Scale Effects of Shallow Foundation Bearing Capacity on Granular Material

Cerato, Amy B.; Lutenegger, Alan J.

doi:10.1061/(asce)1090-0241(2007)133:10(1192)

Cited by 172 publications

(83 citation statements)

References 25 publications

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“…In some applications, however, anchors are embedded in coarse granular soils such as gravels, cobbles, ballast and fragmented rocks, leading to smaller ratios B/d. Interestingly, with small ratios of B/d, studies of bearing capacities of foundation footing have detected some noticeable grain-size effects (Tatsuoka et al, 1997;Cerato & Lutenegger, 2007). Similarly, some results suggest that uplift capacities of plate anchors would increase with the grain size for relatively small B/d Hsu & Chang, 2007;Costantino et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Grain-size effect on uplift capacity of plate anchors in coarse granular soils

Athani

Kharel

Airey

et al. 2017

Géotechnique Letters

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This letter investigates the uplift capacity of plate anchors in granular soils. Simulations based on a discrete-element method are used to measure the uplift capacity of anchors of differing widths to embedment B/H and width to grain-size B/d ratios. Results confirm that the uplift capacity of anchors with a large B/d ratio is well described by existing models developed from continuum mechanics, with no grain-size effect. In contrast, results reveal a strong deviation from these models for anchors with relatively small B/d ratios. A semi-empirical model is introduced that captures this strong grain-size effect. This model is further supported by a micro-mechanical analysis, indicating that anchor uplift capacities are not only governed by a frustum mechanism predicted by continuum mechanics but also involve the mobilisation of grains surrounding this frustum. These results and model are particularly important to rationalise uplift capacities measured in small-scale experiments, typically involving small B/d ratios, and to safely upscale them to larger anchor size relevant to field applications.

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Section: Introductionmentioning

confidence: 99%

Grain-size effect on uplift capacity of plate anchors in coarse granular soils

Athani

Kharel

Airey

et al. 2017

Géotechnique Letters

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“…In so doing the path toward the critical state line of the soil in small-scale would resemble that in large-scale and dilation would be suppressed (Cerato and Lutenegger, 2007, LeBlanc et al, 2010, Wood, 2004. However, here the aim is not to scale up the ultimate capacity and the stiffness of the monotonic behaviour.…”

Section: Scope and Aims Of The Modellingmentioning

confidence: 98%

Monopod Bucket Foundations Under Cyclic Lateral Loading

Foglia¹,

Ibsen²

2016

IJOPE

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Technical Reports are published for timely dissemination of research results and scientific work carried out at the Department of Civil Engineering (DCE) at Aalborg University. This medium allows publication of more detailed explanations and results than typically allowed in scientific journals.Technical Memoranda are produced to enable the preliminary dissemination of scientific work by the personnel of the DCE where such release is deemed to be appropriate. Documents of this kind may be incomplete or temporary versions of papers-or part of continuing work. This should be kept in mind when references are given to publications of this kind.Contract Reports are produced to report scientific work carried out under contract. Publications of this kind contain confidential matter and are reserved for the sponsors and the DCE. Therefore, Contract Reports are generally not available for public circulation.Lecture Notes contain material produced by the lecturers at the DCE for educational purposes. This may be scientific notes, lecture books, example problems or manuals for laboratory work, or computer programs developed at the DCE.Theses are monograms or collections of papers published to report the scientific work carried out at the DCE to obtain a degree as either PhD or Doctor of Technology. The thesis is publicly available after the defence of the degree.Latest News is published to enable rapid communication of information about scientific work carried out at the DCE. This includes the status of research projects, developments in the laboratories, information about collaborative work and recent research results. Monopod bucket foundations under cyclic lateral loading AbstractThe monopod bucket foundation can be a cost-reducing sub-structure for offshore wind turbines. To avoid problems during the turbine operation, the long-term effect of cyclic loading must be considered in the design of the foundation. In this paper a 1g testing rig is adopted to extend the knowledge on bucket foundations under lateral cyclic loading. The test setup is described in detail and a comprehensive experimental campaign is presented. The foundation is subjected to cyclic overturning moment, cyclic horizontal loading and constant vertical loading, acting on the same plane for thousands of cycles. Three buckets with different embedment ratios are tested. The data interpretation is focused on the long-term permanent rotation of the foundation and, particularly, on understanding how the controlling variables influence the potential for rotation accumulation. New and more general parameters of an empirical model predicting the long-term plastic rotation are proposed on the base of the experimental results. List of notation

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“…The bearing capacity of a foundation is influenced by its width, the cover depth, and the type of foundation (strip foundation or column footing) [1,4,12,21]. For this end, shape and depth factors have been determined that account for these circumstances.…”

Section: Deriving the Shape And Depth Factorsmentioning

confidence: 99%

Calculation of Presumed Bearing Capacity of Shallow Foundations According to the Principles of Eurocode 7

Móczár

Szendefy

2017

Period. Polytech. Civil Eng.

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15004-1989 [16] allowed for the use of a so-called "permissible bearing pressure" for preliminary dimensioning, and for foundation design in case of buildings with low importance. With this method, the central, vertical limit load of strip foundations and column footings with a given geometry could be obtained by applying the permissible bearing pressure along with shape and depth factors. In the light of the popularity of this method, and given that EC7 allows for employing design methods based on prescriptive measures, the authors have developed a new calculation method which conforms to the principles of EC7 and which is similar to the former method.

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Scale Effects of Shallow Foundation Bearing Capacity on Granular Material

Cited by 172 publications

References 25 publications

Grain-size effect on uplift capacity of plate anchors in coarse granular soils

Grain-size effect on uplift capacity of plate anchors in coarse granular soils

Monopod Bucket Foundations Under Cyclic Lateral Loading

Calculation of Presumed Bearing Capacity of Shallow Foundations According to the Principles of Eurocode 7

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