Arching and Deformation in a Piled Embankment: Centrifuge Tests Compared to Analytical Calculations

Girout, Romain; Blanc, Matthieu; Thorel, Luc; Fagundes, Diego de Freitas; Almeida, M. S. S.

doi:10.1061/(asce)gt.1943-5606.0001557

Cited by 29 publications

(10 citation statements)

References 21 publications

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“…have already been published in Fagundes et al (2017), Girout et al (2014) or Girout et al (2016). Initially developed during the French national project A.S.I.Ri (IREX, 2012), the MT device is used to investigate load transfer towards rigid inclusions either within embankments toward the rigid piles, into granular mattresses below a slab or into lime and cement treated soils (Okyay, 2010;Okyay and Dias, 2010).…”

Section: Experimental Campaignmentioning

confidence: 99%

“…Some standard and design guidelines like EBGEO (2011) have been examined by Blanc et al (2014), for which the vertical displacement of a GR strip between two piles is compared with the physical modelling results. Girout et al (2016) have carried out this comparison in the case of unreinforced piled embankment. Van Eekelen et al (2015) have validated their concentric arching model through a comparison between seven field tests and four small scale models.…”

Section: Introductionmentioning

confidence: 99%

“…The hydraulic load is kept constant and the geosynthetic reinforcement is placed below the embankment. Girout et al (2016) and Fagundes et al (2015) have used the MT device only for unreinforced piled embankment studies (e.g., without GR) and performed many tests to investigate embankment behaviour by varying the characteristics of the piled-embankment (thickness H, spacing s between the piles axis, and pile diameter d). The measurements obtained from the load sensors, placed inside the piles at the network center and used to obtain the mean load Fm, have been analyzed using the load transfer efficiency equation (Hewlett and Randolph, 1988)…”

Section: Introductionmentioning

confidence: 99%

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Geosynthetic reinforcement of pile-supported embankments

Girout

Blanc²,

Thorel³

et al. 2018

Geosynthetics International

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Rigid piles are used to reinforce soft soil base and increase embankment stability. This technique is improved by placing one or more geosynthetic reinforcement (GR) layers inside or at the base of the embankment. A series of 33 small scale models has been tested using a geotechnical centrifuge. Soft soil settlement is imposed by the downward displacement of a tray. First, a series of models is prepared to examine how the load transmitted to the pile network increases with the embankment thickness. For a same configuration, two identical models are prepared to test successively two different types of GR (Geosynthetic Reinforcement). Another approach consists in studying how the external surcharges applied on the embankment affect load transfer. The results show that, in comparison with the piled embankment, the load transfer is increased in the case of the Geosynthetic-Reinforced Pile-Supported Embankment (GRPSE) due to the membrane effect. The membrane effect is higher when the GR is stiff and its vertical distance from the pile is reduced. Numerical modelling reveals that, when adding a GR layer, the second GR has an effect only if punching is sufficient. However, the benefits of it could not be highlighted here.

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Section: Experimental Campaignmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geosynthetic reinforcement of pile-supported embankments

Girout

Blanc²,

Thorel³

et al. 2018

Geosynthetics International

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“…Load transfer occurs between part A and part B because of the shear resistance, resulting in an increase in stress in part A above the column and a decrease in stress in part B above the subsoil. This load transfer is also referred to as the soil arching effect (Iglesia et al, 2014;Girout et al, 2016;Huckert et al, 2016;Rui et al, 2016;Smith and Tatari, 2016;Villard et al, 2016;Ghazavi et al, 2018;Girout et al, 2018;King et al, 2018;Pham et al, 2018). Usually, a load transfer platform is constructed above the top of the columns to eliminate this differential settlement, and one or several layers of geosynthetic reinforcements (Shukla and Chandra, 1994;Hinchberger and Rowe, 2003;Rowe and Li, 2005;Ariyarathne et al, 2013;Abu-Farsakh et al, 2016;Zhao et al, 2016;Da Silva et al, 2017;Feng et al, 2017a;Ghosh et al, 2017aGhosh et al, , 2017b are sandwiched therein to strengthen the load transfer platform.…”

Section: Introductionmentioning

confidence: 99%

A closed-form solution for column-supported embankments with geosynthetic reinforcement

Zhao

Zhou

Geng

et al. 2019

Geotextiles and Geomembranes

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“…Van Eekelen et al (2013) proposed a new limit-state equilibrium model for piled embankments which is an extension of the model proposed by Hewlett and Randolph (1988) and EBGEO (2010). Several other researchers compared the results of existing analytical models with field or laboratory measurements (Chen et al, 2008;Chen et al, 2010;Briançon and Simon, 2012;Girout et al, 2016). Chen et al (2008) conducted experiments both with and without geosynthetics and compared the results of their experiments with existing analytical models, namely Terzaghi (1943) and Low et al (1994) and the original 2D equation of Marston and Anderson (1913).…”

Section: Introductionmentioning

confidence: 99%

Analytical study for double-layer geosynthetic reinforced load transfer platform on column improved soft soil

Ghosh

Fatahi

Khabbaz

et al. 2017

Geotextiles and Geomembranes

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The objective of this study is to propose a reasonably accurate mechanical model for double-layer geosynthetic reinforced load transfer platform (LTP) on column reinforced soft soil which can be used by practicing engineers. The developed model is very useful to study the behaviour of LTP resting on soft soil improved with conventional columns such as concrete columns, piles, and deep soil mixing columns. The negligible tensile strength of granular material in LTP, bending and shear deformations of LTP, compressibility and shearing of soft soil have been incorporated in the model. Furthermore, the results from the proposed model simulating the soft soil as Kerr foundation model are compared to the corresponding solutions when the soft soil is idealised by Winkler and Pasternak foundation models. It is observed from the comparison that the presented model can be used as a tool for a better prediction of the LTP behaviour with multi layers of geosynthetics, in comparison with the situation that soft soil is modelled by Winkler and Pasternak foundations. Furthermore, parametric studies show that as the column spacing increases, the maximum deflection of LTP and normalised tension in the geosynthetics also increase. Whereas, the maximum deflection of LTP and normalised tension in the geosynthetics decrease with increasing LTP thickness, stiffness of subsoil, and stiffness of geosynthetic reinforcement. In addition, it is observed that the use of one stronger geosynthetic layer (e.g. 1×2000 kN/m) with the equivalent stiffness of two geosynthetic layers (e.g. 2×1000 kN/m) does not result in the same settlement of LTP and the tension of the geosynthetic reinforcement when compared to two weaker geosynthetic layers.

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Arching and Deformation in a Piled Embankment: Centrifuge Tests Compared to Analytical Calculations

Cited by 29 publications

References 21 publications

Geosynthetic reinforcement of pile-supported embankments

Geosynthetic reinforcement of pile-supported embankments

A closed-form solution for column-supported embankments with geosynthetic reinforcement

Analytical study for double-layer geosynthetic reinforced load transfer platform on column improved soft soil

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