Geosynthetic reinforced piled embankment modeling using discrete and continuum approaches

Tran, Quoc Anh; Villard, Pascal; Dias, Daniel

doi:10.1016/j.geotexmem.2020.10.026

Cited by 15 publications

(5 citation statements)

References 33 publications

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“…In addition, the T slightly varies on the pile head. The higher value of T in close proximity to the head of pile reveals that the geogrid is firmly secured (full fixity) at the edge and experiences greater tension compared to the central section [60]. This observation suggests that a basal geogrid layer improves the load transfer mechanism to the rigid pile through effective tension mobilization.…”

Section: Resultsmentioning

confidence: 91%

Experimental and Computational Analyses of Sustainable Approaches in Railways

Farooq,

Meena,

Punetha

et al. 2024

Infrastructures

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Railway transportation is widely recognized as an environment-friendly and sustainable means for conveying freight and passengers over long distances. This article investigates the effectiveness of utilizing scrap tire rubber granules and geosynthetics to enhance track performance in response to the growing demands for railway transport and the consequent escalation of train-induced loading. A multi-faceted methodology, incorporating experimental, numerical, and analytical techniques, is employed to examine the efficacy of these sustainable approaches. Results from three-dimensional (3D) finite element (FE) analyses conducted on slab tracks for high-speed railways reveal that the addition of a resilient layer, comprising scrap tire rubber granules, reduces vertical stress within the track substructure. Laboratory investigations on an innovative composite material consisting of soil, scrap rubber granules, and polyurethane demonstrate its potential to enhance track performance. Findings from two-dimensional (2D) FE analyses conducted on pile-supported railway embankments highlight an enhanced transfer of load to the pile head following the installation of a geogrid layer at the embankment base. Finally, the results from the analytical approach indicate a reduction in track settlement and a decrease in the track geometry degradation rate on reinforcing the ballast layer with 3D cellular geoinclusion. The novelty of this study lies in the comprehensive assessment of the innovative composite material under drained and cyclic loading conditions, the investigation of the influence of train loading on geosynthetic tension and the load transfer mechanism in railway embankments, and the development of an innovative computational methodology capable of assessing the effectiveness of 3D cellular inclusions in improving the ballasted railway track performance. The findings from this article underscore the effectiveness of these sustainable approaches in mitigating the challenges posed by increased loads on railway tracks, providing valuable insights for the ongoing efforts to optimize railway transportation infrastructure.

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Section: Resultsmentioning

confidence: 91%

Experimental and Computational Analyses of Sustainable Approaches in Railways

Farooq,

Meena,

Punetha

et al. 2024

Infrastructures

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“…There are two major computational approaches to model pile-supported embankments. They are the continuum approach and discrete element modeling (e.g., [64][65][66]).…”

Section: Numerical Simulation Of Piled Embankmentsmentioning

confidence: 99%

“…The concept of coupling discrete and continuum methods to study the load-deformation behavior of pile-supported embankments, track substructure, and pavements has already been established in various forms in recent times [64,98,104,[107][108][109][110][111]. In this coupled modeling approach, a granular layer that is governed by the interaction of discrete aggregates is usually modeled by the DEM, which is then incorporated into a continuum mechanics approach such as the FEM to analyze the surrounding soil that has a much larger domain area.…”

Section: Comparison Of Modeling Approachesmentioning

confidence: 99%

“…Adopting the above-described concepts and numerical advances, Tran et al [64] very recently developed a coupled discrete-continuum model to study the load transfer mechanism of a geosynthetic-reinforced piled embankment, capturing the interaction between granular materials and geotextiles. In summary, the coupled discrete-continuum model is a promising numerical scheme for modelling pile-supported embankments as it fully utilizes both numerical approaches with acceptable computational effort and reasonable accuracy.…”

Section: Comparison Of Modeling Approachesmentioning

confidence: 99%

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A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

et al. 2021

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Searching for economical and practical solutions to increase any transport substructure’s protection and stability is critical for ensuring the long-term viability and adequate load-bearing capacity. Piles are increasingly being used as an economical and environmentally sustainable solution to enhance the strength of soft subgrade soils on which embankments are raised. As per the available literature, there are two main strategies used to explain railway embankments’ performance: experimental approaches and numerical simulations on a broad scale. The purpose of this study is to examine the state-of-the-art literature on numerical modeling methods adopted to assess the performance of pile-supported rail embankments subjected to cyclic loading. The paper addresses the main results from various numerical methods to explain the appropriate mechanisms associated with the load deformation response. It also presents the key issues and drawbacks of these numerical methods concerning rail embankment development while outlining the specific shortcomings and research gaps relevant to enhanced future design and analysis.

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“…Experimental studies [4,5,6,7,8] have indicated that geosynthetics, if properly selected, protect embankments from small cavities, and unidirectional geosynthetics with machine direction oriented along the direction of traffic are the most appropriate. Based on simple assumptions, geosynthetic shape, surface settlement, and tension within the geosynthetic can be calculated theoretically and design methods are proposed (BS8006 2010) [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Unidirectional Geosynthetic Reinforcement Design for Bridging Localized Sinkholes in Transport Embankments

2022

Mathematical Problems in Engineering

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The durability of foundations with localized sinkholes can be improved by geosynthetic-reinforced soil. Current design methods for geosynthetic-reinforced structures are based on the assumptions that the vertical load is distributed uniformly on the geosynthetic above the sinkhole and it corresponds to the geostatic stress in the anchorage area. In this study, a new analytical method is proposed to consider the ‘secondary arching effect’ and the vertical load distribution in the anchorage area due to the ‘arching effect.’ The influence of vertical load acting on the geosynthetic is analyzed based on three different cases. Results indicate that the increment of vertical load on the geosynthetic in the anchorage area has little effect on the maximum tensile force and surface settlement. Compared to a uniform load distribution on the geosynthetic above the sinkhole, the assumption of an inverse triangular load distribution can reduce the maximum tensile force and surface settlement. A new design method is proposed to determine the minimum geosynthetic stiffness to meet design standards. The obtained results verify the method as an applicable tool to meet the serviceability limit state and the ultimate limit state criteria.

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Geosynthetic reinforced piled embankment modeling using discrete and continuum approaches

Cited by 15 publications

References 33 publications

Experimental and Computational Analyses of Sustainable Approaches in Railways

Experimental and Computational Analyses of Sustainable Approaches in Railways

A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

Unidirectional Geosynthetic Reinforcement Design for Bridging Localized Sinkholes in Transport Embankments

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