Uplift of Anchor Plates in Sand

Murray, Edward J.; Geddes, James

doi:10.1061/(asce)0733-9410(1987)113:3(202)

Cited by 299 publications

(173 citation statements)

References 12 publications

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“…The breakout factor of strip anchor in a Mohr-Coulomb soil is usually modelled by equation (1) using a function f s ≈ tan ϕ(H/B) (Meyerhof & Adams, 1968;Murray & Geddes, 1987). This leads to the following breakout formula:…”

Section: Modelling Grain-size Effect On Uplift Capacity Of Strip Anchorsmentioning

confidence: 99%

“…In frictional soils like dense sands, their vertical uplift capacity F 0 is well predicted by models based on continuum mechanics (Meyerhof & Adams, 1968;Rowe & Davis, 1982;Murray & Geddes, 1987), which can be expressed in the following generic form…”

Section: Introductionmentioning

confidence: 99%

“…1). Several expressions of the function f were established to capture the measured uplift capacity of anchors of different shapes, including strip, square, rectangular, circular and fractal geometries (Meyerhof & Adams, 1968;Murray & Geddes, 1987;Dyson & Rognon, 2014), embedded in soils of differing internal friction angle ϕ. Most of these studies, however, consider large ratios of anchor-to-soil grain size, B/d, reflecting applications where large anchors are placed in fine sandy soils.…”

Section: Introductionmentioning

confidence: 99%

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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: Modelling Grain-size Effect On Uplift Capacity Of Strip Anchorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Because of the small capacities and the temporary nature of their functions, engineers rarely put efforts into collecting engineering properties of soils for the design of small ground anchors. These constraints lead to design uncertainty even though various methods are available for determining the pullout capacity of ground anchors (Meyerhof and Adams, 1968;Vesic, 1971;Meyerhof, 1973;Das and Seeley, 1975;Das, 1978;1980;1987;Rowe and Davis, 1982a;1982b;Vermeer and Sutjiadi, 1985;Murray and Geddes, 1987;Dickin, 1988;Sutherland, 1988;Koutsabeloulis and Griffiths, 1989;Rao and Kumar, 1994;Basudhar and Singh, 1994). Shahin and Jaksa (2003) initiated a different approach and paved the way for a rational design of small anchors at a nominal cost.…”

Section: Introductionmentioning

confidence: 99%

Pullout capacity of small ground anchor: a least square support vector machine approach

Samui

Kim

Aiyer

2015

J. Zhejiang Univ. Sci. A

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This study employs the least square support vector machine (LSSVM) for the prediction of pullout capacity of small ground anchor. LSSVM is firmly based on the theory of statistical learning and uses regression technique. In LSSVM, Vapnik and Lerner (1963)'s ε-insensitive loss function was replaced by a cost function which corresponded to a form of ridge regression. The input parameters of LSSVM were equivalent anchor diameter, anchor embedment depth, average cone tip resistance, average cone sleeve friction, and installation technique. Using 83 out the available 119 in-situ test datasets, an LSSVM regression model was developed. The goodness of the model was tested using the remaining 36 data points. The developed LSSVM also gave an error bar of predicted data. A sensitivity analysis was conducted to determine the effect of each input parameter. The results were compared with the artificial neural network (ANN) model. Overall, LSSVM was shown to perform well.

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“…Modelo de superficie de rotura vertical (Majer, 1955). Modelo de cono truncado invertido (Downs y Cbieurzzi, 1966;Murray y Geddes, 1987), en el que la superficie de rotura forma un ángulo con la vertical igual al ángulo de rozamiento interno del terreno o la mitad de éste (Clemence y Veesaert, 1977). Modelo de superficie curva, para cimentaciones con base circular (Baila, 1961) Y con base rectangular o cuadrada (Meyerhof y Adams, 1968), La superficie de rotura para pilotes sin base acampanada se aproxima a una línea recta que comienza en la base de la cimentación extendiéndose hasta la superficie según el modelo de Majer, (Ismael y Klym, 1979;Kulhawy et al, /7 (u ,~'77 , .…”

Section: Introductionunclassified