A modified analytical solution of soil stress distribution for XCC pile foundations

Lv, Yaru; Liu, Hanlong; Ng, Charles Wang Wai; Gunawan, Anthony; Ding, Xuanming

doi:10.1007/s11440-013-0280-1

Cited by 32 publications

(5 citation statements)

References 14 publications

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“…The perturbation increases with the increase of root size. Similar extrusion effects have been found in studies of extruded piles and conical piles (Ghazavi 2007;Lv and Liu et al 2014). The friction resistance of the side wall and the reaction force at the bottom of the roots will be enhanced by the squeezing effect of the roots.…”

Section: Soil Squeezing Effect Of the Rootsupporting

confidence: 72%

“…With the continuous emergence of super high-rise buildings and long-span Bridges, the carrying capacity of simple pile is difficult to meet the needs of actual projects. A series of new pile structures, such as extrusion and expansion plate pile (Wei and El Naggar 1998), bamboo joint pile (Zhou and Gong et al 2015), X-type cast-in-place concrete (XCC) pile (Liu and Liu et al 2009;Chen and Liu et al 2010;Lv and Liu et al 2014;Singh and Patra, 2020;Zhou and Liu et al 2020) and conical pile have emerged (Vesic, 1961;Ghazavi, 2007;Yin and Sun et al 2009;Mu and Huang et al 2010;Malik and Kuwano et al 2019;Shen and Luo et al 2022). As a new type of foundation with variable cross-section, root pile was proposed by in 2006.…”

Section: Forewordmentioning

confidence: 99%

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Lateral response analysis of root piles in multilayered soils based on transfer matrix method

Renyi,

Yin,

et al. 2024

Preprint

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The response mechanism of root pile under horizontal load is still unclear. The present analytical model is established based on matrix transfer method to research the stress and deformation characteristics of root piles under horizontal loads, in which the influences of the root squeezing effect, pile-soil friction effect are taken into account, and the effective length of the root is studied in semi-infinite space soil. The deformation and mechanical response of the root pile were obtained by writing the response program on the MATLAB platform. The feasibility and reliability of the theoretical method were verified by experimental cases of root pile, even in the stage of large deformation. In a parametric study based on this numerical case, the existence of roots greatly improves the horizontal bearing capacity of root piles. The study shows that the horizontal bearing capacity of root piles increases along with the increase of the installation position of roots and the increase of the elastic modulus of soil. The lateral bearing capacity of root piles does not increase with the increase of root length, there should be one range value of length of roots.

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Section: Soil Squeezing Effect Of the Rootsupporting

confidence: 72%

Section: Forewordmentioning

confidence: 99%

Lateral response analysis of root piles in multilayered soils based on transfer matrix method

Renyi,

Yin,

et al. 2024

Preprint

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“…A new type of displacement pile, the XCC pile, has been developed recently in China. This type of pile has been used for soft ground improvement during highway and railway construction (Liu et al, 2014;Lv et al, 2014aLv et al, , 2014b. The special 'X' cross-section shape creates a pile with larger side surface per unit volume than for a conventional cylindrical or square pile.…”

Section: Definition Of the Xcc Pilementioning

confidence: 99%

Experimental and analytical study of X-section cast-in-place concrete pile installation effect

Zhou

Liu

Randolph

et al. 2017

International Journal of Physical Modelling in Geotechnics

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A new type of displacement pile, the X-section cast-in-place concrete (XCC) pile, has been developed recently in China. Extensive field and laboratory experiments are being undertaken in order to evaluate the soil displacements during pile installation. The paper describes laboratory arrangements and results of transparent soil model tests aimed at capturing the non-axisymmetric soil displacement field. Results from model tests using the XCC pile are presented to reveal the complete soil displacement patterns (a) in the horizontal plane, and (b) in vertical planes of symmetry. Based on results from the transparent soil tests, a modified cavity expansion model (MCEM) is proposed to predict the radial displacements in any vertical plane induced by XCC pile installation. The radial displacements predicted by the MCEM are compared with data from the transparent soil test and the field experiment. The results show reasonable agreement for all cases, with the proposed MCEM proving more suitable than the conventional (axisymmetric) CEM for predicting the radial displacements induced by XCC pile installation. It may therefore provide a basis in the future for developing predictions of stress changes and, ultimately, shaft capacity of the XCC pile in comparison to displacement piles of circular cross-section.

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“…In recent years, XCC piles, whose cross section consists of four concave arcs and four flat sides, have been increasingly used for the construction of highways and railroads in China 31 . Based on the Geddes solution, 32 Lv et al 33 . provided a modified Geddes solution that considers the effect of the cross‐sectional geometry; however, the analytical solution is limited to homogeneous soil and the assumption that the side resistance is uniform or varied linearly along the pile shaft.…”

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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A modified analytical solution of soil stress distribution for XCC pile foundations

Cited by 32 publications

References 14 publications

Lateral response analysis of root piles in multilayered soils based on transfer matrix method

Lateral response analysis of root piles in multilayered soils based on transfer matrix method

Experimental and analytical study of X-section cast-in-place concrete pile installation effect

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

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