Interference of two closely spaced footings embedded in unreinforced and reinforced soil medium: a finite element approach using ABAQUS

Ekbote, Anupkumar G.; Nainegali, Lohitkumar

doi:10.1007/s12517-019-4868-0

Cited by 10 publications

(5 citation statements)

References 44 publications

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“…Similarly, the p-δ behaviour of left and right footings when D L /B = 1.0 for D R /B = 0.5, 0.75 and 1.0 is presented in Figures 6, 7, and 8, respectively. The p-δ behaviours illustrated in Figure 3 and Figure 8 are those of the symmetrical footings and are found to be in line with the results reported by Ekbote and Nainegali [15]. Moreover, the p-δ behaviours presented in Figure 4…”

Section: Resultssupporting

confidence: 89%

“…The tangential component is defined using the Coulomb's friction law by virtue of which tangential behaviour between the contact surfaces is defined using a coefficient of friction, µ, which is equal to the tangent of soil friction angle, (µ = tan ). The extreme boundaries are prescribed with appropriate conditions following Nainegali et al [11,12] and Ekbote and Nainegali [15,17]. The roller supports are considered along with the far end vertical boundaries to restrict the horizontal displacement (u 1 = 0) and to allow any possible vertical displacement (u 2 ) then, the horizontal boundary is considered to be fixed to restrict both horizontal and vertical displacements (u 1 = u 2 = 0).…”

Section: Mechanical Properties Of Soil Parameters Valuesmentioning

confidence: 99%

“…Several reports are published after the pioneering work reported by Stuart [1] using different analytical/numerical methods and experimental observations. The studies offering the understanding of two or multiple interfering footings using analytical/numerical methods use upper and lower bound limit analysis [2][3][4][5][6][7], finite difference method [8][9][10], finite element method [11][12][13][14][15][16][17][18] and analytical method [19,20], the probabilistic method [21] and others [22]. Then several experimental studies [23][24][25][26][27][28][29] have been reported on the interference of surface footings.…”

Section: Introductionmentioning

confidence: 99%

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Behavioural Assessment on Influence of Adjacently Placed Strip Footings at Different Embedment Level

Ekbote¹,

Nainegali

Rajhans

et al. 2022

Architecture, Civil Engineering, Environment

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The footings laid in close proximity imposes a definite change in the behaviour of the adjacent footing, subsequently changing the behaviour of the nearby footings. The present study emphasises the behaviour of the nearby strip footings embedded at a different level by adopting the commercially available finite element analysis program, ABAQUS. The load-settlement behaviour, ultimate bearing capacity (UBC), and the failure patterns of adjacent strip footings are assessed by considering the Mohr-Coulomb failure criterion. The UBC is of the nearby footings (left and right) are estimated and represented in terms of interference factors (ξL/ξR ) defined as the UBC of a footing in the presence of adjacent footing to that of same considered for equivalent isolated footing. The results reveal that a significant influence of the adjacent footing is experienced when the spacing between the footings (S/B) is lesser, and they behave as the single footing of greater width at S/B = 0.25 irrespective of the level of embedment depth. Furthermore, the influence of interference increases with the increase in the embedment depth of adjacent footing. It is found that the ξL is significantly more for a lower level of embedment depth, and the same increases with an increase in the embedment depth of the right footing but on the contrary ξR decreases. The increase in the peak interference factor, ξL-max for DL/B = 0.5 is 2.1% and 4.2% when DR/B = 0.75 and DR/B = 1.0, respectively.

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Section: Resultssupporting

confidence: 89%

Section: Mechanical Properties Of Soil Parameters Valuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Behavioural Assessment on Influence of Adjacently Placed Strip Footings at Different Embedment Level

Ekbote¹,

Nainegali

Rajhans

et al. 2022

Architecture, Civil Engineering, Environment

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“…The bearing capacity of the left footing when N = 1 increases from 104 to 185%, with a decrease in the depth of footing embedment from D f /B L = 1,0 to 0,25. The improvement in the ultimate bearing capacity for symmetrical interfering footings in a soil medium reinforced with N-layers of geosynthetic material is evident in earlier research on surface footings (Ghazavi and Lavasan, 2008;Lavasan et al, 2017;Biswas and Ghosh, 2018) and embedded footings (Ekbote and Nainegali, 2019a), which holds true in the case of asymmetric footings. However, r ,max L ξ is higher than r ,max R ξ .…”

Section: Resultsmentioning

confidence: 80%

“…The reinforcement configuration is provided by optimizing the bearing capacity in order to obtain the maximum value. This is also done in Ekbote and Nainegali (2019a). Thus, the depth of the first layer of reinforcement u is 0,35 times B L from the bottom of the footing, the distance between the first and the second layer h is 0,4 times B L , and the length of reinforcement layer b is 5,0 times B L .…”

Section: Methodsmentioning

confidence: 99%

Study on Closely Spaced Asymmetric Footings Embedded in a Reinforced Soil Medium

Ekbote,

Nainegali

2023

Ing. Inv.

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In practice, footings are rarely laid on the surface or at ground level; usually, they are embedded in the soil medium. Most studies focus on surface footings. This research examines the behavior of two interfering asymmetric footings while considering their widths to be dissimilar and the effect of embedment depth to enhance the ultimate bearing capacity and limit the settlement within the working range. This was evaluated through the finite element method of the ABAQUS software. The soil was assumed to have a Mohr-Coulomb failure, and the asymmetry corresponded to the footing widths. The results are presented in terms of interference factors, i.e., the ultimate bearing capacity (UBC) and the settlement, which are defined as the UBC/settlement ratio of the left/right footing in the presence of the other one placed on reinforced soil. This, in comparison with an identical isolated footing on unreinforced soil. Interference is more significant in small footings than in large ones. Due to behavioral variations, the bearing capacity and settlement are different. This effect increases with an increase in the width of large footings, and the interference factors decrease with an increase in the embedment depth of the footings. When the right footing width is twice that of the other and considering one layer of reinforcement and soil friction angles of 30º and 40º, the percent increments in the bearing capacity of interfering left footings, for a spacing of 0,5 times the left footing width, are 104 and 148%, respectively.

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A novel simple technique for determining the geogrid geometry affecting the bearing capacity of reinforced cohesive-frictional soil

2021

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Interference of two closely spaced footings embedded in unreinforced and reinforced soil medium: a finite element approach using ABAQUS

Cited by 10 publications

References 44 publications

Behavioural Assessment on Influence of Adjacently Placed Strip Footings at Different Embedment Level

Behavioural Assessment on Influence of Adjacently Placed Strip Footings at Different Embedment Level

Study on Closely Spaced Asymmetric Footings Embedded in a Reinforced Soil Medium

A novel simple technique for determining the geogrid geometry affecting the bearing capacity of reinforced cohesive-frictional soil

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