A parametric study of embankment supported by geosynthetic reinforced load transfer platform and timber piles tip on sand

Ikbarieh, Abdallah; Izadifar, MohammadAli; Abu-Farsakh, Murad; Voyiadjis, George Z.

doi:10.1016/j.trgeo.2022.100901

Cited by 16 publications

(5 citation statements)

References 20 publications

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“…In this study, a 2D FEM of GRPS embankments, created in PLAXIS 2D software, is used. As demonstrated in Ikbarieh (20) and Ikbarieh et al (21), the developed FEMs are able to reproduce the measurements of several field case studies closely, including those of the Paris case study by Brianc xon and Simon (2), the Shanghai case study by Liu et al (22), and the Japan case study by Chai et al (23). For simplicity, the model verification will not be repeated in this paper, but a brief description of the FEM is presented.…”

Section: Fe Modelmentioning

confidence: 90%

“…As for boundary drainage conditions, the left and right vertical boundaries were considered to be impermeable; the permeability of the bottom boundary depended on the specific case simulated, which was governed by ground conditions. More details on the FE model can be found in Ikbarieh et al ( 21 ).…”

Section: Fe Model and Design Methods For Grps Embankmentsmentioning

confidence: 99%

“…A full contact with reduction factor of 1 is usually considered between the geogrid and granular material as a result of interlocking between aggregate particles and geogrid aperture opening (e.g., [ 25 ]). The interface reduction factor for geotextile–geomaterials was adopted based on results of direct shear tests conducted in the laboratory ( 26 ), which were also adopted by Ikbarieh et al ( 21 ). The pile–soil interface reduction factor was selected based on the design chart presented in Aksoy et al ( 27 ).…”

Section: Fe Model and Design Methods For Grps Embankmentsmentioning

confidence: 99%

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Performance Evaluation of Design Methods for Geosynthetic-Reinforced Pile-Supported Embankments

Izadifar

Luo

Abu-Farsakh

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Geosynthetic-reinforced pile-supported (GRPS) embankments are widely used in soft soil regions to support roadways. Various design methods for GRPS embankments have been developed; however, engineering experience and recent research have shown that the performance of these design methods varies case by case. This paper systematically evaluates the performance of several empirical GRPS embankment design methods, which include the BS8006 method, the Nordic method, the EBGEO method, the FHWA method, and the CUR226 method. A preliminary assessment of these methods using three field case studies confirms that their performances differ from each other and from field measurements, the differences sometimes being quite significant. To enable a more systematic evaluation of the design methods, a validated finite element model (FEM) was first used to conduct a comprehensive parametric study considering typical soft soil conditions and various geometrical parameters, the results of which served as a baseline for the evaluation of the design methods. The efficacy, stress concentration ratio, maximum differential settlement, and maximum reinforcement tension were used as indicators for the method evaluation. The results show that, overall, the CUR226 method outperforms other design methods. The percentage difference between the CUR226 method and FEM can be as small as 5%, and the maximum value is 130%. It was also found that the Nordic method does not apply to small embankment heights, and that the BS8006 method provides a large overestimation of reinforcement tension when pile spacing is large (>4 ft) for all embankment heights considered.

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Section: Fe Modelmentioning

confidence: 90%

Section: Fe Model and Design Methods For Grps Embankmentsmentioning

confidence: 99%

Section: Fe Model and Design Methods For Grps Embankmentsmentioning

confidence: 99%

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Performance Evaluation of Design Methods for Geosynthetic-Reinforced Pile-Supported Embankments

Izadifar

Luo

Abu-Farsakh

et al. 2023

Transportation Research Record: Journal of the Transportation R

Self Cite

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“…To model the interaction behaviour between them, interface elements were used, which can be characterized by two parameter sets: between the geosynthetic and the granular pile and between the geosynthetic and the surrounding soft soil. The coefficient of sliding friction (μ) between the geosynthetic and the granular pile was chosen to be 0.5 (= 2/3 tan) [24][25][26], where the friction angle of the pile material to the interaction between the geosynthetic and the soft soil was assumed to be 0.3 (= 0.7 tan) [27][28], which is the friction angle of the soft soil. The parameters used in the numerical analyses are summarized in Table 1.…”

