, the FE‐BE coupled dynamic equation for deformations and internal loadings of the soil‐pile system is obtained. Thereafter, the reliability of the proposed method is validated by comparing with existing solutions and FE data from ABAQUS. Based on the derived solutions, a comprehensive parametric study is performed to examine the effects of loading amplitude, force speed, soft soil‐layer stiffness, soil anisotropy, and pile length on the dynamic responses of pile groups.

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Numerical analysis of group effects of a large pile group under lateral loading

Cited by 17 publications

References 17 publications

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Pile Arrangement for Minimizing Plastic Deformation in Pile-Supported Immersed Tunnel under Seismic Loads

3D analytical modeling of moving‐loading induced pile‐group behavior in stratified cross‐anisotropic poroelastic water‐saturated soils based on two stage theory

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