Evaluation of Optimal Design Parameters of the Geogrid Reinforced Foundation with Wraparound Ends Using Adaptive FEM

Jaiswal, Sagar; Chauhan, Vinay Bhushan

doi:10.1007/s40891-021-00325-3

Cited by 16 publications

(4 citation statements)

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“…When applied to a shallow foundation, this condition is identified as the post peak in the force-displacements curve [37,56] or when the shear band below the foundation is completely formed [57][58][59]. Similar cases on soil dams' foundation are reported in [60][61][62][63].…”

Section: Rpe Structural Collapse Definitionmentioning

confidence: 76%

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Vigna,

Marchelli,

De Biagi

et al. 2023

Geosciences

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Rockfall events represent a significant hazard in mountainous regions, putting human safety and critical infrastructure at risk. Various mitigation devices are available, among which, Rockfall protection embankments (RPEs) located in natural soil are passive defense work suitable for high-energy and high-frequency events. Currently, limited research has been conducted in this area, with the Austrian standard ONR 24810 providing the sole codified design method. A parametrical analysis involving both the RPE geometry and the impact features was developed by Abaqus/Explicit FEM code, with 2270 cases overall. The research aims to identify conditions under which RPEs effectively stop falling blocks, focusing on two failure mechanisms: the block pass over the RPE after impacting the upstream side bank and the RPE structural collapse. Additionally, the interaction between RPEs and their foundations during the impact is explored. The results provide valuable insights into the dynamic behavior of these structures. In terms of design considerations, this study offers analytical equations to quantify crater depth and foundation stress induced by the impact. Furthermore, design charts are developed to assess the block passing over verification and the structural collapse verification.

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Section: Rpe Structural Collapse Definitionmentioning

confidence: 76%

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Vigna,

Marchelli,

De Biagi

et al. 2023

Geosciences

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“…Moreover, for assessing the effect of vertical nail spacing (S v ), four spacings of 1.25 m, 1.50 m, 1.75 m, and 2.0 m are considered, and horizontal spacing, (S h ), is maintained 1 m. The plane strain model is adopted here for analyzing the slope stability with PLAXIS. In this case, strain in the direction perpendicular to the plane section (which is also the largest dimension) is zero [57,58], and in this stability analysis it extends in a longitudinal direction for a considerable distance, so that a plane strain model is applicable. Fifteennoded triangular elements are used for modeling, by which failure load and safety factors The plane strain model is adopted here for analyzing the slope stability with PLAXIS.…”

Section: Finite Element (Fe) Modelmentioning

confidence: 96%

“…Fifteennoded triangular elements are used for modeling, by which failure load and safety factors The plane strain model is adopted here for analyzing the slope stability with PLAXIS. In this case, strain in the direction perpendicular to the plane section (which is also the largest dimension) is zero [57,58], and in this stability analysis it extends in a longitudinal direction for a considerable distance, so that a plane strain model is applicable. Fifteen-noded triangular elements are used for modeling, by which failure load and safety factors are correctly predicted, and for the Phi-c type of analysis in PLAXIS, the fifteen-node elements are technically better for the factor of safety calculations.…”

Section: Finite Element (Fe) Modelmentioning

confidence: 96%

“…A virtual thickness was assigned to the interface element in order to define the material characteristics. A virtual thickness factor (δ inter ) of 0.1 is used in the analysis to ensure proper soil-nail interactions, as mentioned in the literature by Rawat and Gupta [45], Jaiswal and Chauhan [57,58] and Islam et al [59]. While producing the mesh, this factor is multiplied by the element thickness, and the material properties of the interface are the same as the surrounding material.…”

Section: Finite Element (Fe) Modelmentioning

confidence: 99%

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Parametric Assessment of Soil Nailing on the Stability of Slopes Using Numerical Approach

Elahi

Islam

2022

Geotechnics

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This study focuses on the stability analysis of slopes reinforced by soil nailing. The effects of slope geometry and nail parameters on slope stability are investigated using PLAXIS 2D. Four different slope angles and three different backslope angles are considered for assessing the effect of slope geometry on the stability of a nailed slope. The factor of safety (FS) was found to decrease with the increasing values of the slope angle as well as the backslope angle. The influence of different nail parameters (nail inclination, nail length, and nail spacing) was also investigated. With the increase in nail inclination, FS was found to increase initially and thereafter, reaching a peak value followed by a drop in FS. The optimum nail inclination was found between 0 and 25° at a horizontal angle, depending on the different slope geometries, which is evident from observation of the slip surface as well. With the increase of nail length, FS increases; however, the increase was small after L/H (length of nail/height of slope) reached a value of 0.9. Moreover, increasing the length of the nail was found to be effective in reducing the lateral movement of the slope. The maximum nail forces are observed in the bottom-most row of nails and increase with the depth. The inclusion of soil nailing with optimum nail parameters can increase FS by 29–75% depending on the slope geometry, signifying the effectiveness of nailing.

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