Similitude Conditions Modeling Geosynthetic-Reinforced Piled Embankments Using FEM and FDM Techniques

Jennings, Keith; Naughton, P.J.

doi:10.5402/2012/251726

Cited by 8 publications

(3 citation statements)

References 14 publications

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“…As a result, the full encasement of stone columns in an ESC soil is highly needed for avoiding the failures and other related weaknesses of the stone columns. The studies by earlier studies [ 1,6,38 ] show that stress distribution in soil mass due to applied load reduces with the increase in encasement length. The authors showed that the stifness of the used geosynthetic materials plays a great role in stress reduction in the ESC soil.…”

Section: Resultsmentioning

confidence: 99%

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Investigating the performance of stone columns in an extremely soft clay—A case study

Harelimana

Ping

Gao

et al. 2022

Structural Design Tall Build

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Summary Stone columns are used to improve soft soils; however, they fail through bulging, punching, and lateral expansion when the soil is extremely soft. The present study investigated the performance of stone columns in an extremely soft clay (ESC) through the addition of the appropriate geosynthetic materials. Field test was conducted for the foremost purpose of obtaining the optimal spacing between the consecutive stone columns and therefore prevents the failures of stone columns in ESC soils. The study further examined the failure modes of stone columns for the case of ESC soils. The computer programming software FLAC 3D was used for modeling and simulation, while Auto CAD was used to draw needed geometries of the case study. The results revealed that the full encasement of the stone column with suitable geogrids, optimal spacing, and proper design of cushion will enable the efficient use of stone columns as a composite foundation in ESC. The considered appropriate thickness of the cushion was found to be 30 cm, and this cushion helps the embedded soft clay soils to work together with the installed encased stone columns in ESC soils. The center‐to‐center (optimal) spacing between two consecutive stone columns showed optimal performance at distance S ≤ 5d of the diameter of the stone column. These findings show that stone column encased with suitable geogrids and optimal spacing will improve the bearing capacity, reduce settlement, and decrease the lateral deflection as well as hoop strain of the foundation.

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Section: Resultsmentioning

confidence: 99%

“…This phenomenon is called soil arching. [ 38 ] This study indicated how soil arching can be avoided in such a situation. When stone columns are encased with suitable geosynthetics and connected with a well‐designed cushion and optimal spacing between consecutive stone columns, the soil arching can be avoided.…”

Section: Methodsmentioning

confidence: 99%

Investigating the performance of stone columns in an extremely soft clay—A case study

Harelimana

Ping

Gao

et al. 2022

Structural Design Tall Build

View full text Add to dashboard Cite

show abstract

“…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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An Analysis of Floating Geogrid-Reinforced Pile-Supported Embankments Containing Deep Softened Soil

Wang

Li²,

et al. 2021

Arab J Sci Eng

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Similitude Conditions Modeling Geosynthetic-Reinforced Piled Embankments Using FEM and FDM Techniques

Cited by 8 publications

References 14 publications

Investigating the performance of stone columns in an extremely soft clay—A case study

Investigating the performance of stone columns in an extremely soft clay—A case study

Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

An Analysis of Floating Geogrid-Reinforced Pile-Supported Embankments Containing Deep Softened Soil

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