Settlement Behavior of Composite Foundation with Deep Mixed Piles Supporting Highway Subgrades in Water-Rich Flood Plains

Liu, Shuang; Guo, Panpan; Li, Xian; Wang, Kai; Tang, Rui

doi:10.3390/w15112048

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Therefore the N0/wdEs increases almost linearly with the increase in l/d. Liu [45] obtained the same conclusion, namely that the pile length is the first factor that should be adjusted to reduce the settlement of the PCF. In contrast, for the flexible pile condition, the piles have shown a weaker load transfer ability, which means that the effect of l/d on the N0/wdEs is no notable, and the existence of the bedrock represents a controlling factor on the N0/wdEs Therefore, the N0/wdEs gradually decreases with l/d.…”

Section: Effects Of the Pile Length To Diameter Ratio L/dmentioning

confidence: 70%

The Vertical Behaviors of Dissimilar Pile Composite Foundations over Inclined Bedrock

Zhou,

Tan,

Yue

et al. 2024

Buildings

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Pile composite foundations (PCFs) have been commonly applied in reinforcement engineering to adjust the vertical stiffness of foundations, due to the displacement control design criteria for foundations. PCFs that have dissimilar pile lengths, located over inclined bedrock, have shown significantly different vertical behaviors from PCFs with equal pile lengths, placed over a semi-infinite medium. However, the vertical behaviors of dissimilar PCFs over inclined bedrock cannot be predicted with the current theoretical methods, although they have been widely adopted in engineering. An analytical method is proposed in this investigation to analyze the vertical bearing characteristics of dissimilar PCFs over inclined bedrock. A pile–soil system is decomposed into fictitious piles and extended soil, and then a control equation to determine the axial force along the fictitious piles is established, stemming from the compatibility conditions between them. The vertical behaviors of dissimilar PCFs can be obtained by solving the control equation with iterative procedures, and the equation is verified by two field load tests of single piles from the Honghe bridge and a numerical case. Then, the settlement and load transfer behaviors of 3 × 1 dissimilar PCFs and their influence factors are analyzed, and the results are as follows. (1) Obvious differences can be observed concerning the axial force distribution, settlement w, and load-sharing ratio (LSR) of each pile element for different pile–soil stiffness ratios (Ep/Es). (2) The LSR of pile 1 increases from 0.074 to 0.253 for the rigid pile and from 0.062 to 0.161 for the flexible pile condition when the cushion stiffness Kc changes from 1 × 104 kN/m to 3 × 108 kN/m. The non-dimensional vertical stiffness of the foundation, N0/wdEs, increases from 10.21 to 28.95 for the rigid pile condition and increases from 8.69 to 14.44 for the flexible pile condition, when Kc increases from 1 × 104 kN/m to 4 × 105 kN/m. (3) The neutral layer depth of the pile zn, the average settlement w, and the differential settlement wd of each element head decrease with Kc, and no negative friction zone exists (zn = 0 m) for all the pile elements when Kc> 2 × 105 kN/m. (4) The N0/wdEs decreases with the distance between the pile bottom and the inclined bedrock Δ. For the rigid and flexible pile conditions, the N0/wdEs is 22.16 and 13.48 for Δ = 1 m, and 13.13 and 10.10 for Δ = 8 m. The wd reaches 16.7 mm and 4.0 mm for Δ = 1 m and Δ = 8 m, respectively. (5) The N0/wdEs increases almost linearly with an increase in l/d for the rigid pile condition, and it gradually decreases for the flexible pile condition. The developed model can improve the design and analysis of PCFs located over inclined bedrock under vertical loading.

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Section: Effects Of the Pile Length To Diameter Ratio L/dmentioning

confidence: 70%

The Vertical Behaviors of Dissimilar Pile Composite Foundations over Inclined Bedrock

Zhou,

Tan,

Yue

et al. 2024

Buildings

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“…Orthogonal experimental design is a multi-factor and multi-level experimental design method, which aims to determine the optimal parameter combination through a limited number of experiments to achieve the optimization goal. It is an efficient, fast and economical experimental design method, which can greatly reduce the cost and time of experiments 21 – 23 .…”

Section: Orthogonal Experiments Of Squeezed Branch Pilesmentioning

confidence: 99%

Multi-objective design and optimization of squeezed branch pile based on orthogonal test

Wang,

Zhao,

Zhang

2023

Sci Rep

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In recent years, the emergence of the squeezed branch pile has presented a new avenue for civil engineering, offering a distinctive structure and favorable mechanical characteristics. Squeezed branch piles have strong compressive, uplift, and horizontal load resistance capabilities. Due to the existence of discs, the geometric parameters of squeezed branch piles are abundant but important. This article selects number of discs, disc diameter, disc squeeze angle, and disc spacing as the main influencing factors on the bearing capacity of squeezed branch piles and conducts a qualitative analysis of their mechanical properties. The aim of this article is to analyze the different bearing performances of squeezed branch piles through orthogonal experimental design, simulate test conditions using finite element software ABAQUS, obtain relevant data, and finally determine the weight ranking and optimal combination of influencing factors through range analysis to provide better guidance for engineering practices. Through multi-objective optimization design, six optimization objectives including compressive performance, compressive economic efficiency, uplift performance, uplift economic efficiency, maximum horizontal displacement and maximum bending moment of pile body were analyzed. The analysis methods used included comprehensive balance method, queue scoring method, principal component analysis method, entropy weight method, and analytic hierarchy process. The conclusions obtained are similar, and based on the judgment, the squeezed branch pile with 4 discs, disc diameter of 2.5D, disc squeeze angle of 35°, and disc spacing of 3D is considered as the optimal combination under consideration of all optimization objectives.

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Differential Settlement of Cement Fly-Ash Gravel and Cement–Soil Compacted Piles

Cheng,

Ding,

Gong

et al. 2024

Indian Geotech J

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Settlement Behavior of Composite Foundation with Deep Mixed Piles Supporting Highway Subgrades in Water-Rich Flood Plains

Cited by 5 publications

References 24 publications

The Vertical Behaviors of Dissimilar Pile Composite Foundations over Inclined Bedrock

The Vertical Behaviors of Dissimilar Pile Composite Foundations over Inclined Bedrock

Multi-objective design and optimization of squeezed branch pile based on orthogonal test

Differential Settlement of Cement Fly-Ash Gravel and Cement–Soil Compacted Piles

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