Vertical Dynamic Impedance of a Viscoelastic Pile in Arbitrarily Layered Soil Based on the Fictitious Soil Pile Model

Yang, Xiaoyan; Wang, Lixing; Wu, Wenbing; Líu, Hao; Jiang, Guosheng; Wang, Kuihua; Mei, Guoxiong

doi:10.3390/en15062087

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…Yu et al [27] discussed the influence of sediment thickness on pile complex impedance. Yang et al [28] analyzed the stratification of the pile end soil. Some researchers [29,30] introduced the concept of cone angle and, on this basis, developed an improved model to account for stress diffusion in the bottom soil.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Dynamic Response of a Large-Diameter-Bored Pile Considering the Bottom Sediment and Radial Unloading of the Surrounding Soil

Zhang,

Zhuoma,

Zhang

et al. 2023

Applied Sciences

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The longitudinal dynamic response of a large-diameter-bored pile is investigated considering the bottom sediment and the radial unloading of the surrounding soil. First, the sediment between the pile tip and the bedrock is treated as a fictitious soil pile with a cross-sectional area similarto that of the pile tip. The large-diameter-bored pile (including the fictitious soil pile) is considered as a Rayleigh–Love rod and is divided into finite segments. Under theseconditions, the three-dimensional (3D) effect of the wave propagation along the pile is indirectly simulated by considering the transverse inertia of the pile to avoid complicated calculations. Meanwhile, the surrounding soil is divided into finite annular zones in the radial direction, with the soil properties varying radially as well to simulate the radial unloading of the surrounding soil during construction. The governing equation for each soil zone is built and solved, from zone to zone, to obtain the shear stress acting on the pile. Then, the governing equation for the fictitious soil pile (i.e., the sediment) is solved to derive the dynamic action at the pile tip. In a similar manner to that ofthe fictitious soil pile and together with the recursion method, the governing equation for the pile is solved to obtain the pile’s complex impedance and velocity response. The proposed solution is verified and then introduced to portray the coupling effect of the sediment, pile parameters and radial unloading of the surrounding soil on the longitudinal dynamic response of the large-diameter-bored pile.

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Section: Introductionmentioning

confidence: 99%

Longitudinal Dynamic Response of a Large-Diameter-Bored Pile Considering the Bottom Sediment and Radial Unloading of the Surrounding Soil

Zhang,

Zhuoma,

Zhang

et al. 2023

Applied Sciences

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“…The dynamic interaction between the pile and the foundation soil was not sufficiently studied due to the complexity of the vibrogenerator-pile-foundation soil model [16]. The studied dynamic models of the interactions of vibrogenerator-pile-foundation soil are theoretical models [17][18][19], numerical simulations models [20] and experimental models (in situ or indoor tests) [21][22][23]. Numerical simulation and, especially, analytical modeling of the movement of vibrating piles in saturated soil is quite difficult [24].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Vibratory Piling Machines for Ground Foundations

2022

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Vibrating technological equipment for the introduction of piles and columns into the ground of construction foundations (named vibratory piling machines) is crucial in the process of building stable and resilient foundations for civil engineering, hydrotechnical construction, special construction (e.g., military constructions), bridges, roads and industrial platforms. During the works carried out by the construction companies in various geographical areas of Romania, particularities of the dynamic technological regimes influenced by the nature of the land were identified at the deep introduction of the construction elements in the form of piles or circular (tubular) columns. The results of applied research, rheological modeling and optimization of vibrating equipment, highlight the need for an analytical approach that takes into account the parametric variations of the elastic and damping characteristics of some categories of soils on the depth of piles or foundation columns. In this context, the paper presents the calculation model with the dynamic response for the vibrating equipment of insertion with disturbing forces of 200–1250 kN for piles or columns with lengths of 10–30 m. The novelty of the research study consists in the linear rheological model, which was adopted in the form of a Maxwell–Voigt–Kelvin schematic of the type (E-V)–(E|V), with a discrete variation in four values for stiffness and damping of the soil, as the piles or columns vibrate and advance in the ground foundation. Practical experience of the authors in the field of using vibrogenerators for the introduction of piles in various types of ground foundations led to the adoption of the rheological model with variable damping coefficients depending on the depth of penetration into the soil. The curves of the dissipated power confirm the experimental data obtained in situ, in accordance with the rheological indoor tests of the different types of soil foundations.

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Dynamic torsional impedance of large-diameter pipe pile for offshore engineering: 3D analytical solution

Zhang

Naggar

et al. 2022

Applied Mathematical Modelling

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Vertical Dynamic Impedance of a Viscoelastic Pile in Arbitrarily Layered Soil Based on the Fictitious Soil Pile Model

Cited by 7 publications

References 49 publications

Longitudinal Dynamic Response of a Large-Diameter-Bored Pile Considering the Bottom Sediment and Radial Unloading of the Surrounding Soil

Longitudinal Dynamic Response of a Large-Diameter-Bored Pile Considering the Bottom Sediment and Radial Unloading of the Surrounding Soil

Dynamic Response of Vibratory Piling Machines for Ground Foundations

Dynamic torsional impedance of large-diameter pipe pile for offshore engineering: 3D analytical solution

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