Analysis of Deformation Characteristics of Long‐Short Pile Composite Foundation in Salt Lake Area, Iran

Liu, Wei; Yang, Xiaohua; Zhang, Shasha; Kong, Xiangxin; Chen, Weizhi

doi:10.1155/2019/5976540

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…Assessing earlier research indicates that increasing the ratio of long to short pile length for a given length of long pile increases the pile-soil stress ratio of the short pile while reducing the same for the long piles [56]. On the other hand, the formation level of excavation with respect to the depth of pile tip affects the response of pile to neighbouring excavation [51], and for short piles as compared to long ones, excavation-induced pile settlement is likely to be a significant factor than lateral pile deflections [21].…”

Section: Effect Of Pile Tip Locationmentioning

confidence: 90%

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

Uge

Guo

Liu

2021

Advances in Civil Engineering

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The stress and displacement boundary conditions of excavation retaining structures affect the deformation mechanism and movement of the retained soil mass. The soil movement disturbs the load sharing performance and structural integrity of cement-fly ash-gravel (CFG) pile composite foundations existing in the vicinity, which merits considerable research work. This article presents results from 3D finite element analyses performed to study the influence of retaining wall rotation on the load sharing characteristics of adjacent CFG pile composite foundation comprising long and short piles. To verify the numerical model, a relatively large-scale 1 g physical model test was conducted. It is revealed that to arrive at a new static equilibrium during progression of wall rotation, the percentage load sharing ratios of the long and short piles change increasingly while the load proportion carried by the upper soil reduces remarkably. The percentage load sharing characteristics of CFG pile composite foundation are more affected in immediate proximity to the wall than those located at far distance. For the foundation having 3 × 3 long and short piles placed at 3.0–15.0 m away from the wall, the location resulted in a reduction of soil bearing capacity ranging between 1.4 and 7.5% of the total imposed load while the corresponding increase in the % load borne by the long and short pile range was 0.83–4.15 and 0.59–3.36%, respectively. For the other parameters considered in this article viz. pile spacing, subsoil stiffness, cushion stiffness and thickness, and applied working load, the increment in % load sharing of the long and short pile range was 3.45–4.15, 1.3–5.79, 1.48–3.36, 4.15–4.79, and 3.67–4.15% and 3.36–4.67, 1.43–4.99, 1.48–3.36, 3.36–3.64, and 1.38–3.36% of the imposed load, respectively. Moreover, the long piles’ load sharing proportion was higher than that of short piles, and peripheral piles received larger load proportion.

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Section: Effect Of Pile Tip Locationmentioning

confidence: 90%

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

Uge

Guo

Liu

2021

Advances in Civil Engineering

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“…Qian and Zhang and Guo et al [13,14] showed that the infuence of a long pile on the overall settlement is greater than that of a short pile by diferent research methods. Based on the shear displacement method, Liu et al [15] studied the infuence of pile spacing on longshort pile composite foundation by the centrifugal model test and numerical simulation and put forward a reasonable range of pile spacing. Yang and Zhang [16] used fnite element analysis, a feld test, and the standard formula calculation method to analyze the infuence of cushion thickness, pile length, and raft thickness on the axial force and side friction resistance of long piles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Dynamic Characteristics of a New Long-Short Pile Composite Foundation under Long-Term Train Load

Zhao-rong¹,

Guan

Han³

et al. 2023

Shock and Vibration

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Long-short pile composite foundation (PC-LSPCF) composed of part-screw pile and cement-soil compaction pile is a new railway foundation treatment method, which has been widely used in high-speed railway construction projects in China. To explore the dynamic characteristics and deformation characteristics of railway PC-LSPCF under long-term train loads, the dynamic characteristics of long piles, short piles, and soil between piles under long-term train loads are tested by an indoor dynamic model test. The dynamic amplification of pile and soil under dynamic load and the temporal and spatial distribution of peak response are analyzed, and the stress and deformation development mechanism of PC-LSPCF under cyclic loading of large-cycle trains is revealed. The results show that the neutral point of the long pile is at 1/2 of the pile length and that of the short pile is at 3/8 of the pile length. The part-screw pile has a certain absorption effect on vibration energy. The deformation of a long-short pile composite foundation under long-term train loads can be divided into three stages: extreme growth, transition, and stability. The train speed is negatively correlated with the cumulative settlement of the long-short pile composite foundation. The higher the train speed, the smaller the cumulative settlement, and the smaller the number of cycles of the N-S curve entering the gentle period. As the number of train cyclic loads increases, the load-sharing relationship of the long pile-short pile-soil system will be redistributed. The research results have important reference significance for the optimization design of high-speed railway foundation treatment.

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“…Some scholars introduced new analysis methods and examined the pile-soil composite foundation from different angles, thus improving traditional frameworks [19,20]. Furthermore, researchers conducted field tests [21][22][23] and indoor model tests [24,25] to obtain the working characteristics and evolution of the parameters of composite foundations under different geological conditions, different cushion thicknesses, and different pile conditions. e interaction between the rigid pile composite foundation and the base was analyzed.…”

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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Analysis of Deformation Characteristics of Long‐Short Pile Composite Foundation in Salt Lake Area, Iran

Cited by 8 publications

References 26 publications

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

Experimental Study on the Dynamic Characteristics of a New Long-Short Pile Composite Foundation under Long-Term Train Load

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

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