Torsional complex impedance of pipe pile considering pile installation and soil plug effect

Zhang, Yunpeng; Yang, Xiaoyan; Wu, Wenbing; Naggar, M. Hesham El; Jiang, Guosheng; Liang, Rongzhu

doi:10.1016/j.soildyn.2019.106010

Cited by 43 publications

(24 citation statements)

References 35 publications

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“…e main areas of research on high rock slopes mainly include geological conditions, stability analysis methods, control standards, reinforcement design, implementation control, and their effects in different conditions [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Zhang

Wang

et al. 2021

Advances in Civil Engineering

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Cataclastic rock masses with multiple failure modes and mechanisms are critical geological problems in the construction of rock slopes. Cataclastic rock masses are widely distributed in slopes of a hydropower project located on Lancang River, which is located in Tibet, China. In this study, the potentially unstable block of the slope is divided into key block and secondary key block based on the key block theory, and the system reliability evaluation theory is introduced. The method for quantitatively analyzing the rock mass stability of cataclastic slopes with sliding failure is established. Then, the spatial distribution of cataclastic rock masses and discontinuities in several rock slopes of a hydropower project are determined using traditional geological surveying and 3D laser scanning. At last, combining the BATE 2.0 software and the stereographic projection of the vector, the proposed method is applied to the study area. The results show that the main failure mode of the studied slope is wedge failure, and the system reliability is 1.69. With the increase in the instability probability of the key block, the increase in the instability probability of the system block is obvious, which reflects the controlling effect of the key block on the stability of the system block. The calculated system instability probability is slightly larger than the key block instability probability.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Zhang

Wang

et al. 2021

Advances in Civil Engineering

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“…Furthermore, they simplified the inner soil as a spring in a subsequent study [8]. On this basis, some researchers [26,47,48,55] came up with the concept of the additional mass model in which the mass of the inner soil is connected to the pile shaft by cascading with a Voigt model. There still exist some deficiencies in these above-mentioned models regardless of their simplicity and convenience.…”

Section: Introductionmentioning

confidence: 99%

“…Naturally, the disturbance of the inner soil should also be simultaneously considered to simulate the actual condition more closely. Some researchers such as Dotson and Veletsos [10], El Naggar [11] and Zhang et al [55] have paid their attention to this issue and contributed in some manner to the simulation of the radial inhomogeneity of the soil. In Dotson and Veletsos's study, the shear modulus of the disturbed zone can only change in a given way.…”

Section: Introductionmentioning

confidence: 99%

Influence of the inner soil on the torsional vibration of a pipe pile considering the construction disturbance

Gao

2021

Acta Geotech.

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This paper is concentrated on the influence of the inner soil on the torsional vibration of a pipe pile embedded in inhomogeneous soil. First, the soil-pile system is divided into several segments in the vertical direction in accordance with the layered properties of the soil and the inner soil-filled height. Then, the outer (inner) soil is further subdivided into finite vertical ring-shaped zones in the radial direction to simulate its radial inhomogeneity due to the construction disturbance. The dynamic equilibrium equation for each outer (inner) soil zone is solved, and the outer (inner) soil-pipe pile dynamic interaction is obtained. On this basis, the dynamic equilibrium equation for the pipe pile is solved by the Laplace transform and the recursive method is employed to derive the analytical solutions for the complex impedance and amplitudefrequency response of the twist angle at the pile head. The reliability of the proposed solutions is verified by comparisons with other solutions. Finally, a sensitivity analysis is performed to portray the influence of the inner soil on the torsional vibration of the pipe pile.

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“…After that, various types of nonreflective boundary zone model containing inner disturbed region and outer undisturbed homogenous region were proposed, in which the shear modulus of the inner disturbed region changes continuously in the radial direction [23][24][25]. Moreover, Li and Gao [26] and Zhang et al [27] studied, respectively, the vertical and torsional vibration characteristics of a pipe pile embedded in a radially inhomogeneous soil using the rigorous continuum soil model. However, these studies modeled the radially inhomogeneous soil as a viscoelastic medium.…”

Section: Introductionmentioning

confidence: 99%

Time-Harmonic Response of an Elastic Pile in a Radially Inhomogeneous Poroelastic Medium

Wang

Zhang

2021

Mathematical Problems in Engineering

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The time-harmonic response of an elastic pile embedded in a radially inhomogeneous poroelastic medium and subjected to a torsional loading is studied in the present article. In engineering practice, the surrounding soil may be weakened due to the disturbance effect caused by pile driving. To simulate the weakened surrounding soil, a boundary zone model with the complex shear modulus of the inner disturbed soil changing in a parabolic form along the radial direction is proposed. In view of the axis-symmetric deformation of the surrounding soil under torsional load, the equation of motion of the saturated soil is solved in the cylindrical coordinate system. The vibration displacement and shear stress solutions for the inner disturbed soil are gained by expanding the displacement as a power series, and those for the outer undisturbed soil are obtained by solving the partial differential equation. By virtue of continuity conditions at the interface between inner and outer soil regions, the torsional impedance of the radially inhomogeneous soil is solved. Then, via the boundary and continuity conditions of the pile-soil system, the twist angle and torque of the pile are obtained in the frequency domain. Finally, selected numerical results are conducted to investigate the influence of the material damping, softening degree, and softening range of the inner soil on the distribution of the twist angle and torque of the pile along the depth direction.

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Torsional complex impedance of pipe pile considering pile installation and soil plug effect

Cited by 43 publications

References 35 publications

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Influence of the inner soil on the torsional vibration of a pipe pile considering the construction disturbance

Time-Harmonic Response of an Elastic Pile in a Radially Inhomogeneous Poroelastic Medium

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