Effect of reinforcement length for different geosynthetic reinforcements on strip footing on sand soil

Çiçek, Elif; Güler, Erol; Yetimoğlu, Temel

doi:10.1016/j.sandf.2015.06.001

Cited by 71 publications

(25 citation statements)

References 24 publications

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“…The optimum spacing ratio for 2-layer geogrid is 0.40B (B, the width of footing). This critical ratio leads to hold the greatest effect of the geogrid reinforcement in this character of ground improvement [45]. These consequences are similar with the previous researches in the literature review.…”

Section: Effect Of Reinforcement Spacingsupporting

confidence: 89%

“…Therefore, it is possible to say that in order to obtain high-resistance in the reinforced soil system, it is preferable to use an equal length of geogrid 7 times of the strip footing width that gives the greatest effect of the geogrid reinforcement [48]. The same results that obtained from [45,46,48]. Fig 15 illustrates that the higher the footing width, the greater the value of the BCR.…”

Section: Effect Of the Length Of Reinforcementmentioning

confidence: 65%

“…At first the BCR rises by increasing the spacing ratio (h/B) and then it reduces followed by a threshold value of h/B. This threshold spacing ratio (h/B) is nearly 0.40 [45][46][47]. The optimum spacing ratio for 2-layer geogrid is 0.40B (B, the width of footing).…”

Section: Effect Of Reinforcement Spacingmentioning

confidence: 99%

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Scale effect study on the modulus of subgrade reaction of geogrid-reinforced soil

2020

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Both experimental and numerical investigations conducted on strip footing laying down over the geogrid reinforced fine sand bed. Firstly, an evaluation of the significance of geogrid reinforcement to enhance the soil's strength is required to carry out a series of a small-scale model of reinforced and unreinforced soil beneath static loading. Next, the series of the large-scale numerical analyses were implemented to define the soil bed reaction modulus and bearing capacity ratio of reinforced sand soil in plane strain conditions. The Mohr-Coulomb soil constitutive model was used to represent the fine sandy soil and the linear elastic tension model was utilized for modeled geogrid reinforcement elements. One of the most beneficial outcomes in the unreinforced soil case, the ultimate bearing capacity progress occurs by developing the width of the strip footing. Then in reinforcing case, an uppermost geogrid layer's depth under the footing and the fittest spacing between the reinforcing layers are not affected by the wide ranges of the footing widths. Their optimum values are similar to the works of literature (u/B = 0.3 and h/B = 0.4), but they are affected by soil friction angles. Finally, the achievement of this study indicates that the coefficient of soil reaction is associated with a nonlinear behavior with the relative ratio of tensile stiffness of the geogrid to the elasticity modulus of soil and enhanced by increased the number of geogrid layers. The influence of geogrid length on subgrade modulus is negligible and only the effective depth is affected it. The value of reaction modulus decreases when both the footing width and settlement increase. A simple new method is proposed to determine an approximate value of subgrade reaction modulus in reinforced soils.

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Section: Effect Of Reinforcement Spacingsupporting

confidence: 89%

Section: Effect Of the Length Of Reinforcementmentioning

confidence: 65%

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Scale effect study on the modulus of subgrade reaction of geogrid-reinforced soil

2020

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“…Kuranchie et al [20] studied load-settlement behavior of strip footing laid on iron ore tailings. Cicek et al [21] studied reinforcing soil and the effect of reinforcement length on the strip footing behavior by geogrids. Reinforcement length as well as the types and number of reinforcements were tested to determine whether they affect the optimum reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle roundness and morphology on the shear failure mechanism of granular soil under strip footing

Ghalehjough¹,

Akbulut²,

Çelik³

2018

ActaGeotechSlov

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This study investigates the effect of particles roundness and morphology on the shear failure mechanism of soil. A strip footing was modeled under laboratory conditions. Calcareous soil was tested with three roundness classes: angular, rounded and well-rounded shapes with sizes of 0.30 mm to 4.75 mm. These were divided into six different groups at three relative densities of 30%, 50% and 70%. A series of photographs was taken during the tests and analyzed using the particle image velocimetry (PIV) method to understand the soil-deformation mechanism. The results showed that increasing the sample sizes increased the affected area of the soil. At the same time, increasing the relative density caused a punching failure mechanism that went towards the general failure. The shear failure mechanism of the soil changed from general toward punching shear failure with increasing particle roundness. This effect was larger with the smaller materials. Underneath the affected layers of soil, the angular samples were deeper than the rounded and well-rounded samples. The affected depth in the angular soil was approximately 1.5B in the smallest size group. This was more than 3B and near 4B in the largest size group. Both the sides and the underlying soil layers should be considered on angular soils. The area under the footing becomes more important than the side parts after increasing the roundness of the particles.

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“…Therefore, this research focuses on using geosynthetics to reinforce the ground to reduce ground deformation and to increase the bearing capacity of the ground. In recent years, many researchers have specified the base reinforcement technique as a solution to increase the bearing capacity of soft ground using the tensile strength of the reinforcement (Omar et al (1993), Khing et al (1993), Yetimoglu et al (1994), Patra et al (2005), Latha and Somwanshi (2009), Lovisa et al (2010), Boushehrian et al (2011), Alamshahi and Hataf (2009), Cicek et al (2015)). The reinforcement used as geosynthetics consists of fiber materials that can withstand tensile forces acting upon the soils from the upper surcharge.…”

Section: Introductionmentioning

confidence: 99%

Effective use of geosynthetics to increase bearing capacity of shallow foundations

et al. 2017

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In this research, a reinforcement mechanism for shallow foundations is determined through laboratory model tests and numerical analyses. The numerical analyses are performed with the finite element program FEMtij-2D using the elastoplastic subloading tij model. The frictional behavior between the reinforcement and the ground is simulated using an elastoplastic joint element. Several tests were performed whereby the installation depth, length, roughness, and fixity conditions at the edges of the reinforcement were varied. Results show that the effectiveness of the reinforcement and the bearing capacity of the reinforced ground depend on the position, length, roughness, and fixity condition of the reinforcement. A significant increase in the bearing capacity can be achieved if the geosynthetics are properly placed at an optimum length with the boundary fixed to the ground. The effect of the loading position is also investigated because in reality the load on a foundation does not always act at the center of the foundation. The numerical results accurately describe the experimental results; the simulations accurately account for the mechanical behaviors of both the soil and reinforcement and the frictional behavior between them. Therefore, the simulation technique can be used to predict the bearing capacity of reinforced ground.

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Effect of reinforcement length for different geosynthetic reinforcements on strip footing on sand soil

Cited by 71 publications

References 24 publications

Scale effect study on the modulus of subgrade reaction of geogrid-reinforced soil

Scale effect study on the modulus of subgrade reaction of geogrid-reinforced soil

Effect of particle roundness and morphology on the shear failure mechanism of granular soil under strip footing

Effective use of geosynthetics to increase bearing capacity of shallow foundations

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