A generalised failure envelope for undrained capacity of circular shallow foundations under general loading

Vulpe, Cristina; Gourvenec, Susan; Power, Maurice S.

doi:10.1680/geolett.14.00010

Cited by 110 publications

(44 citation statements)

References 30 publications

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“…strip, circular and rectangular) have been derived using plasticity analysis and finite element analyses [68,[70][71][72][73]. In these studies unlimited tensile strength was assumed for the interface (i.e.…”

Section: Gravity Basesmentioning

confidence: 99%

“…Taiebat and Carter [72] found that the position of the maximum moment in H-M plane shifts towards the moment axis with increasing vertical loading. In practical engineering, foundations could be shallowly embedded in non-uniform soils and the corresponding failure envelopes were presented by Bransby and Randolph [76] for strip foundations and Vulpe et al [73] for circular foundations, to account for the embedment ratio and soil strength heterogeneity. The thin surficial crust which arises in many deep-water locations could affect the failure envelope much.…”

Section: Gravity Basesmentioning

confidence: 99%

See 1 more Smart Citation

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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Section: Gravity Basesmentioning

confidence: 99%

Section: Gravity Basesmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…Fig. 6(a) shows the normalised failure envelopes in the HM load plane at V/V max = 0·5 computed by HVMCap (this study) and the envelopes from former studies (Gourvenec, 2008;Vulpe et al, 2014;Ntritsos et al, 2015). The strip and square representations in the referred studies had an aspect ratio of h/B = 0·5, where B is the width of the foundation.…”

Section: Verification Of Feamentioning

confidence: 99%

“…The properties of failure envelopes for skirted foundations have been investigated extensively in a number of experimental and numerical studies. The studies have considered how the shape and size of the failure envelopes are affected by the embedment depth, foundation geometry, shear strength profile, undrained and drained conditions, deformable and non-deformable soil plug and limited interface shear and tension strength (Jostad et al, 1994;Martin, 1994;Ukritchon et al, 1998;Taiebat & Carter, 2000;Villalobos, 2006;Gourvenec, 2008;Bransby & Yun, 2009;Randolph & Gourvenec, 2011;Vulpe et al, 2014;Gerolymos et al, 2015;Ntritsos et al, 2015;Vulpe, 2015). The present numerical study considers the undrained response of circular skirted foundations in clay subjected to combined static and cyclic general loading.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

2018

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Skirted foundations have been widely applied as offshore foundations for several decades. In design, the use of failure envelopes is convenient for assessing stability under combined loading. A large number of studies on failure envelopes exist in the literature based on experiments and numerical analyses. Most of these studies focus on ultimate capacity and static loading. This paper presents a numerical study focusing on cyclic degradation and failure envelopes for skirted foundations subjected to combined cyclic and static loading. It was found that the shapes of the failure envelopes are little affected by degradation expressed by the number of equivalent cycles. In addition to failure envelopes, contours of displacements were computed in the three-dimensional load space (vertical, horizontal and moment load) for a more complete description of the response. As an example, the well-defined cyclic contour diagrams of Drammen clay were utilised to demonstrate how foundation response diagrams can be established. The database is accompanied by a simplified procedure to account for cyclic degradation through equivalent number of cycles, different normalised load-displacement response and variation in foundation geometry. The framework of procedures can be used to estimate foundation stiffness and capacity and the results can serve as a basis for the development of foundation macro-element models.

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“…Only few studies were performed by considering the 33 caisson foundation using three-dimensional model. Most of these analyses did not 34 comprehensively covered a wide range of practical embedment ratios or investigate all 35 vertical, horizontal and moment bearing capacities [21][22]. A summary of previous 36 studies on undrained bearing capacities and failure envelopes of shallow foundations are 37 presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of undrained failure envelopes of caisson foundations under combined loading

Mehravar

Harireche

Faramarzi

2016

Applied Ocean Research

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In this paper, results of a three-dimensional finite element study addressing the effect of and maximum horizontal bearing capacity factors. The undrained response of caisson 8 foundations under combined V-H and V-M load space is studied and presented using 9 failure envelopes generated with side-swipe method. The kinematic mechanism 10 accompanying failure under uniaxial loading is addressed and presented for different 11 embedment ratios. Predictions of the uniaxial bearing capacities are compared with other 12 models and it is confirmed that the proposed equations appropriately describe the 13 capacity of caisson foundations under uniaxial vertical, horizontal and moment loading in 14 homogenous undrained soils. The results of this paper can be used as a basis for standard 15 design codes of off-shore skirted shallow foundations which will be the first of its kind. 16

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A generalised failure envelope for undrained capacity of circular shallow foundations under general loading

Cited by 110 publications

References 30 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

Evaluation of undrained failure envelopes of caisson foundations under combined loading

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