Geosynthetic-Reinforced Piled Embankments: Comparison of Numerical and Analytical Methods

Bhasi, Anjana; Rajagopal, K.

doi:10.1061/(asce)gm.1943-5622.0000414

Cited by 45 publications

(13 citation statements)

References 15 publications

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“…Most notably, the maximum tensions of each geogrid layer all occurred at the corner of the pile cap and give values of 4·3, 6·7 and 11·2 kN/m for the upper-, middle-and bottom-layer geogrids, respectively. The upper two layers of the geogrid were found to carry relatively little tension compared to the bottom layer, as also illustrated in the paper by Bhasi and Rajagopal (2014), implying less effective performance. Also observed is that the sum of the maximum tension for the three-layer geogrid is approximately identical to that of the single-layer geogrid.…”

Section: Settlement (C ) In the Geogridmentioning

confidence: 69%

“…However, full 3D numerical modelling can usually be very complicated, needs computers with a high processing power and also can be extremely time consuming depending on the complexity of the problem (Ariyarathne et al, 2012). Therefore, for practical limitation, many researchers have used the unit cell concept and 3D column model to study the performance of piled embankments (Bhasi and Rajagopal, 2014;Jenck et al, 2009;Yoo, 2010;Yoo and Kim 2009;Zhuang and Wang, 2015).…”

mentioning

confidence: 99%

“…Full 3D analyses are performed to study the stress concentrations developed at the edge of the pile, the tensile forces and strains developed in the geosynthetic layer (Abdullah and Edil, 2007;Bhasi and Rajagopal, 2014;Liu et al, 2007). However, full 3D numerical modelling can usually be very complicated, needs computers with a high processing power and also can be extremely time consuming depending on the complexity of the problem (Ariyarathne et al, 2012).…”

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confidence: 99%

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Multilayered low-strength geogrid-reinforced piled embankment

Wang

ZhuangYan

LiuHanlong

et al. 2018

Geotechnical Research

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Multilayered low-stiffness geogrids have been used in constructing embankments, but without full understanding of their true behaviour -for example, the construction of apartments in Northern Ireland failed due to the excessive and continuing deformation of the load transfer platform. This paper presents a numerical simulation of multilayered geogrid-reinforced piled embankments. It shows that the inclusion of geogrids can effectively help transferring stress from subsoil to the pile cap, particularly for stiffer geogrids. Although the maximum settlement is approximately identical, an embankment with a three-layer geogrid provides more uniform stress distribution on the surface of subsoil and results in less differential settlement through the embankment. The maximum settlement and the total tension in the geogrid are found to be dependent only on the total stiffness provided and not on the number of geogrid layers. The parametric study shows that the combination of very soft subsoil and a geogrid with low stiffness results in relatively large settlement and may cause intolerable geogrid strain. The pile spacing is also found to be the most sensitive factor influencing the maximum settlement of the subsoil. Finally, an analytical method is assessed and shows reasonable agreement with the numerical results.

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Section: Settlement (C ) In the Geogridmentioning

confidence: 69%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Multilayered low-strength geogrid-reinforced piled embankment

Wang

ZhuangYan

LiuHanlong

et al. 2018

Geotechnical Research

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“…Based on literature reviews, geometric data such as crest width and side slope are reported to be too limited. Researchers widely practice the study of critical [113][114][115], safe [116], and reasonable [117,118] embankment height as they believe that these parameters are factors that contribute to embankment stability, which is supported by study findings. The study conducted by Cui et al [119] further supports this statement as it found that the height of the embankment affects the cumulative settlement of the subsoil.…”

Section: Geometrymentioning

confidence: 75%

“…Fagundes et al [113] in their study used the calculations proposed by Filz et al [121], McGuire [119], and BS 8006 [123] to find that the critical height suitable for the construction of embankments built on soft soils strengthened by piles without reinforcements is 2.5 m. Bhasi and Rajagopal [114] found that the critical height with the effect of reinforcement modulus on maximum settlements is 5.6m. In this study, embankments stabilized using the geosynthetic reinforced pile method built on soft soils were analysed using the three-dimensional (3D) FEM.…”

