3-Dimensional numerical modelling of geocell reinforced sand beds

Hegde, A.; Sitharam, T. G.

doi:10.1016/j.geotexmem.2014.11.009

Cited by 155 publications

(40 citation statements)

References 31 publications

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“…It can be argued that as the reinforcement depth increases, the footing applied pressures are distributed within the unreinforced soil above the reinforcement and the behavior of footing approaches that of a footing placed on reinforced soil. Dash et al and Sitharam and Sireesh reported similar results for geocell reinforcement in small-scale experiments [16,26]. As shown in Figure 12, for u/B > 0.3, the effect of reinforcement decreases and IF decreases with increasing u/B.…”

Section: Effect Of Reinforcement Depth On Scale Effectsupporting

confidence: 62%

“…Therefore, geocells made of perforated geomembrane plates with ultimate tensile strength of 15 kN/m were used in this study. Hegde and Sitharam used the geocell made of geogrid with ultimate tensile strength of 20 kN/m in their study [16,17]. The pocket size of geocell (d) is taken as the diameter of an equivalent circular area of the pocket opening (Ag).…”

Section: Geocell Layermentioning

confidence: 99%

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Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

2018

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The scale effect on bearing capacity of shallow footings supported by unreinforced granular soils has been evaluated extensively. However, the subject has not been addressed for shallow footings on geocell-reinforced granular soils. In this study, load-settlement characteristic of large square footings is investigated by performing large-scale loading tests on unreinforced and geocell-reinforced granular soils. The effects of footing width (B), soil relative density of soil (Dr), and reinforcement depth (u) have been investigated. The test results show that the scale effects exist in geocell-reinforced soils, like unreinforced soils, and the behavior of small-scale models of footings cannot be directly related to the behavior of full-scale footings due to the difference between initial conditions of tests and the initial state of mean stresses in the soil beneath the footings having different dimensions. Large footings create higher mean stresses in the soil, resulting in low soil friction angle and initial conditions of the test approach to the critical state lines. The results of tests indicate that model experiments should be conducted on low-density soil for better prediction of the behavior of full-scale footings, otherwise, the predicted behavior of full-scale footings does not seem conservative.

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Section: Effect Of Reinforcement Depth On Scale Effectsupporting

confidence: 62%

Section: Geocell Layermentioning

confidence: 99%

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

2018

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“…According to many researchers (Ho and Rowe 1994;Youwai and Bergado 2004;Bergado and Teerawattanasuk 2008;Reddy and Navarrete 2008;Abdelouhab et al 2011;Suksiripattanapong et al 2012;Abdi and Zandieh 2014;Golam et al 2014;Wang et al 2014;Damians et al 2015;Hegde and Sitharam 2015), numerical methods (i.e. finite-difference and finite-element methods) have been widely used for design and analysis of MSE structures.…”

Section: Introductionmentioning

confidence: 99%

Numerical parametric study on behavior of bearing reinforcement earth walls with different backfill material properties

Sukmak

Han

Sukmak

et al. 2016

Geosynthetics International

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This paper presents a numerical parametric study on behavior of bearing reinforcement earth (BRE) walls with different backfill properties using the finite-element method software PLAXIS 2D. The primary objective of this study was to improve the understanding of bearing stress, settlement, lateral earth pressure, and horizontal wall movement of BRE walls with different backfill materials. The second objective of this study was to evaluate the effects of various soil-structure interactions, foundations, and stiffness of reinforcements on horizontal wall deformations. The backfill materials consisted of four types of soil, which were mixtures of silty clay and sand at different fine contents of 2, 20, 40, and 80% by dry weight. The model parameters for the numerical simulation were obtained from the conventional laboratory tests and back-calculated from the laboratory pullout tests of the bearing reinforcement. The geotextile elements were used to model the bearing reinforcements by converting the contribution of friction and bearing resistances to the equivalent friction resistance, which was represented by the soil-bearing reinforcement interaction ratio, R inter . The values of R inter decreased following a polynomial function as an increase of fine content in the ranges of 0.65-0.38 and 0.75-0.40 for the numbers of transverse members, n = 2 and 3, respectively. The simulated bearing stress in the reinforced zone decreased from the front to the back of the wall because the BRE wall behaved as a rigid body built on the relatively firm foundation retaining the unreinforced backfill. The foundation settlement decreased from the facing of the wall to the unreinforced zone for all backfill properties due to the slight rotation of the wall. The relationship between the maximum horizontal wall movement and the fine content can be expressed by a polynomial function. The maximum horizontal wall movement significantly increased as the fine content increased. The excessive movement was realized when the fine content was greater than 45%. The increase of the fine content moved the location of the maximum wall movement higher up from the mid to the top of the wall. A numerical parametric study was conducted to investigate the soil-structure interaction, foundation, and stiffness of reinforcement. These parameters affected the horizontal wall deformation, which is especially important for serviceability of BRE walls. The knowledge gained from this study provides a preliminary guideline in predicting the behavior of BRE walls and may be used to investigate other BRE walls with different wall heights and features of bearing reinforcements.

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“…With reinforcement improve stability [3], increase capacity and reduced settlements and lateral deformation can be observed [4], [5]. Particularly, geocells with honeycomb threedimensional cell structures could provide containment of compacted fill soils [2], [3], [6]. With their increased applications research on their effect on soil stability also is needed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition we can't always depend on field studies for design calculations, which are often time consuming and costly. Yet, only a few numerical analyses have been carried out to determine the bearing capacity of geocell-reinforced soil [2], [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of the behaviour of model shallow foundations on geocell reinforced sand

Sanjei

Silva

2016

2016 Moratuwa Engineering Research Conference (MERCon)

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This paper focuses the development of a three dimensional numerical model to simulate the behaviour of geocell reinforced sand using PLAXIS 3D. Numerical modeling of the geocell has been an immense challenge due to their curved shape. Most of researchers used equivalent composite approach (ECA) to model the geocells. However, the composite method has a number of limitations, including the disregard of the effect of shape. The shape has a major influence in stress distribution. Hence a realistic model approach is essential to simulate the same experimental condition in numerical analysis. In this study, a 3D cad model was imported to PLAXIS 3D and modeled using geogrid structural element. Then the model was validated using experimental results where the results satisfied each other. Thereafter the depth that gives the highest carrying capacity was estimated using numerical and experimental result, which was found at depth(U) /width(B)<0.5 for a square pad footing.

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3-Dimensional numerical modelling of geocell reinforced sand beds

Cited by 155 publications

References 31 publications

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

Numerical parametric study on behavior of bearing reinforcement earth walls with different backfill material properties

Numerical modelling of the behaviour of model shallow foundations on geocell reinforced sand

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