Bearing capacity of rigid shallow footing on geogrid-reinforced fine sand—experimental modeling

El-Soud, Sameh Abu; Belal, Adel M.

doi:10.1007/s12517-018-3597-0

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…Fig 14 presents for the large scale the increase of the coefficient of maximum improvement by increasing the armament length until the appropriate length ratio is equivalent to 7 times the footing base width. After this value, the coefficient of enhancement gradually decreases to a constant value that is obtained for the reinforcement length equal to 9 times the footing width [9][10][11][12][13][14][15][16][17][18][19][20]. This result is similar to the small scale model [48].…”

Section: Effect Of the Length Of Reinforcementsupporting

confidence: 58%

“…The subject of scale effect has been extremely crucial to the comprehension of the unreinforced and reinforced soil behavior that turned up beneath the shallow foundations [1][2][3][4][5][6][7][8][9][10][11][12]. DeBeer [1] was concluded that bearing capacity is not increased linearly based on the width of a footing.…”

Section: Introductionmentioning

confidence: 99%

“…The footing width needs to be chosen at least 5 times of the geogrids aperture [8]. Sameh Abu El-Soud et al [9] have been studying the enhancement of the resolution characteristics and bearing capacity of a rigid shallow foundation on fine dune sands utilizing geogrid reinforcement to show acceptable performance. The testing plan includes 24 trials on the loading plate on a steel bar with a different widths (B): 75, 100 and 120 mm, which is posted on the reference unarmed sand to find the ratio of endurance (BCR) to be held.…”

Section: Introductionmentioning

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 the Length Of Reinforcementsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…Improvement of the bearing capacity of sand in the range of 1.17 to 3.9 was achieved by reinforcing shredded waste tires in [25]. Plate load tests on a strip footing with width 75, 100, and 120 mm rested on unreinforced fine sand and reinforced with geo-grid was conducted to evaluate improvement of the bearing capacity and settlement characteristics in [26]. This study concluded that the gain Prakash Bhaskarrao Kulkarni, et al…”

Section: Literature Reviewmentioning

confidence: 91%

Development of Single-Phase Microbial Cementation Method and to Investigate its Efficacy on Bearing Capacity, UCS, and Permeability of Sandy Soils

Kulkarni

Nemade²,

Chavan

et al. 2021

J. Eng. Technol. Sci.

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Microbially induced calcite precipitation (MICP) is a method based on collaborative knowledge of microbiology, chemistry and geotechnical engineering. The objective of this study was to investigate the increase of the bearing capacity and the unconfined compressive strength (UCS) as well as the reduction of the permeability of sandy soil using MICP. Experiments were carried out using Bacillus Pasteurii, on three different types of sand. The admixture of bacterial culture and cementation (BCC) solution all-in-one with sand by single-phase injection was applied to induce cementation. Three samples of the selected sand were treated with varied concentrations of BCC solution, ranging from 0.05 to 0.2 L/kg, with a curing period of 3, 7 and 14 days. The test results indicated an enhancement of 55% in UCS for sand treated with a BCC content of 0.05 to 0.2 L/Kg and a reduction of 40% in permeability for untreated sand with an effective diameter of 0.5 mm treated with 0.2 L/kg of BCC solution after 14 days of curing. The results of a plate load test (PLT) on MICP treated sand showed an increase in the ultimate bearing capacity (qu) by about 2.95 to 5.8 times and a 1.7 to 3.31-fold reduction in settlement corresponding to the same load applied on untreated footing. Further investigation of the size and shape of the bearing plate on bearing capacity and settlement was carried out through a plate load test. The higher and more favorable results shown by a rectangular plate compared to a circular plate indicate that the first is preferable.

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“…A laboratory model test of a surface strip footing on reinforced sand beds was presented in [29] to investigate the effects of reinforcement length with various types and numbers of reinforcements. An experimental study was conducted in [30] to assess the influence of the geogrid extension and embedment depth below strip footing rested on fine loose sand. In [31], a regression model was developed to determine the bearing capacity of a circular foundation supported on sand reinforced with geogrid.…”

Section: Introductionmentioning

confidence: 99%

Behavior of a Circular Footing resting on Sand Reinforced with Geogrid and Grid Anchors

Helis

Mansouri

Abbèche

2023

Eng. Technol. Appl. Sci. Res.

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This study used finite element analysis to investigate the influence of using two reinforcing systems, the geogrid and the grid anchor, on the bearing capacity of a circular footing resting on sand. The parameters studied were the effect of the number of reinforcement layers (N), the depth ratio of the topmost layer of reinforcement (u/d), the vertical spacing ratio between consecutive layers (h/d), and the effect of reinforcement length (L). The results showed that the reinforcement layout had a very significant effect on the behavior of the reinforced sand foundation. The maximum bearing capacity for single-layer inclusion was obtained when reinforcement was placed at a depth of u/d=0.42. Bearing capacity was also found to improve when increasing the number of reinforcement layers from 1 to 3. Additionally, the analysis showed that the sand reinforced by grid anchors performed better than that reinforced by geogrid. Finally, an improvement in load capacity was obtained by increasing the length of the inclusions, and the optimal length of the reinforcements was determined at 5d for both inclusions.

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Bearing capacity of rigid shallow footing on geogrid-reinforced fine sand—experimental modeling

Cited by 11 publications

References 21 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

Development of Single-Phase Microbial Cementation Method and to Investigate its Efficacy on Bearing Capacity, UCS, and Permeability of Sandy Soils

Behavior of a Circular Footing resting on Sand Reinforced with Geogrid and Grid Anchors

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