Geosynthetic reinforcement of pile-supported embankments

Girout, Romain; Blanc, Matthieu; Thorel, Luc; Dias, Daniel

doi:10.1680/jgein.17.00032

Cited by 54 publications

(13 citation statements)

References 29 publications

(43 reference statements)

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“…A few such analyses were presented in the literature [ 5 , 6 , 7 , 8 , 9 ], but they are very time-consuming. However, numerical analyses are often reduced to two dimensions by assuming plane strain conditions or axial symmetry when the behavior of one column is analyzed, e.g., [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Wijerathna and Liyanapathirana [ 18 ] compared numerical predictions from 2D-EA (two-dimensional model based on the equivalent area approach) and the 3D models and proposed a method to quantify the parameters for the EMC (an extension of the Mohr-Coulomb model) model simulating the column behavior when converting a 3D field embankment into a 2D-EA model or vice versa.…”

Section: Introductionmentioning

confidence: 99%

Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

2021

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When designing embankments on a soft ground improved with columns (rigid inclusions) and with a geosynthetically reinforced load transfer platform (LTP), the methods of determining strains in reinforcement reduce the spatial problem to a two-dimensional one, and analytical calculations are carried out for reinforcement strips in the directions along and across the embankment. In addition, the two-dimensional FEM models do not allow for a complete analysis of the behavior of the reinforcement material. The aim of this research was to analyze the work of the membrane in the 3D space modeling of the LTP reinforcement, depending on the interaction with the column, the shape of the column’s cap, the value of the Poisson’s ratio, the value of the stiffness of the elastic foundation (subgrade reaction k) modeling of the soft soil resistance between the columns and the load distribution over membranes that model the reinforcement. The membranes were modeled in the framework of the theory of large deformations using the finite element method and slender shell elements as three-dimensional objects. This modeling method allowed for the analysis of the behavior of the LTP reinforcement in various directions. The conducted analyses showed, among others, that in the absence of soil resistance between the columns, regardless of the shape of the cap (square, circle), the greatest strains are located near the edge of the cap in the diagonal direction between the columns.

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Section: Introductionmentioning

confidence: 99%

Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

2021

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“…Experimental studies on the influence of the end bearing condition and modulus of piles on the performance of GRPSEs of Shen et al [ 19 ] suggested that piles with relatively low modulus could increase the total settlement of bottom piles and foundation soil, and ultimately promote the lateral displacement of the embankment slope. In addition, many recent studies have extensively studies the critical factors that govern the load transfer mechanism and surface settlement of a GRPSE system, such as pile spacing, embankment height, pile cap size, GR stiffness and number of layers of geogrid [ 5 , 20 – 23 ]. Furthermore, Wang and Mei [ 24 ] found that the micro-piles can improve the stability and deformation characteristics of the soft soil foundation.…”

Section: Introductionmentioning

confidence: 99%

Calculation model and bearing capacity optimization method for the soil settlement between piles in geosynthetic-reinforced pile-supported embankments based on the membrane effect

Liu

Zhang

et al. 2021

PLoS ONE

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The geosynthetic-reinforced pile-supported embankment (GRPSE) system has been widely used in road construction on soft soil. However, the application of the GRPSE system is often restricted by its high-cost. The reason is that they are designed for bearing control as defined in the past. During the construction process, the pile spacing is reduced to meet the requirements for the embankment bearing capacity and settlement. These factors cause the membrane effect to not be exploited. As a result, the utilization efficiency of the bearing capacity of the soil between the piles is low and the project cost is high. Therefore, in order to solve the problem of insufficient bearing capacity of soil between piles, we established a settlement calculation model of soil between piles based on membrane effect. The model considers the relationship between the geosynthetic reinforcement (GR) and the pile spacing. Based on the obtained model, a method for optimizing the soil bearing capacity of GRPSEs is proposed. By controlling the settlement of soil between piles, the bearing capacity of soil between piles and the membrane effect of embankment can be fully utilized. Therefore, the project cost can be reduced. Finally, the method is applied to field tests for comparison. The results show that the method is reasonable and applicable. This method can effectively exploit the membrane effect and improve the utilization efficiency of the bearing capacity of the soil between piles. An economical and reasonable arrangement scheme for the piles and GR was obtained. This scheme can not only ensure the safety of the project, but also fully utilize the bearing capacity of the soil between the piles and provide a new method for engineering design.

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“…Recent composite foundation is widely used for the construction of embankments on soft ground [26,27]. Geosynthetics (such as geotextiles and geogrids) with high tensile strength, low elongation, and high stiffness are laid at the bottom of embankment which form reinforced cushion with gravel to maintain the integrity and continuity of the base [28][29][30]. Reinforced cushion and concrete pile constitute composite foundation of reinforced pile group.…”

Section: Introductionmentioning

confidence: 99%

Observed Performance of Highway Embankment over Soft Marine Clay: A Case Study in Wenzhou, China

Bian

Yan

Zhang

2020

Advances in Civil Engineering

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This paper presents a case history of observed performance of highway embankment over soft marine clay in Wenzhou, China. During the embankment construction, the changes of ground settlement, ground displacement, and lateral displacement of subsoil with the construction time were monitored and analyzed. The monitoring results indicate that the ground settlement and lateral displacement of subsoil account for about 75% in the process of embankment construction. The measured maximum values of ground settlement, ground displacement, and lateral displacement of subsoil are 37.88 mm, 21.50 mm, and 23.56 mm, respectively. After the completion of the embankment construction, the settlement gradually tended to be stable. It is suggested that the monitoring data of settlement and displacement of embankment are smaller than the design requirements, and the embankment stability is also ensured.

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Geosynthetic reinforcement of pile-supported embankments

Cited by 54 publications

References 29 publications

Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

Calculation model and bearing capacity optimization method for the soil settlement between piles in geosynthetic-reinforced pile-supported embankments based on the membrane effect

Observed Performance of Highway Embankment over Soft Marine Clay: A Case Study in Wenzhou, China

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