Section: Height Of Embankmentmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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This paper presents an exhaustive review of the challenges faced in the construction of road embankments on soft ground and proposes a direction for future development. Frequently used techniques for soft ground improvement are discussed. The factors that contribute to the stability of the road embankment are reviewed by approach, results of past studies, and historical cases. The findings show that settlement, slope stability, and soil bearing capacity are all challenges to constructing the road embankment. Additionally, it is found that geometric data is a key factor in embankment design. Pre-loading with prefabricated vertical drain (PVDs) methods and lightweight fill were found to be widely used techniques in soft ground improvement. The information from this study can be used to develop design guidance systems, numerical modelling, and to give an overview and knowledge to other researchers who are or will conduct research in this field. Finally, future perspectives for research are related to predictions of factors that affect the stability of road embankment with an artificial intelligence approach. ABSTRAK: Kertas ini membentangkan ulasan kajian menyeluruh mengenai cabaran yang dihadapi dalam pembinaan benteng jalanraya di atas tanah lembut dan mencadangkan ke arah pembangunan kajian masa depan. Teknik-teknik penambahbaikan tanah lembut yang sering digunakan turut dibincangkan. Faktor- faktor yang menyumbang kepada kestabilan benteng jalanraya diulas dengan pendekatan kepada kajian lepas dan sejarah kes. Hasil kajian ini didapati bahawa enapan, kestabilan cerun dan keupayaan galas tanah merupakan cabaran dalam pembinaan benteng jalanraya. Selain itu, ia didapati bahawa data geometri merupakan faktor penting kepada rekabentuk benteng. Kaedah pra pembebanan dengan prefabrikasi saliran menegak (PVDs) dan isian ringan didapati teknik yang popular digunakan dalam pembaikkan tanah lembut masa kini. Maklumat dari kajian ini boleh digunakan untuk membangunkan sistem panduan reka bentuk, pemodelan berangka serta memberi gambaran dan ilmu kepada penyelidik lain yang sedang atau akan menjalankan kajian dalam bidang ini. Akhir sekali, perspektif masa depan untuk penyelidikan berkaitan ramalan faktor-faktor yang mempengaruhi kestabilan embankment jalanraya dengan pendekatan kepintaran buatan.

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Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

Mangraviti

Flessati

Prisco

2023

Num Anal Meth Geomechanics

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Piled foundations are commonly employed to reduce settlements in artificial earth embankments founded on soft soil strata. To limit the number of piles and, consequently, construction costs, popular is the use of geosynthetic reinforcements laid at the embankment base. Nowadays, the complex interaction between geosynthetics, piles and soil is not yet fully understood and, in the scientific literature, simplified displacement‐based approaches to choose reinforcements, pile diameter and spacing are missing. In this paper, the authors, starting from the critical analysis and theoretical interpretation of finite difference numerical results, introduce a new mathematical model to rapidly assess both (i) differential/average settlements at the top of the embankment and (ii) maximum tensile forces in the basal reinforcement. The model, conceived to reproduce the response of a pile belonging to the central part of the embankment, is the result of an upscaling procedure based on a suitable sub‐structuring of the spatial domain (an axisymmetric unit cell) and on the concept of plane of equal settlements. For the foundation soil, drained conditions are considered, the pile skin roughness is disregarded, and piles are assumed to get the rigid bedrock. As generalised kinematic variables average and differential settlements are employed, whereas as generalized static ones the embankment height and the geosynthetic axial force. The model is validated against field measurements (where layered foundation soil and pile caps are included) and an application example of the model, used as a preliminary design tool in a displacement‐based perspective, is finally provided.

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Geosynthetic-Reinforced Piled Embankments: Comparison of Numerical and Analytical Methods

Cited by 45 publications

References 15 publications

Multilayered low-strength geogrid-reinforced piled embankment

Multilayered low-strength geogrid-reinforced piled embankment

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

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