Detection sensitivity analysis of pipe pile defects during low-strain integrity testing

Wu, Wenbing; Yang, Xiaoyan; Jiang, Guosheng; Naggar, M. Hesham El; Mei, Guoxiong; Liang, Rongzhu

doi:10.1016/j.oceaneng.2019.106627

Cited by 20 publications

(14 citation statements)

References 26 publications

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“…To overcome these limitations, extensive work has been carried out on the problem of a single pile in the threedimensional continuum model. [37][38][39][40][41][42] In contrast, there have been relatively few analogous studies of pile groups. Luan et al 43 investigated the vibration response of pile groups using pile-to-pile dynamic interaction factors defined by displacement.…”

Section: Introductionmentioning

confidence: 99%

Vertical dynamic impedance of end‐bearing pile groups embedded in homogeneous unsaturated soils

Shan

et al. 2022

Num Anal Meth Geomechanics

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Although soil is typically an unsaturated (three‐phase) medium, previous studies on the dynamic impedance of pile groups primarily considered the piles embedded in either the single‐phase or fully saturated (two‐phase) soils. In this work, the dynamic impedance of end‐bearing pile groups embedded in homogeneous unsaturated soil subject to a vertical time‐harmonic load is analytically obtained. The soil is modeled as a three‐dimensional axisymmetric continuum, and both the radial and vertical displacements as well as the influence of the saturation degree on the soil's dynamic shear modulus are considered. The governing equations of vibrating unsaturated soil are uncoupled by virtue of the potential function and operator decomposition methods. The attenuation function of soil displacement, surrounding soil resistance factor, and vertical dynamic impedance of a single pile are derived from the pile−soil compatibility conditions. Pile‐to‐pile dynamic interaction factors are then derived and used, along with the superposition principle, to find the vertical dynamic impedance of end‐bearing pile groups in the frequency domain. The proposed analytical solution is verified by comparison with two benchmark solutions. Finally, the influence of various parameters on the dynamic response of end‐bearing pile groups is determined.

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Section: Introductionmentioning

confidence: 99%

Vertical dynamic impedance of end‐bearing pile groups embedded in homogeneous unsaturated soils

Shan

et al. 2022

Num Anal Meth Geomechanics

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“…Throughout the development of the vibration theory of pile foundation, it can be seen that the pile-soil dynamic interaction models are alwaysthe main line of research regarding the vibration problems of pile foundation. In the field of the dynamic interaction between pile and PSS, there are three typical models, namely, the dynamic Winkler model [5][6][7][8][9][10][11][12][13], plain-strain model [14][15][16][17][18][19][20][21][22] and three-dimensional axisymmetric continuum model [23][24][25][26][27][28][29][30][31][32][33][34]. These models greatly promote the development of pile foundation dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…The rigid model is only suitable for end-bearing piles. The second one is the elastic model (simulated by a linear spring) [12,27,37,38] or viscoelastic model (simulated by a Voigt model) [7,[9][10][11][17][18][19]21,39]. Although these models are convenient to use in engineering, the values of model parameters are mostly determined by an empirical formula, which lacks connection with the PES properties.…”

Section: Introductionmentioning

confidence: 99%

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

Yang

Wang

et al. 2022

Energies

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The vertical vibration of a viscoelastic pile immersed in arbitrarily layered soil is investigated by taking the interaction among pile, pile surrounding soil (PSS) and pile end soil (PES) into account. Firstly, considering both the stratification and stress wave effect of soil, a mathematical model of the pile–soil system is established based on the fictitious soil pile (FSP) model. Then, utilizing the impedance function transfer method and Laplace transform technique, the analytical solutions of the vertical dynamic impedance of pile are derived in the frequency domain. The analytical solutions are validated by comparing them with other existing solutions. Finally, a parametric study is put forward to investigate the properties of PES on the vertical dynamic impedance of pile. The results reveal that the properties of PES have a significant effect on the vertical dynamic impedance of pile, but there is a critical influence thickness for this effect. For the cases of the PES thickness exceeding the critical influence thickness, further increase of PES thickness will not affect the dynamic behavior of the pile–soil system.

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“…For instance, the time-domain velocity responses of pipe piles in single-phase soils under vertical transient loads were derived to test the integrity of pile foundations. [18][19][20][21][22][23][24][25][26][27][28][29] The frequency-domain dynamic impedances of pipe piles in single-phase soils subjected to vertical time-harmonic loadings were obtained to evaluate the pile bearing capacity or dynamic characteristics. Moreover, the pile bottom conditions can be divided into four types: (1) free and unsupported pile bottom 30,31 supported by springs and dashpots 32-40 ; (3) half spaces at pile bottom [41][42][43] ; (4) rigid bedrock support at pile bottom.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the importance of vertical bearing capacity and integrity evaluation, more attention have been paid to reveal the dynamic characteristics of pipe piles under vertical loads. For instance, the time‐domain velocity responses of pipe piles in single‐phase soils under vertical transient loads were derived to test the integrity of pile foundations 18–29 . The frequency‐domain dynamic impedances of pipe piles in single‐phase soils subjected to vertical time‐harmonic loadings were obtained to evaluate the pile bearing capacity or dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Vertical frequency‐domain compliance of an elastic pipe pile embedded in a liquid‐filled and porous‐viscoelastic soil

Zhang

Zhan

Deng

2022

Num Anal Meth Geomechanics

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The analytical dynamic compliance of an elastic pipe pile fully buried in a fluidfilled and porous-viscoelastic soil stratum resting on rigid bedrock and subjected to a vertical time-harmonic load is proposed. In this study, the Hamilton's principle of dynamics is employed to establish the governing equations for the pipe pile, which is treated as a two-dimensional (2D) hollow bar structure. The outer and inner soil media surrounding the pipe pile are considered as three-dimensional (3D), homogenous, and liquid-saturated porous continuum, besides they are described by the porous-elastic media model proposed by de Boer. The governing equations for the pipe pile and the soils are solved with the aid of the separation technique of variables, and also utilizing the boundary and contact conditions of the pipe pile and the soils. Then, the analytical solution for the vertical dynamic compliance of the pipe pile is derived. By comparing with the existing solutions and finite element model (FEM), the results from the newly proposed method confirm its validation. Comparative analyses of numerical examples are finally conducted to reveal the variations and response principle of the dynamic compliance of the pipe pile under different material/geometry parameters.

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Detection sensitivity analysis of pipe pile defects during low-strain integrity testing

Cited by 20 publications

References 26 publications

Vertical dynamic impedance of end‐bearing pile groups embedded in homogeneous unsaturated soils

Vertical dynamic impedance of end‐bearing pile groups embedded in homogeneous unsaturated soils

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

Vertical frequency‐domain compliance of an elastic pipe pile embedded in a liquid‐filled and porous‐viscoelastic soil

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