Working Behavior of Composite Ground under Flexible Foundations Based on Super-Substructure Interaction

Yu, Jianlin; Xiao-nan, Gong; Liu, Chao; Lv, Wen-zhi; Jing, Zi-jing

doi:10.1061/41025(338)10

Cited by 5 publications

(6 citation statements)

References 6 publications

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“…The above cases all indicate that sliding failure has become one of the main forms of damage for composite foundations. In response to the above situation, a large number of experts and scholars have conducted a series of research work, including theoretical research [16,17,18,19,20,21], numerical simulation [7,22,23,24,25,26,27,28,29], and experimental research [30,31,32,33,34,35,36,37,38,39]. In the aforementioned research work, Liu [36] simulated the deformation characteristics and instability sliding state of CFG pile composite foundation in the process of embankment filling through centrifuge tests (Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Feng,

Zhou

et al. 2024

Preprint

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When using pile composite foundation reinforcement for embankments in soft foundation sections, the embankment is prone to differential settlement, sliding, and even collapse. Based on the failure characteristics of pile composite foundation, this article proposes a reinforcement scheme using 'inclined-straight double-row piles' at the toe of the embankment slope. Through model tests, the deformation process, bending moment, and horizontal displacement of the pile body under lateral loading were compared for multiple sets of 'inclined-straight double-row piles'. Combined with numerical simulation analysis, the load-deformation characteristics and failure modes of the inclined-straight double-row piles under lateral loading were revealed, and a calculation analysis model was proposed to provide reference for the practical engineering application. The following conclusions were mainly drawn: (1) Under lateral loading, the inclined-straight double-row piles experience horizontal displacement, followed by bending deformation, with the inner piles failing first and the outer piles failing later, showing correlation. The failure load of the double straight piles falls between the inner and outer piles of the inclined-straight double-row piles. Increasing the bending stiffness of the inner piles and the inclination of the outer piles will significantly improve the overall stability. (2) When subjected to lateral loading, the inclined-straight double-row piles may experience overturning failure due to excessive lateral movement of the pile body or fracture failure due to excessive load on the pile body. (3) Calculation analysis models were developed for the overturning failure mode and pile body fracture failure mode.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Feng,

Zhou

et al. 2024

Preprint

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“…Scholars analyzed the formation mechanism and mechanical behavior of soil arches using the common composite modulus method of integral analysis and the element analysis method of the pile foundation. In addition, the pile-soil stress ratio was determined for different pile-soil parameters [13][14][15][16][17][18]. Some scholars introduced new analysis methods and examined the pile-soil composite foundation from different angles, thus improving traditional frameworks [19,20].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Pile-Soil Synergistic Mechanism of Composite Foundation with Rigid Long and Short Piles

Guo

Hou

et al. 2021

Mathematical Problems in Engineering

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The rigid long-short-pile composite foundation has been increasingly used as an effective and low-cost reinforcement method. The pile-soil interaction in this foundation type is more complicated than that in the equal-length pile composite foundation. In this study, several physical model tests were conducted to investigate the pile-soil synergistic mechanism of the rigid long-short-pile composite foundation. A comparative analysis was conducted of the static load test data of single-pile and long-short pile composite foundations to assess the load-bearing characteristics and stiffness evolution of the composite foundation and pile-soil unit. The result indicated a positive correlation between the pile length and the overall bearing capacity of the single-pile composite foundation. The overall stiffness of the four-pile composite foundation was lower than that of the single-pile composite foundation due to an increase in the areas of the soil stress and the pull-down effect caused by multiple piles. The long pile exerted a greater influence on the overall settlement than the short pile. In addition, the correction coefficients were obtained to determine the pile-soil stiffness of the four-pile composite foundation based on that of the single-pile composite foundation, providing a theoretical reference for the optimal design of composite foundations.

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“…However, these studies failed to consider the relative displacement between the pile and soil. Lv et al [14] and Yu et al [15] assumed that the pile-soil interface had relative displacement, and the settlement difference between the soil and pile at the same depth, modifying Alamgir displacement model, and deducing the analytic solution of the working characteristics of the composite foundation under the flexible foundation. In 2011, Yu et al [16] improved on the assumption of the linear distribution of the side friction of a pile along the depth, using the nonlinear distribution of skin friction of the pile along the depth.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al [23], Yang et al [24], and Zhao et al [25] performed a comprehensive analysis of the effect of a reinforced cushion on the pile-soil stress ratio and derived the calculation of the pile-soil stress ratio and settlement of the pile-net composite foundation. Currently, the main problem in the study of pile-soil stress calculations is that the pile or soil is assumed to be an elastomer [5][6][7][8][9][10][11][12][13][14][15][16], which is obviously not realistic. In this paper, it is assumed that the soil satisfies the modified Cam-clay model, the constitutive behaviour of the cement-soil pile is introduced to describe the nonlinearity of the pile, and an equation is established to perform the calculation of pile-soil stress based on the fact that skin friction of the pile shaft and the relative displacement conforms with elastic-plastic relations.…”

Section: Introductionmentioning

confidence: 99%

“…In 2011, Yu et al [16] improved on the assumption of the linear distribution of the side friction of a pile along the depth, using the nonlinear distribution of skin friction of the pile along the depth. e paper [5][6][7][8][9][10][11][12][13][14][15][16] performed a study of the pile and soil, assuming them to be an elastic material, which was different from the nonlinearity of materials in practice. erefore, Qin et al [17] adopted the load-settlement hyperbolic model to analyse the pile-soil stress ratio.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Stress Analysis of Flexible Pile Composite Foundation by Energy Method

et al. 2018

Advances in Materials Science and Engineering

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To calculate the stress of cement-soil pile (flexible pile) in composite foundation accurately and overcome the defective preposition that the pile and the soil are elastic, the nonlinear analysis and calculation of pile-soil stress by adopting the energy method are performed. First, on the basis of the universally adopted load transfer method, it is assumed that the friction and the relative displacement of the pile shaft conform with the elastic-plastic relationship. en, the modified Cam-clay model is introduced to calculate the compressive amount of soil around the pile. Further, the stress and strain characteristics curve of the flexible pile is used to calculate the compression of the pile, deducing the energy equation of the pile and soil around the pile, establishing the total potential energy expression of the flexible pile composite foundation, and the load sharing value and the corresponding stress value of the pile-soil are obtained based on the minimum potential energy principle. Finally, this method is verified by indoor laboratory model test and the reported case. e results show that the calculated solutions are in agreement with the measurements; therefore, the calculation method is reasonable.

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Working Behavior of Composite Ground under Flexible Foundations Based on Super-Substructure Interaction

Cited by 5 publications

References 6 publications

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Experimental Study on the Pile-Soil Synergistic Mechanism of Composite Foundation with Rigid Long and Short Piles

Nonlinear Stress Analysis of Flexible Pile Composite Foundation by Energy Method

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