A Contact Model Coupling Friction and Adhesion: Application to Pile/Soil Interface

Terfaya, Nazihe; Berga, Abdelmadjid; Raous, Michel; Abou-Bekr, Nabil

doi:10.15866/irece.v9i1.14034

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…Actually, in the research area, we focus our interest on similar questions through parallel research in finite element simulation of hydromechanical coupling in soil-structure-environment [29] and the simulation of soil-structures interfaces [30] that need numerical data of soils materials. Particularly, direct shear is a simple and inexpensive test to characterize the mechanical properties of interfaces in soil-structure interaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size and Distribution on Mechanical Behavior of Dune Sand

Boudia

Berga

2021

Civ Eng J

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Sand is a major component of soils. It is widely used in manufacturing and construction. In geomechanics, one characterizes sand according to various aims. This paper investigates, for local sands, the effect of grain size and granular distribution on the mechanical behavior in terms of strength and stress-strain relationship. For this purpose, dune sands of the great Occidental Erg, from Algeria, are analyzed, according to the Mohr-Coulomb criterion. The study uses three kinds of sands. Every kind is divided into three sizes classes. Then, the experimental program conducts a set of direct shear tests, under various vertical stresses, using the small shear box (60 × 60 mm). The results show that the particle size and distribution have a direct effect on the mechanical behavior of the dune sand. Then, the dominant size class governs the natural sand behavior. Moreover, the peak shear strength increases as particle size increases. This indicates that there is an increase in peak friction angle with the increase of particles size and the sands consider as a purely cohesionless material. In addition, the experimental analysis shows that density and confinement stress is not sufficient to interpret the mechanical behavior. Indeed, mineralogy and surface state can influence the shear strength. These conclusions lead to the relevance of the sand genesis and the importance of the local materials thematic. Doi: 10.28991/cej-2021-03091730 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Effect of Grain Size and Distribution on Mechanical Behavior of Dune Sand

Boudia

Berga

2021

Civ Eng J

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“…Normally, when two contact surfaces contact each other and slide or move relative to each other, there will be normal contact stress and shear stress between the two contact surfaces. For tangential effect, a commonly used friction model in ABAQUS is Coulomb friction [22,23]. e calculation formula of Coulomb friction is as follows:…”

Section: Pile-soil Contact Modelmentioning

confidence: 99%

“…Compared with the traditional empirical formula, formula (22) uses the effective length conversion model to calculate the pile side friction resistance, and the calculated length of the pile side friction resistance is not the total pile length minus the height of nodular part. ere was no side friction force in the local area on the pile side in the upper part of the nodular part, while the friction resistance in the local area on the pile side in the lower part of the nodular part increased.…”

Section: Calculation Of Side Friction Force Of Nodular Pilesmentioning

confidence: 99%

Compressive Capacity of Vortex‐Compression Nodular Piles

Xue

et al. 2021

Advances in Civil Engineering

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Compared with traditional equal-section pile, the nodular parts of nodular pile expand the contact area between the pile and foundation soil, which can greatly improve the bearing capacity of pile foundation and increase the stability of pile body structure. In this paper, the mechanism of pile-soil interaction in the construction of vortex-compression nodular pile is studied with the purpose of evaluating the compressive capacity of nodular piles. Through the indoor model test and ABAQUS numerical simulation analysis, the compressive characteristics of 12 types of vortex-compression nodular pile are obtained, and the variation rules of the parameters of the compressive characteristics of vortex-compression nodular piles are quantitatively analyzed, including the failure pattern of foundation soil, load-settlement relationship, and load transfer law of vortex-compression nodular piles. The results showed that the compressive capacity of vortex-compression nodular piles has significant advantages over that of traditional equal-section piles. Based on the results of the indoor model test and numerical simulation, the calculation method and formula of the compressive capacity of vortex-compression nodular piles are given by modifying the corresponding calculation formula of traditional nodular piles. The new method and formula are more in line with the actual working conditions and provide theoretical and data support for the further engineering application of vortex-compression nodular piles.

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“…During 1960's, the researchers started working on interfaces with finite element method. The performance of the structure is highly influenced by interface between soil and structure [1][2]. Hence modeling the interface considering realistic physical condition is an important task [3].…”

Section: Introductionmentioning

confidence: 99%

Influence due to interface in finite element modeling of soil-structure interaction system: a study considering modified interface element

Dhadse¹,

Ramtekkar²,

Bhatt³

2021

Res. Eng. Struct. Mater.

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The finite element (FE) modeling of interface in Soil-Structure Interaction (SSI) problem is most important aspect from early days of modeling i.e. during 1960. The overall performance of the structure is completely influenced due to behavior of interface. Such as realistic interface modeling of SSI system subjected to lateral loads leads to appropriate evaluation of lateral sway and base shear stress. During recent times, many modifications have been done in interface modeling such as incorporation of slip and bonding effects. Also the interface joining variable degrees of freedom system (interface for solid to skeletal contact) has come into existence. Still the de-bonding behavior, interface nonlinearity as well as modification in solid to skeletal contact has been unexplored in literatures. Hence there is necessity to develop a FE-SSI model and to study the influence of interface in SSI system considering unexplored features. In this paper, an attempt has been made to show the influence due to interface (including de-bonding and non-linearity) in FE modeling of SSI system using modified 5 noded zero thickness interface element. The performance of modified interface element is a novel contribution in present paper. The present study is limited to static loading conditions only. The effect of interface has been studied by determining bending moment, lateral sway, base shear stress and footing settlement in structure. The inclusion of modified interface has improved the performance of structure by reducing the base shear stress and allowing the sway. Also the true redistribution of bending moment has been observed after considering the modified interface.

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A Contact Model Coupling Friction and Adhesion: Application to Pile/Soil Interface

Cited by 6 publications

References 29 publications

Effect of Grain Size and Distribution on Mechanical Behavior of Dune Sand

Effect of Grain Size and Distribution on Mechanical Behavior of Dune Sand

Compressive Capacity of Vortex‐Compression Nodular Piles

Influence due to interface in finite element modeling of soil-structure interaction system: a study considering modified interface element

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