Vertical dynamic response of pile in a radially heterogeneous soil layer

Yang, Dongying; Wang, Kuihua; Zhang, Zhiqing; Leo, Chin Jian

doi:10.1002/nag.755

Cited by 47 publications

(36 citation statements)

References 8 publications

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“…As for the inhomogeneity of initial stress field, solving the dynamic characteristics of soil is not easy. The similar subdivision method by Yang et al is herein used. As is illustrated in Figure , the inner zone is uniformly subdivided into m ′ thin concentric annular sublayers (the slightly remolded zone beyond the annulus with radius re is numbered as m ′ + 1).…”

Section: Formulations For Dynamics Of Soilmentioning

confidence: 99%

“…holds. According to (12), the expression for the initial radial stretch λ r (r) can readily be deduced as…”

Section: Dynamic Characteristics Of Soilmentioning

confidence: 99%

“…where b S 0rz is the component of the increments in nominal shear stress referring to configuration B. t is the time. Taking (12), (17), and (20) into account, we finally deduce the expression of b S 0rz from (9)…”

Section: Dynamic Characteristics Of Soilmentioning

confidence: 99%

“…Based on those findings, the studies on the vertical dynamic interaction of driven pile and soil had been undertaken. Yang et al compared the vertical dynamics of pile surrounded by a strengthen and a weaken soil zone and found that the dynamic response of pile and the decay of reflected signal at the pile top depend on the soil variation characteristics and the radius of the disturbed zone. Other investigations on the vertical vibration of the pile were focused on the influence of wave effects, weld characteristics, construction disturbance, or variation in cross section .…”

Section: Introductionmentioning

confidence: 99%

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On vertical dynamic stability and cross‐section optimization of closed‐ended hollow pile by considering soil compaction effects

Ning

et al. 2018

Num Anal Meth Geomechanics

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Summary This paper conducts a comprehensive study on the effects of expansion force after pile driving on the vertical vibration of the hollow pile. The initial radially inhomogeneous strain field of soil in disturbed soil region and dynamic shear modulus of remolded soil are constructed by applying the cylindrical cavity expansion method. The equation governing the incremental motion of the soil is consequently deduced on the basis of incremental deformations superposed on an underlying finite deformation. The longitudinal impedance of the top of the pile and the velocity response in frequency and time domains are also numerically studied. The relations between the expansion force after pile driving and the velocity response of the pile with different wall thickness are discussed accordingly. The results suggest that a pile has a better dynamical stability when the characteristics of the section are optimized and interacting force with soil medium gets smaller.

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Section: Formulations For Dynamics Of Soilmentioning

confidence: 99%

“…holds. According to (12), the expression for the initial radial stretch λ r (r) can readily be deduced as…”

Section: Dynamic Characteristics Of Soilmentioning

confidence: 99%

Section: Dynamic Characteristics Of Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On vertical dynamic stability and cross‐section optimization of closed‐ended hollow pile by considering soil compaction effects

Ning

et al. 2018

Num Anal Meth Geomechanics

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“…Such a simplified model is not sufficiently accurate unless the pile is end bearing. In the second approach, it is assumed to be elastic boundary (modeled by a linear spring) (Wang et al 2001(Wang et al , 2008(Wang et al , 2009 or viscoelastic boundary (modeled by a linear spring and a dashpot connected in parallel) (Novak & Beredugo, 1972;Liao & Roesset, 1997a, 1997bRandolph et al, 1986Randolph et al, , 1992Wang et al, 2010). Although these methods are amenable to practical application in pile nondestructive testing, the parameters of spring and dashpot can not be obtained by associating with those of the pile end soil.…”

Section: Introductionmentioning

confidence: 99%

A New Model for the Dynamic Interaction of a Pile and Pile End Soil

Wu¹,

Huang²,

Ma³

et al. 2014

Icptt 2014

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Allowing for the shortcomings of the existing dynamic interaction models of pile and pile end soil, this paper presented a new model to simulate the dynamic interaction of pile and pile end soil, namely, fictitious soil pile model. At first, finite soil layers below pile end are modeled as fictitious soil pile whose cross-section area is the same as that of the pile. Meanwhile, the surrounding soil layers of pile are modeled by using plane strain model. Then, the semi-analytical solution of longitudinal dynamic response at the pile head in time domain is derived by means of Laplace transform and impedance function transfer method. Based on this solution, a parametric study is conducted to study the influence of parameters of soil below pile end on the longitudinal dynamic response at the pile head.

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Dynamic response of a pile considering the interaction of pile variable cross section with the surrounding layered soil

Wang

Xiao

2017

Num Anal Meth Geomechanics

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Assuming that the pile variable cross section interacts with the surrounding soil in the same way as the pile toe does with the bearing stratus, the interaction of pile variable cross section with the surrounding soil is represented by a Voigt model, which consists of a spring and a damper connected in parallel, and the spring constant and damper coefficient are derived. Thus, a more rigid pile-soil interaction model is proposed. The surrounding soil layers are modeled as axisymmetric continuum in which its vertical displacements are taken into account and the pile is assumed to be a Rayleigh-Love rod with material damping. Allowing for soil properties and pile defects, the pile-soil system is divided into several layers. By means of Laplace transform, the governing equations of soil layers are solved in frequency domain, and a new relationship linking the impedance functions at the variable-section interface between the adjacent pile segments is derived using a Heaviside step function, which is called amended impedance function transfer method. On this basis, the impedance function at pile top is derived by amended impedance function transfer method proposed in this paper. Then, the velocity response at pile top can be obtained by means of inverse Fourier transform and convolution theorem. The effects of pile-soil system parameters are studied, and some conclusions are proposed. Then, an engineering example is given to confirm the rationality of the solution proposed in this paper.

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Vertical dynamic response of pile in a radially heterogeneous soil layer

Cited by 47 publications

References 8 publications

On vertical dynamic stability and cross‐section optimization of closed‐ended hollow pile by considering soil compaction effects

On vertical dynamic stability and cross‐section optimization of closed‐ended hollow pile by considering soil compaction effects

A New Model for the Dynamic Interaction of a Pile and Pile End Soil

Dynamic response of a pile considering the interaction of pile variable cross section with the surrounding layered soil

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