Section: Numerical Analysesmentioning

confidence: 99%

Analysis of Geosynthetic – Reinforced Stone Piles – Supported Embankments

RamazanBorujerdi

2023

J-SUE

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The low bearing capacity, high compressibility, and lack of lateral resistance of stone pile-supported embankments on soft clay deposits pose design challenges. To overcome these difficulties, geosynthetics have been widely favored by geotechnical engineers in recent years. A two and three dimensional (2D, 3D) finite element model study that simulates a geosynthetic-reinforced and geosynthetic-encased stone pile-supported embankment on soft ground is presented in this paper. To study the effect of reinforcement and encasing on the vertical displacement of stone piles and soft soil, numerical analyses are performed. The results show a significant reduction in settlement with the casing, which is believed to be a direct result of the additional containment pressure created by the geosynthetic casing. With the help of soil reinforcement, the surface settlement values of the soft soil could be significantly reduced.

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“…In the last few decades, a reasonably expensive improvement technique using geosynthetic-reinforcement combined with pile-supported (GRPS) embankments was proposed in construction practice (Chai et al ., 2015; Fagundes et al ., 2017; Fons et al ., 2019; Liu et al ., 2020; Pham et al ., 2020; Wang et al ., 2019; Lang et al ., 2022; Deng et al ., 2023; Guo et al ., 2023a, b). The geosynthetic-reinforced traditional platform layer made of gravel and sand is a critical part of GRPS embankments (Liu et al ., 2020; Bhasi and Rajagopal, 2015; Han and Gabr, 2002; Rui et al ., 2019; Xu et al ., 2016; Ikbarieh et al ., 2023). The primary sources of the raw materials for the platform layer are the mining of rocks and river courses.…”

Section: Introductionmentioning

confidence: 99%

Settlement and stress analysis in stabilized slab- and pile-supported embankment based on double-equal settlement plane

Wang,

et al. 2024

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PurposeThe soft stabilized slab and pile-supported (SSPS) embankment is an improvement technique to increase the efficiency of resources in road construction. To capture the effects of stabilized slabs on the stress transfer mechanism, the differential settlements and the lateral displacement of the embankment completely. A theoretical model of SSPS is proposed by considering the effect of soil arching and the interaction between the embankment fill, stabilized soil, pile, foundation soil and bearing stratum.Design/methodology/approachIn the theoretical model, the stress and strain coordination relationship of the system was analyzed in view of the minimum potential energy theory and equal settlement plane theory. Subsequently, the theoretical method was applied to field tests for comparison. Finally, the influence of the elastic modulus and the thickness of the stabilized slab on the stress concentration ratio and foundation settlement were examined.FindingsIn addition to the experimental findings, the method has been revealed to be reasonable and feasible, considering its ability to effectively exploit the stabilized slab effect and improve the bearing capacity of soil and piles. An economical and reasonable arrangement scheme for the thickness and strength of stabilized slabs was obtained. The results reveal that the optimum elastic modulus was chosen as 28 MPa–60 MPa, and the optimum thickness of the stabilized slab was selected as 1.5 m–2.1 m using the parameters of field tests, which can provide guidance to engineering design.Originality/valueAn optimization calculation method is established to analyze the load transfer mechanics of the SSPS embankment based on a double-equal settlement plane. The model’s rationality was analyzed by comparing the settlement and stress concentration ratios in the field tests. Subsequently, the influence of the elastic modulus and the thickness of the stabilized slab on the stress concentration ratio and settlement were examined. An economical and reasonable arrangement scheme for the thickness and elastic modulus of stabilized slabs was obtained, which can provide a novel approach for engineering design.

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A parametric study of embankment supported by geosynthetic reinforced load transfer platform and timber piles tip on sand

Cited by 16 publications

References 20 publications

Performance Evaluation of Design Methods for Geosynthetic-Reinforced Pile-Supported Embankments

Performance Evaluation of Design Methods for Geosynthetic-Reinforced Pile-Supported Embankments

Analysis of Geosynthetic – Reinforced Stone Piles – Supported Embankments

Settlement and stress analysis in stabilized slab- and pile-supported embankment based on double-equal settlement plane

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