Interaction of adjacent strip footings on reinforced soil using upper-bound limit analysis

Biswas, Nripojyoti; Ghosh, Priyanka

doi:10.1680/jgein.18.00020

Cited by 22 publications

(14 citation statements)

References 43 publications

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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: 81%

“…Many researchers have studied the problem by performing small-scale laboratory or field tests, as well as by conducting theoretical or numerical analyses on an unreinforced soil medium. These studies have implemented different theoretical or numerical techniques, such as a method of stress characteristics (Graham et al, 1984;Kumar and Ghosh, 2007a); upper bound limit analysis (Kumar and Kouzer, 2008;Kumar, 2008, 2010;Kumar and Ghosh, 2007b;Yang et al, 2017;Biswas and Ghosh, 2018;Keawsawasvong et al, 2021;Yodsomjai et al, 2021); lower bound limit analysis Bhattacharya, 2010, 2013;Shiau et al, 2021;Keawsawasvong and Boonchai Ukritchon, 2022); the finite difference method (Ghazavi and Lavasan, 2008;Ghosh and Sharma, 2010;Mabrouki et al, 2010;Lavasan and Ghazavi, 2012b;Javid et al, 2015;Lavasan et al, 2017); the finite element method (Lee et al, 2008;Lee and Eun, 2009;Kumar and Bhoi, 2010;Nainegali et al, 2013Nainegali et al, , 2018Nainegali et al, , 2019Noorzad and Manavirad, 2014;Zidan and Mohamed, 2019;Sekhar et al, 2020;Shokoohi et al, 2019;Fuentes et al, 2019;Ekbote and Nainegali., 2019a, b;Sekhar et al, 2020;Alzabeebee, 2020Alzabeebee, , 2022Ekbote et al, 2022); the analytical method Saran, 2003b, 2004;Ghos...…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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

Ekbote,

Nainegali

2023

Ing. Inv.

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“…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%

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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“…In the past three decades, geosynthetics have been extensively implemented all around the world for improving weak foundations, reinforcing critical slopes and retaining walls, coastal protection systems, and improving weak pavement layers, among many other applications ( 12, 17–20 ). Both woven and non-woven geotextiles have been widely used for reinforcement and hydraulic applications in pavement design ( 17 ).…”

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confidence: 99%

Evaluating the Performance of Wicking Geotextile in Providing Drainage for Flexible Pavements Built over Expansive Soils

Biswas

Puppala

Khan

et al. 2021

Transportation Research Record: Journal of the Transportation R

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The longevity and performance of a pavement section depend on the characteristics of the subgrade soil. A majority of the pavements in North Texas, U.S., are constructed on expansive soils. The deterioration of the pavement performance because of rutting, cracking, and differential heaving is a regular phenomenon in the regions predominantly distributed with expansive soils. The pavements, particularly those built for low-volume traffic conditions, experience distress because of the high swelling and shrinkage characteristics of the underlying problematic soils. Geosynthetics have been traditionally used to improve such poor subgrades because of their many benefits, such as ease of installation, and ample mechanical and hydraulic properties. In the last decade, a newly available wicking geotextile, with a moisture redistribution capacity, has been developed to improve the performance of pavements constructed over expansive and frozen soils. In this study, small-scale laboratory and full-scale field studies were conducted to comprehend the wicking ability of this innovative geotextile in an expansive soil environment. Full-scale test sections were constructed with reclaimed asphalt pavement aggregate and traditional crushed stone aggregates in the base layer near North Texas. Details of the construction and instrumentation procedure are discussed in this paper. A comparative study between the performance of the pavement sections subjected to traffic loads and moisture intrusion was also performed. Furthermore, the rutting life of the sections, estimated using a linear elastic model, was compared and validated using the in situ data. The observations during the initial phase indicated that the wicking geotextile has the potential to improve the long-term pavement performance.

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Interaction of adjacent strip footings on reinforced soil using upper-bound limit analysis

Cited by 22 publications

References 43 publications

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

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

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

Evaluating the Performance of Wicking Geotextile in Providing Drainage for Flexible Pavements Built over Expansive Soils

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