Experimental evaluation of mechanically stabilized earth walls with recycled crumb rubbers

Moghadam, Matin Jalali; Zad, Amirali; Mehrannia, Nima; Dastaran, Nader

doi:10.1016/j.jrmge.2018.04.012

Cited by 28 publications

(6 citation statements)

References 35 publications

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“…The face of permanent retaining walls was built using prefabricated or integrated concreted concrete panels. Like the study of Moghadam et al, (2018), the face of the retaining wall was manufactured using an aluminum sheet with a thickness of 0.9 mm (equivalent to a 30-cm concrete face) based on the recommendation by Wood (2017). A chamber with a length of 124 cm, a width of 53 cm, and a depth of 82 cm was manufactured to build the retaining walls.…”

Section: Experimental Testsmentioning

confidence: 99%

“…The diameter of the anchor rod is 4 mm, which was equivalent to 4 cm in diameter rebar. Using the results of Moghadam et al, (2018), the arrangement of anchors was selected as a diamond (Fig. 2).…”

Section: Experimental Testsmentioning

confidence: 99%

“…the rst time,Moghadam et al (2018) used plate anchors vertically in the retaining walls. In this research, the effect of adding recycled crumb rubber in the back ll of the mechanically stabilized earth wall with plate anchors with different characteristics was investigated.…”

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confidence: 99%

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Influence Of Tire-Shreds' Aspect Ratio On Performance Of Mechanically Stabilized Retaining Walls

Kazemzadeh

Moghadam

Zad

2022

Preprint

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Reusing scrap tires to save storage space or lower traditional disposal risks is among today's environmental challenges. Current, recycled tires are considered low-cost, lightweight materials to improve soils and retaining walls, backfills, and roadbeds. The present study investigated the effect of tire shred’s aspect ratio and weight percentage on the bearing capacity and displacement of the stabilized mechanical retaining wall with multi-plate anchors under static loading. To this end, sandy soils containing tire shreds with widths of 1 and 2 cm, aspect ratios of 1, 2, 3, 4, and 5, and weight percentages of 5, 10, 15, and 20% were examined. Also, direct shear tests were conducted for determining the shear strength parameters of the mixtures. The results demonstrated that adding more tire shreds increased bearing capacity. Also, it was found that by increasing the weight percentage of tire shreds in the mixture at a constant aspect ratio, the bearing capacity of the mixture increased. At a constant aspect ratio, the horizontal wall displacement incremented by increasing the weight percentage of the tire shreds. Furthermore, the wall's bearing capacity was enhanced at a constant weight percentage by increasing the aspect ratio of tire shreds. The results of Piv analysis show that by increasing tire shreds aspect ratio, the particle strains on the slip surface will be increased.

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Section: Experimental Testsmentioning

confidence: 99%

Section: Experimental Testsmentioning

confidence: 99%

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Influence Of Tire-Shreds' Aspect Ratio On Performance Of Mechanically Stabilized Retaining Walls

Kazemzadeh

Moghadam

Zad

2022

Preprint

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“…Through the transparent side walls, photographic images of the backfill at different stages of wall deformation can be captured for examination. Obtained images are analyzed using PIV method, which led to visualized passive failure surfaces [32][33][34][35][36]. The model retaining wall is an aluminium plate with rectangular cross-section.…”

Section: The Retaining Wall Modelmentioning

confidence: 99%

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Soltanbeigi

Altunbas

Gezgin

et al. 2020

Period. Polytech. Civil Eng.

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Correct determination of the passive failure surface geometry is necessary for the design of retaining structures. The conventional theories assume linear passive failure surfaces even though it is known that the actual failure surfaces are non-linear. Many researchers claimed the appropriateness of a hybrid curved-linear method. This approach estimates the curved section by a log-spiral function, which then connects to the backfill surface with the conventional linear assumption. The main drawback here is that the geometric properties of the hybrid mathematical function is not directly related to the mechanical properties of soils. Thus, this study attempts to provide a mechanical description for the assumed geometrical parameters. For this purpose, a series of 1 g small scale retaining wall model tests, simulating passive failure, are conducted on two different backfill soils. The relative density is varied in the model tests and the resultant peak friction angles of the backfills are calculated as functions of failure stress state and relative density using a well-known empirical equation. Transparent sidewalls allow for visualization of the failure surface evolution, which is obtained by capturing images and analysing then through Particle Image Velocimetry (PIV) technique. Subsequently, the quantified slip zones are fitted with the hybrid curved-linear approach. The relationships between the peak friction angle and the geometrical characteristics of the best-fit log-spiral and linear functions are investigated. Obtained results are used to propose a set of equations that allow the estimation of non-linear passive failure surfaces as function of peak friction angle.

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“…The inclusion of tire-derived materials into the soil has been the focus of several studies, such as reinforcement for road subsoil or as a component of fill material (Bosscher et al, 1997;Edinçliler & Cagatay, 2013), light fill material for containment structures (Reddy & Krishna, 2017;Moghadam et al, 2018), or as an asphalt additive (Xu et al, 2017), due not only to the potential for finding an adequate destination for waste tires, but also because of the characteristics that these materials provide to the soil. Experimental results reported in the literature show that there are improvements to physical properties and to the tensionstrain behavior of soils that have been reinforced with pneumatic waste material (Ozkul & Baykal, 2007;Tafreshi et al, 2012;Balunaini et al, 2014;Fu et al, 2014;Anvari et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical Behavior of Soil with Tire Fibers

Silva¹,

Fucale²,

Ferreira³

2020

S&R

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Products derived from tires have been increasingly used for geotechnical engineering applications because of the economic, environmental, and social benefits they provide. The objective of this paper is to analyze the effect of the addition of rubber fibers from unserviceable tires on the hydromechanical behavior of argillaceous soil from the Barreiras Formation, in the Brazilian northeast. Soil mixtures were prepared containing 10 % and 20 % tire fibers, by weight, at optimum moisture and maximum dry specific weight. Their microstructure, shear strength, and permeability were evaluated. The Scanning Electron Microscopy (SEM) analysis indicates changes in the soil microstructure from the addition of the fibers and there is an intense interaction of fiber with the soil matrix. There is an increase in the shear strength of the blends by up to 47 %, making them more ductile. The saturated hydraulic conductivity of the soil is in the order of 10-10 m/s, assuming values between 10 -8 and 10 -6 m/s when the tire fibers are inserted into the structure.

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Experimental evaluation of mechanically stabilized earth walls with recycled crumb rubbers

Cited by 28 publications

References 35 publications

Influence Of Tire-Shreds' Aspect Ratio On Performance Of Mechanically Stabilized Retaining Walls

Influence Of Tire-Shreds' Aspect Ratio On Performance Of Mechanically Stabilized Retaining Walls

Determination of Passive Failure Surface Geometry for Cohesionless Backfills

Hydromechanical Behavior of Soil with Tire Fibers

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