Simplified Approach for Settlement Analysis of Vertically Loaded Pile

Xia, Zhang-qi; Zou, Jinfeng

doi:10.1061/(asce)em.1943-7889.0001334

Cited by 12 publications

(4 citation statements)

References 37 publications

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“…After the energy piles were operated for 28 d, the measured temperature values upstream of the seepage under the in situ test condition were 32. 25 The temperature change rates upstream and downstream of the seepage were 12%, −4%, 12%, 9%, 15%, 1% and 0% in order from shallow to deep. Under the numerical simulation condition, the temperature probe was used to extract the temperature values of the pile body, and the measured temperature values upstream of the seepage were 35.16, 34.72, 34.58, 31.30, 30.61, 20.00 and 20.00 • C from the shallow layer to the deep layer, and the measured temperature values downstream of the seepage were 35.87, 35.32, 35.07, 34.24, 33.45, 20.00 and 20.00 • C from the shallow layer to the deep layer, respectively.…”

Section: The Evolution Of Temperature In Pile and Surrounding Soilmentioning

confidence: 92%

“…The softening phenomenon during the shear process of pile-soil contact surface was observed [22], and the softening phenomenon of the soil on the pile side leads to a decrease in the rate of change of the pile axial force along the depth [23]. Therefore, Zhao et al [24] proposed a load transfer model under softening and, based on this model, derived the equation for the relationship between pile top load and settlement; Xia et al [25] proposed a nonlinear method to represent the relationship between pile lateral friction resistance and displacement by means of a nonlinear model in the form of a segmented function; Ni et al [26] derived a load transfer model considering both hardening and softening effects; Suryatriyastui et al [12] proposed a load transfer model considering cyclic hardening and softening. Further research found that the shear properties of pile-sand contact surface were affected by cyclic temperature loading but not by constant temperature loading and that the shear strength increased with increasing temperature [27,28].…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

Wang,

Zhao,

et al. 2024

Applied Sciences

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In this paper, a finite element numerical model of thermal-hydro-mechanical of energy piles under multi-layer geological conditions was established, and field tests of ultra-long energy pile (1000-mm-diameter, 44-m-long) were carried out to reveal the temperature distribution and mechanical properties of energy pile under typical working conditions. Based on the analytical results, a softening shear model of the energy–soil interface under the condition of large shear displacement was proposed with the load transfer method, and the reliability of the model was verified. The model can simulate the shear–displacement relationship of the pile–soil interface under different geological conditions.

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Section: The Evolution Of Temperature In Pile and Surrounding Soilmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

Wang,

Zhao,

et al. 2024

Applied Sciences

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“…Zhou et al 21 and Chen et al 22 improved the fitting analysis program by introducing new parameters, such as radiation damping, residual stress and pile tip crack in soil model, and the softening performance of pile end bearing layer, etc. Meanwhile, Xia et al 23 proposed a novel research idea in high-strain dynamic testing, and considered the hammer-pile-soil system as a unified entity. The piling process of a diesel hammer is simulated using the enhanced continuous model and the optimized discrete mass elastic model.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Yu,

Cao,

Zhao

2023

Sci Rep

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The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test piles, each with a length of 15 m and a diameter of 1.0 m, were poured based on the actual bridge construction project in the permafrost region of Daxing'an Mountains in China. Based on the temperature data between the piles and soil, the refreezing state of the pile foundation was comprehensively judged. Subsequently, the static method was employed to assess the friction resistance values and single pile bearing capacity of each soil layer on the pile side under different freezing states before and after the pile foundation refreezing. Building upon these findings, the restrictive parameters for soil elastic limit $$q_{(i)}$$ q ( i ) , soil resistance $$R_{U} (i)$$ R U ( i ) and other parameters in the pile-soil model of high-strain dynamic test method are clarified. The test and analysis results indicate that under the condition that the ground temperature of frozen soil is about − 1.9 °C, the pile-soil refreezing takes about 120 days, and the pile-soil refreezing is a slow process; In CAPWAPC calculation program, after the values of soil parameters were constrained by the results of static-load test, the calculated curve is in satisfactory agreement with the measured curve, and the parameters of the pile-soil model are reliable, which can be used for the rapid detection of the ultimate bearing capacity of piles in permafrost regions; In the process of pile-soil refreezing, the change of temperature field affects the freezing strength between pile and soil, the process of pile-soil refreezing is positively correlated with the increase of pile foundation bearing capacity.

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“…The load transfer behavior and prediction of conventional circular piles’ settlement have attracted the interest of many geotechnical researchers over the past few decades, 10–13 and there are some typical analytical methods that can be used. The main calculation models of the circular pile‐soil system are the load transfer method, 14–18 elastic continuum approaches 19,20 based on Mindlin's solution, 21 and variational methods 22–27 . For axially loaded noncircular piles, however, the equivalent circular pile has often been used as an alternative solution (e.g., Poulos et al 28…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional analytical continuum model for axially loaded noncircular piles in multilayered elastic soil

Zhou

Liu

et al. 2021

Num Anal Meth Geomechanics

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To investigate the settlement response, load transfer behavior, and geometric effect of noncircular piles, a general three‐dimensional (3D) analytical continuum model for axially loaded noncircular pile‐multilayered homogeneous soil systems is presented. In the analysis, both the vertical and horizontal soil displacement fields are considered, and the variations of the soil displacement components are described by the three displacement transfer functions along the x, y, and z directions. The governing differential equations of noncircular piles and soil are derived by applying the principle minimum potential energy and variational method to the pile‐soil system. A complex variable function conformal mapping technique is introduced to overcome the complex boundary conditions of the transfer functions. Then, the numerical solutions of all the governing differential equations are simultaneously solved following an iterative algorithm. The reliability of this approach is validated by comparing some pile and soil responses with the results from existing analytical solutions or a rigorous finite element analysis. Differences in the settlement response and the axial force distribution between noncircular and circular piles are observed. In addition, the pile shaft resistance along the perimeter of the cross‐sections shows that a greater load is required in order to fully mobilize the ultimate resistance of the noncircular piles. We also compare the stress (σ1−σ3) contours of some typical noncircular piles with a circular pile, which provides useful insights into the geometric effect.

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Simplified Approach for Settlement Analysis of Vertically Loaded Pile

Cited by 12 publications

References 37 publications

A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Three‐dimensional analytical continuum model for axially loaded noncircular piles in multilayered elastic soil

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