Analysis of Features of Long and Short Pile Composite Foundation in High-Rise Buildings

Yang, Yong; Zhang, Jichao

doi:10.1007/s11204-022-09788-6

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…In recent years, lime-sand piles have often been used to treat loess foundations to eliminate their wet subsidence due to their special performance, and they are widely used in northwest China, Central Europe, and elsewhere [1][2][3]. They can also be used to deal with permafrost foundations as permafrost foundations and loess foundations are part of the nature of similar lime-sand pile water absorption processes which continue to progress toward exothermic reactions which can make a permafrost foundation melt; the melted water can be absorbed by the lime-sand pile again, and successive reactions can improve the reliability of the permafrost foundation and its bearing capacity [4,5].…”

Section: Introductionmentioning

confidence: 99%

Parametric Modeling and Numerical Simulation of a Three-Dimensional Random Aggregate Model of Lime–Sand Piles Based on Python–Abaqus

Yuan,

Si,

Qiao

et al. 2024

Buildings

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A lime–sand pile is a three-phase particle composite material composed of a lime matrix, sand, and a loess aggregate at the meso level. Establishing a random aggregate model that can reflect the actual aggregate gradation, content, and morphology is the premise of numerical simulations of the meso-mechanics of lime–sand piles. In this paper, the secondary development of Abaqus 2022 is realized by writing Python 3.12 scripts, and a parameterized three-phase mixed lime–sand pile random meso-spherical aggregate model is obtained. A meso-modeling idea of lime–sand piles is creatively proposed, the integrated-generation algorithm of a spherical aggregate of different materials is written, and the material’s properties and mesh generation are given by the algorithm. Finally, a numerical simulation of temperature–expansion statics is carried out using an established mesoscopic model. Under different mixing ratios, the expansion force increases with an increase in the lime proportion. The increase in the expansion force is approximately 45% of that without an increased lime proportion. The simulated expansion forces are 8.81 kN, 12.61 kN, and 18.89 kN, respectively, which are similar to the experimental results for laboratory specimens, and the relative error is less than 3%. In the case of different height ratios, with increases in height, the change in the expansion force is very small, and the relative error between the simulated value and the experimental value is less than 2%, which further verifies the reliability of the mesoscopic random model of lime–sand piles. The model can be used to guide the practical application of engineering.

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Section: Introductionmentioning

confidence: 99%

Parametric Modeling and Numerical Simulation of a Three-Dimensional Random Aggregate Model of Lime–Sand Piles Based on Python–Abaqus

Yuan,

Si,

Qiao

et al. 2024

Buildings

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“…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. Under the condition of a dynamic load, Jihui et al [17] used the fnite element analysis method to analyze the displacement and acceleration time-history curve of a rigid-fexible composite foundation under blasting load.…”

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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“…Duba et al [20] proposed a settlement calculation method considering the soil structural strength. By adopting the finite element method, field monitoring, and the analytical method, Yang and Zhang [21] analyzed the mechanism of long-short composite-piled foundations.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Guo

et al. 2023

Water

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The settlement behavior of composite foundations plays an important role in the serviceability and stability of the subgrade or other infrastructures supporting the foundation. However, in water-rich flood plains, due to the complexity of the soft soil properties, the settlement behavior has not been well understood. The objective of this study is to investigate the effects of various key factors on the settlement behavior of composite foundations with deep mixed piles supporting highway subgrade in water-rich flood plains. The investigated subgrade is in operation, and the vehicle load is taken into account. The G347AH Project is considered in this study. Several typical models for predicting composite foundation settlements are discussed. By performing three-dimensional finite difference analysis, a comparison is made between the settlement behavior of the natural foundation and the composite foundation with deep mixed piles. Based on the single factor sensitivity analysis and the multi-factor orthogonal experimental design, the effects of pile length, pile diameter, pile spacing, pile elasticity modulus, cushion elasticity modulus, and cushion thickness on the composite foundation settlement are captured. It is found that among these factors, the degree of influence of pile length is superior. The composite foundation settlements predicted by the models agree well with the field-monitoring data, with the error being about 8.42% and 6.38%, respectively, at two monitoring sections. The research conducted in this paper can effectively reduce the probability of various settlement-related disasters occurring on highway subgrades in water-rich flood plains. Moreover, the research has important theoretical guidance for design optimization in terms of settlement control of highway subgrades in soft soil areas.

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Analysis of Features of Long and Short Pile Composite Foundation in High-Rise Buildings

Cited by 6 publications

References 10 publications

Parametric Modeling and Numerical Simulation of a Three-Dimensional Random Aggregate Model of Lime–Sand Piles Based on Python–Abaqus

Parametric Modeling and Numerical Simulation of a Three-Dimensional Random Aggregate Model of Lime–Sand Piles Based on Python–Abaqus

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

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

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