Experimental Investigation of Geosynthetic‐Reinforced Pile‐Supported Composite Foundations under Cyclic Loading

Kai-fu, Liu; Yang, Yiguo; Wang, Lei; Xu, Jiapei; Xie, Xuansong

doi:10.1155/2020/8886131

Cited by 6 publications

(6 citation statements)

References 27 publications

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“…Train load is an instantaneous load related to train structure, track, and speed [21]. Al Shaer et al [22] pointed out that a single wheel load can be considered a train load, while a dynamic load is likely to be a cyclic sine wave load from a theoretical point of view.…”

Section: Test Loading Programmementioning

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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Section: Test Loading Programmementioning

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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“…The breakage of particles and the reduction of the particle size are the main mechanism dominating the constitutive behavior of crushable granular assemblies [2,3]. These microscale evolutions are of significant importance for their engineering applications, such as railway tracks [4], rockfill dams [5], embankments [6], displacement piles (Liu et al, [7,8]), landslides ([9]; Liu et al, [7,8]), and oil/gas recovery [10]. The particle size of the granular material plays a crucial role in determining the macroscale response of polydisperse assemblies, which is called the particle size effect.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Particle Size Effect of Crushable Granular Soils through DEM Simulations

et al. 2022

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The particle size plays an important role in the mechanical behavior of granular geomaterials. With respect to the crushable granular soils, the particle breakage under different pressures leads to the variation of the particle size distribution of soils. Therefore, it is essential to accurately model the particle fracture process to reproduce the key response of granular soils in the simulation. In this study, two simulated approaches, cluster method and replacement method, were performed to investigate the particle size effect for the crushable granular soils by three-dimensional (3D) discrete element method (DEM). DEM simulations were validated through the available results of diametric and oedometric compression tests with the help of the Weibull statistics. Based on the evaluation at particle and assemble-scale, it is found that both the cluster method and replacement method could simulate the particle strength and size dependence of sample failure with a good agreement with experimental results. The particle breakage phenomenon is also successfully modeled in DEM simulation and analyzed by the breakage index. Meanwhile, the computational efficiency was analyzed compared with two simulated methods. The findings in this study can provide a viable approach to investigate the particle breakage effect of the crushable geomaterials.

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“…According to the cycle stability diagram, the cycle stability criterion is divided into stable region, metastable region, and unstable region, and the corresponding limit values are obtained according to the test results. Liu [12] studied the deformation characteristics of composite foundation supported by geogrid piles under cyclic loading through a series of model tests, and analysed the effects of load, geogrid layers, pile types, and other factors on the performance of composite foundation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cumulative Damage Characteristics of Long Spiral Belled Pile under Horizontal Cyclic Loading at Sea

Liang

Zeng

Cao³

et al. 2021

Shock and Vibration

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In order to study the cumulative damage and failure characteristics of long spiral belled pile under horizontal cyclic loading of offshore wind and waves, a series of indoor experiments on single piles under horizontal cyclic load were carried out. The cycle times as well as load amplitude at the same frequency were considered during the horizontal pseudo-static cyclic tests. On the basis of the distribution of pile deflection, bending moment, and Earth pressure around the pile, the pile-soil interaction was comprehensively discussed. The cumulative energy dissipation characteristics were introduced to describe the damage of test piles. Meanwhile, the effects of load amplitude and cycle times on the cumulative damage of long spiral belled piles were discussed. A power function model for energy dissipation coefficient prediction under multi-stage cyclic load was proposed. The results show that the horizontal peak bearing capacity of long spiral belled pile is increased by 57.2% and 40.4%, respectively, as compared with the straight pile and belled pile under the same conditions. The horizontal displacement mainly occurs at the upper part of the pile. Under the condition of limited cyclic times, the load amplitude has more significant effect on the bearing characteristics of the long spiral belled pile. In contrast to the straight pile and belled pile, the long spiral belled pile has better energy dissipation capacity, and the rank of the energy dissipation capacity of these three piles is long spiral belled pile > belled pile > straight pile. The power function model can well reflect the cumulative damage characteristics of long spiral belled pile under horizontal cyclic loading, and there is a good linear relationship between power function model parameters and load amplitude. The energy dissipation coefficient of long spiral belled pile with diverse cycle times at different mechanical stages of test pile is analysed. Then, the recommended power function model parameters according to different failure stages are proposed. The verification example indicates that the prediction results are close to the measured values with a calculation error of 22%. The prediction model can provide a certain reference for the application of long spiral belled pile in marine structures.

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Experimental Investigation of Geosynthetic‐Reinforced Pile‐Supported Composite Foundations under Cyclic Loading

Cited by 6 publications

References 27 publications

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

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

Comparative Study on Particle Size Effect of Crushable Granular Soils through DEM Simulations

Analysis of Cumulative Damage Characteristics of Long Spiral Belled Pile under Horizontal Cyclic Loading at Sea

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