Behavior of closely spaced square and circular footings on reinforced sand

Lavasan, Arash Alimardani; Ghazavi, Mahmoud

doi:10.1016/j.sandf.2012.01.006

Cited by 91 publications

(30 citation statements)

References 17 publications

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“…These studies are generally meant for reinforced strip foundations. In the recent past, a few experimental and analytical studies have also been undertaken to examine the behavior of circular footings placed on reinforced soil media (Boushehrian and Hataf, 2003;Basudhar et al, 2007;Sireesh et al, 2009;Lovisa et al, 2010;Chakraborty and Kumar, 2012;Lavasan and Ghazavi, 2012;Ornek et al, 2012;Demir et al, 2013). Boushehrian and Hataf (2003) have performed a series of laboratory tests, along with a numerical analysis, to examine the effect of the depth of the first layer of the reinforcement, vertical spacing and number of reinforcement layers on the bearing capacity of foundations.…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of circular foundations reinforced with geogrid sheets

Chakraborty

Kumar

2014

Soils and Foundations

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The ultimate bearing capacity of a circular footing, placed over a soil mass which is reinforced with horizontal layers of circular reinforcement sheets, has been determined by using the upper bound theorem of the limit analysis in conjunction with finite elements and linear optimization. For performing the analysis, three different soil media have been separately considered, namely, (i) fully granular, (ii) cohesive frictional, and (iii) fully cohesive with an additional provision to account for an increase of cohesion with depth. The reinforcement sheets are assumed to be structurally strong to resist axial tension but without having any resistance to bending; such an approximation usually holds good for geogrid sheets. The shear failure between the reinforcement sheet and adjoining soil mass has been considered. The increase in the magnitudes of the bearing capacity factors (N c and N γ ) with an inclusion of the reinforcement has been computed in terms of the efficiency factors η c and η γ . The results have been obtained (i) for different values of ϕ in case of fully granular (c ¼ 0) and c Àϕ soils, and (ii) for different rates (m) at which the cohesion increases with depth for a purely cohesive soil (ϕ ¼ 0 ○ ). The critical positions and corresponding optimum diameter of the reinforcement sheets, for achieving the maximum bearing capacity, have also been established. The increase in the bearing capacity with an employment of the reinforcement increases continuously with an increase in ϕ. The improvement in the bearing capacity becomes quite extensive for two layers of the reinforcements as compared to the single layer of the reinforcement. The results obtained from the study are found to compare well with the available theoretical and experimental data reported in literature.

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Section: Introductionmentioning

confidence: 99%

Bearing capacity of circular foundations reinforced with geogrid sheets

Chakraborty

Kumar

2014

Soils and Foundations

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“…Most of the studies are on strip or circular footings in spite of the fact that the rectangular and square footings are far more common in practice. The resting of square footings on the reinforced soils are studied by very few researchers like Akinmusuru and Akinbolade [2], Omar et al [22], Adams and Collin [1], Ghazavi and Lavasan [14], Latha and Somwanshi [19], Kumar and Kaur [18], Lavasan and Ghazavi [20], Farsakh et al [12] and Ronad [27]. Very few of the earlier researchers studied the difference in the effect of reinforcement for different footing shapes.…”

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confidence: 99%

Improvement of bearing capacity of soil by using natural geotextile

Panigrahi

Pradhan

2019

Geo-Engineering

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Generally the placement of the foundation of the structure on the loose soil strata causes the structural damage. These loose soil strata have no capacity to sustain the structural load of the structures. As a result settlement and cracks are developed on the structures and structure will undergo collapse. So people choose the deep foundation to construct their structure in these loose soil strata. But sometimes the costs for the construction of structures are more due to the adoption of deep foundation. Hence, to avoid the above problems, the ground improvements are adopted. The use of geo synthetics is most common method for the improvement of ground. These geo synthetics are used as reinforcing agent to reinforce the soil strata, as a result the density and strength (bearing capacity) of the soil strata increased. The term reinforced soil refers to a soil that has been strengthened by placement of reinforcing material within the soil mass in the form of strips, bars, sheets or grid (meshes). When load is applied to the reinforced soil mass, these materials resist tensile stresses which develop within the reinforced soil mass. When the tensile strength of an

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“…The tests were conducted on sands with relative densities of 35% and 65%. Compaction technique was used in the test tank to achieve these densities, according to methodology used by Lavasan and Ghazavi [21]. In sand compaction, a 12 kg hammer falls 6 and 15 times from a 600 mm height on a steel square plate measuring 500 × 500 × 5 mm to reach relative densities of 35% and 65%, respectively.…”

Section: Preparation Methods Of Specimens and Tests Stepsmentioning

confidence: 99%

“…In their study, the effects of boundaries and adjacent footings on each other were not considered due to the proximity of boundaries and footings [1]. Some studies showed that the adjacent footings placed on reinforced soil have a different load-settlement characteristic compared with single footings [14,21,22]. For the first time, in this study, using large loading plates, a more accurate estimation of the behavior of the full-scale footings supported on geocell-reinforced sand can be presented.…”

Section: Introductionmentioning

confidence: 96%

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

2018

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The scale effect on bearing capacity of shallow footings supported by unreinforced granular soils has been evaluated extensively. However, the subject has not been addressed for shallow footings on geocell-reinforced granular soils. In this study, load-settlement characteristic of large square footings is investigated by performing large-scale loading tests on unreinforced and geocell-reinforced granular soils. The effects of footing width (B), soil relative density of soil (Dr), and reinforcement depth (u) have been investigated. The test results show that the scale effects exist in geocell-reinforced soils, like unreinforced soils, and the behavior of small-scale models of footings cannot be directly related to the behavior of full-scale footings due to the difference between initial conditions of tests and the initial state of mean stresses in the soil beneath the footings having different dimensions. Large footings create higher mean stresses in the soil, resulting in low soil friction angle and initial conditions of the test approach to the critical state lines. The results of tests indicate that model experiments should be conducted on low-density soil for better prediction of the behavior of full-scale footings, otherwise, the predicted behavior of full-scale footings does not seem conservative.

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Behavior of closely spaced square and circular footings on reinforced sand

Cited by 91 publications

References 17 publications

Bearing capacity of circular foundations reinforced with geogrid sheets

Bearing capacity of circular foundations reinforced with geogrid sheets

Improvement of bearing capacity of soil by using natural geotextile

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

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