Nonlinear analysis of single pile settlement based on stress bubble fictitious soil pile model

Wang, Lixing; Wu, Wenbing; Zhang, Yunpeng; Li, Lichen; Hao, Ling; Naggar, M. Hesham El

doi:10.1002/nag.3341

Cited by 16 publications

(3 citation statements)

References 23 publications

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“…The earth beneath the pile foundation compresses and deforms due to the external load of the pile foundation, creating settlement, and the ultimate settlement S may be described as follows [31]:…”

Section: Soil Compression Settlementmentioning

confidence: 99%

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

Zhang

Shi³

et al. 2022

Applied Sciences

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A field pile loading test was carried out on the Peshawar–Karachi Motorway (PKM) project in Pakistan to show the settling mechanism of bored pile foundation in pulverized soil and the force characteristics of frictional resistance at the pile-soil interface. The changes in pile lateral frictional resistance and pile settlement during the loading-unloading process of test piles were measured and analyzed, as well as the load-settlement distribution characteristics of test piles in different soil layers, the distribution of test pile internal forces, and the changes in pile-soil relative displacement. It was established that there was considerable deterioration of pile lateral frictional resistance and residual deformation of pile tip displacement throughout the test pile load-settlement process, and the association between the pile-soil interface frictional resistance and pile-soil relative displacement was addressed. The results reveal that the frictional resistance at the pile-soil interface is directly connected to the nature of the soil layer, with a positive connection between the natural density, specific gravity, compression deformation, and the plastic index under immediate load, and a negative correlation between the natural moisture content, compression coefficient, and settlement variations after unloading. The load-settlement of the pile rose in a non-linear proportion during the loading-unloading operation, with a maximum settlement value at the pile top of 8.14 mm and a residual deformation at the pile bottom of 1.94 mm. The frictional resistance of the pile perimeter was distributed non-linearly throughout the pile depth, and the frictional resistance of the pile-soil interface was severely deteriorated at an embedded depth of 15 m, with the degradation degree of the silty soil layer being significantly smaller than that of the silty clay soil. The relative pile-soil displacement was positively linked with the lateral frictional resistance of the pile under the same load, and the correlation coefficient in silty soil was much greater than that in sandy soil.

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Section: Soil Compression Settlementmentioning

confidence: 99%

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

Zhang

Shi³

et al. 2022

Applied Sciences

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“…According to the layered characteristics of the PES and whether there is sediment or compaction at the pile end, FSP can be divided into several sections along the vertical direction; that is, the layered characteristics of the PES can be considered in the FSP model. In recent years, the FSP model was also utilized to study the torsional vibration and settlement problems of pile foundation [22,29,[41][42][43][44][45]. However, to popularize the model in engineering, the FSP model needs to be applied to more engineering cases to verify its rationality.…”

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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“…Experiments conducted by El Naggar and Wei [1,2], as well as Ghazavi and Ahmadi [3], showed that the horizontal and axial bearing capacities of TPs increased by 77% and 80%, respectively, compared with those of a CP with the same length and volume. The static bearing characteristics of TPs have been thoroughly investigated by many researchers [4][5][6][7][8]. In addition to bearing static loads, the TP is also often subjected to dynamic loadings arising from traffic, wind, waves, machine vibrations and seismic loadings, etc.…”

Section: Introductionmentioning

confidence: 99%

Horizontal Vibration Characteristics of a Tapered Pile in Arbitrarily Layered Soil

et al. 2022

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A tapered pile (TP) is a new type of pile with a good bearing capacity, and scholars have conducted in-depth research on its static bearing characteristics. However, there is relatively little research on its dynamic bearing characteristics. In this paper, the horizontal vibration behavior of a tapered pile in arbitrarily layered soil is studied. Utilizing the Winkler foundation model and Timoshenko beam model to simulate pile-surrounding soil (PSS) and a tapered pile, respectively, the horizontal vibration model of a tapered pile embedded in layered soil was built. The analytical solutions for the horizontal displacement (HD), bending moment (BM), and shear force (SF) of a tapered pile were derived, and then the solutions for the horizontal dynamic impedance (HDI), rocking dynamic impedance (RDI), and horizontal-rocking coupling dynamic impedance (HRDI) of pile head were obtained. Using the present solutions, the effects of soil and pile properties on the horizontal vibration characteristics of a tapered pile were systemically studied. The ability of a tapered pile–soil system to resist horizontal vibration can be improved by strengthening the upper soil, but this ability cannot be further improved by increasing the thickness of the strengthened upper soil if its thickness is greater than the critical influence thickness.

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Nonlinear analysis of single pile settlement based on stress bubble fictitious soil pile model

Cited by 16 publications

References 23 publications

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

Analysis of Load-Settlement Curve Based on Load Transfer at Pile-Soil Interface

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

Horizontal Vibration Characteristics of a Tapered Pile in Arbitrarily Layered Soil

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