Bearing capacity of two interfering strip footings from lower bound finite elements limit analysis

Kumar, Jyant; Bhattacharya, Paramita

doi:10.1002/nag.1104

Cited by 24 publications

(2 citation statements)

References 20 publications

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“…The failure surface comprises of both scoop and shear mechanism as shown in Fig. (10). However, a complex solution is needed to describe such case (Gourvenec & Steinepreis, 2007) Fig.…”

Section: Closely Spaced Shallow Foundation In Offshore Structuresmentioning

confidence: 99%

Interaction of Closely Spaced Shallow Foundations on Sands and Clays: A review

Alwalan¹

2018

IJAERS

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The evaluation of the static interaction of closely spaced footings and its influence in the overall bearing capacity and settlement on sand and clay soils is addressed in this review. The work is accomplished through a comprehensive look into all relevant literature regarding the interaction of sallow foundations, assessments are made, and conclusions are drawn which will ultimately be relevant to future endeavors associated with the design and the evaluation of closely spaced shallow foundations in terms of determining the optimal spacing between footings, enhancing bearing capacity, and controlling deformation. Furthermore, the work is divided to three major approaches: theoretical studies, experimental or field tests, and numerical analysis. Each have been discussed thoroughly in details, with indicating the shortcomings of previous studies and where each approach has reached. The result of this review has showed that nearly all previous research studies explored the effect of the interaction of closely spaced shallow foundations on the bearing capacity at the ultimate failure compared to the settlement behavior which is for some reason not addressed profoundly, even though it is more critical than bearing capacity. Additionally, current regulations and codes have not devoted a major effort toward addressing the influence of closely spaced shallow foundations appropriately, especially today, where the limitation of a site and the placing of footings close together in order to accommodate structural details are becoming a more common issue.

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“…The failure surface comprises of both scoop and shear mechanism as shown in Fig. (10). However, a complex solution is needed to describe such case (Gourvenec & Steinepreis, 2007) Fig.…”

Section: Closely Spaced Shallow Foundation In Offshore Structuresmentioning

confidence: 99%

Interaction of Closely Spaced Shallow Foundations on Sands and Clays: A review

Alwalan¹

2018

IJAERS

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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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Zur Tragfähigkeit einzelner und benachbarter Streifenfundamente – Berechnungen zum Einfluss der Sohlreibung und von Wechselwirkungsfaktoren mittels der KEM

Blumenthal

Gumbsch²,

Lavasan

et al. 2014

Geotechnik

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Die Beurteilung der Grundbruchsicherheit flach gegründeter Fundamente ist ein zentrales Thema auf dem Gebiet der Bodenmechanik und des Grundbaus. In Deutschland ist die Nachweisführung in [1] für ausgewählte Randbedingungen geregelt. Die Grundbruchgleichung basiert auf dem Superpositionsansatz nach Terzaghi. In diesem Beitrag wird der signifikante Einfluss der Sohlreibung auf den Bruchmechanismus und die Tragfähigkeit eines einzelnen Streifenfundaments diskutiert. Für eine raue Sohlausbildung wird der bekannte Berechnungsansatz für den Grundbruchwiderstand für den Fall zweier benachbarter und wechselwirkender Streifenfundamente erweitert. Mit Hilfe der Kinematischen Elemente Methode (KEM) nach [2] und [3] werden zunächst ein geeigneter Bruchmechanismus entwickelt und anschließend für unterschiedliche Abstände S zwischen den beiden Fundamenten und verschiedene Reibungswinkel ϕ die Traglasten der Fundamente berechnet. Durch Einführung eines Wechselwirkungsfaktors η, der die Traglast benachbarter Fundamente mit der eines frei stehenden Fundaments in Relation setzt, wird die Steigerung der Traglast beschrieben. Ein Vergleich mit anderen theoretischen sowie experimentellen Untersuchungen zeigt eine gute Übereinstimmung mit den mit der KEM berechneten Ergebnissen bei vergleichbaren Annahmen der Bruchmechanismen sowie der Sohlreibungsverhältnisse.On the bearing capacity of single and interfering strip footings – Analysis of the influence of footing‐base‐friction and interference factors by the KEM. The assessment of bearing capacity of shallow footings is one of the main topics in soil mechanics as well as in foundation engineering. In Germany the safety analysis is regulated in [1]. Chosen boundary conditions are considered. The so called ground failure equation is based on the superposition principle after Terzaghi. In the present article the significant influence of base‐friction on the bearing capacity of shallow strip footings will be discussed. The general approach of the bearing capacity analysis will be extended to the boundary condition of two adjacent interfering rough footings. By using the Kinematical Element Method (KEM), originally developed in [2] and [3], an appropriate failure mechanism will be developed and bearing capacity calculations are carried out for varying distances S between the footings. Also different friction angles ϕ of the soil will be considered in this parameter study. By defining an efficiency factor η, as the ratio of an interfering footing and one that is isolated, the change in bearing capacity can be evaluated. A comparison with available theoretical and experimental data confirms the present KEM‐results.

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Bearing capacity of two interfering strip footings from lower bound finite elements limit analysis

Cited by 24 publications

References 20 publications

Interaction of Closely Spaced Shallow Foundations on Sands and Clays: A review

Interaction of Closely Spaced Shallow Foundations on Sands and Clays: A review

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

Zur Tragfähigkeit einzelner und benachbarter Streifenfundamente – Berechnungen zum Einfluss der Sohlreibung und von Wechselwirkungsfaktoren mittels der KEM

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