Laterally Loaded Piles and the Pressuremeter: Comparison of Existing Methods

Briaud, J-L; Smith, Trevor D.; Meyer, Barry J.

doi:10.1520/stp36815s

Cited by 49 publications

(8 citation statements)

References 9 publications

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“…In the p-y method the pile is assumed to behave as an Euler-Bernoulli beam with the soil modelled as a series of discretely spaced springs, each connected to one of the pile segments into which the pile is discretised. The springs model the soil response to loading through p-y curves ( p is the unit resistance per unit pile length offered by the springs, and y is the pile deflection), which are developed empirically by adjusting the curves until they match actual load-displacement results Briaud et al, 1984;Yan & Byrne, 1992;Brown et al, 1994;Gabr et al, 1994;Briaud, 1997;Wu et al, 1998;Bransby, 1999;Ashour & Norris, 2000). However, the p-y method often fails to predict pile response (Anderson et al, 2003;Kim et al, 2004), for it is not capable of capturing the complex three-dimensional interaction between the pile and the soil.…”

Section: Introductionmentioning

confidence: 99%

A continuum-based model for analysis of laterally loaded piles in layered soils

2009

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An analysis is developed to calculate the response of laterally loaded piles in multilayered elastic media. The displacement fields in the analysis are taken to be the products of independent functions that vary in the vertical, radial and circumferential directions. The governing differential equations for the pile deflections in different soil layers are obtained using the principle of minimum potential energy. Solutions for pile deflection are obtained analytically, whereas those for soil displacements are obtained using the one-dimensional finite difference method. The input parameters needed for the analysis are the pile geometry, the soil profile, and the elastic constants of the soil and pile. The method produces results with accuracy comparable with that of a three-dimensional finite element analysis but requires much less computation time. The analysis can be extended to account for soil non-linearity.

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Section: Introductionmentioning

confidence: 99%

A continuum-based model for analysis of laterally loaded piles in layered soils

2009

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“…5 The RSD material consists of slide material that has been eroded and reworKed by the Columbia River, resulting in a heterogeneous mixture of materials from si It to large boulders; much of the unit consists of hard angular rocK fragments, with about 5-percent boulder-size to smal I slide blocK material. Recent age River Deposits locally over!…”

Section: Local Geologic Settingmentioning

confidence: 99%

A finite difference soil-structure interaction study of a section of the Bonneville Navigation Lock buttress diaphragm wall utilizing pressuremeter test results

McCormack¹

2000

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LocK Buttress Diaphragm Wal 1 Uti I izing Pressuremeter Test Results. APPROVED BY MEMBERS OF THE THESIS COMMITTEE:M.M. Chairman . rvif'lH~esonThe P-y curve, used in current practice as an efficient I ine-load vs. soi I displacement model for input into the finite difference method of laterally loaded pi le ana I ys is, is extended in this study for use with The results indicate that preloading wi 11 reduce wall deflections by at least 4-fold, but that wal I cracKing can potential Jy double deflections. Safety factors against passive soi I fai Jure were determined to be about 5 at anchor pre load, and more than 40 after ful I excavation.

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“…(7) die vertikale Ausgangsspannung der Teilschichten im Erddruckkeil verwendet (Bild 3). Die mobilisierten Reibungswinkel (ϕ mob ) i der Teilschichten im Erddruckkeil berechnen sich (Bild 2) für rollige Böden aus der folgenden Beziehung: (10) Damit ergeben sich nach Bild 2 die mobilisierten Keilwinkel (β mob ) i zu (14) Dabei werden die Faktoren S 1 und S 2 in Abhängigkeit von der Pfahlquerschnittsform nach Briaud et al [7] eingesetzt. Für einen kreisförmigen Querschnitt beträgt der Faktor S 1 = 0,75 bzw.…”

Section: Introductionunclassified

Ein Bemessungsmodell für Monopilegründungen unter zyklischen Horizontallasten

Ta&&numan¹,

Rackwitz²,

Glasenapp³

2011

Bautechnik

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Monopiles werden als Gründungen für die Offshore‐Windenergieanlagen (OWEA) in Nord‐ und Ostsee geplant und eingesetzt. Die Monopilegründungen werden neben den statischen Lasten insbesondere durch die hochzyklischen Horizontalbelastungen aus Wind und Wellengang beansprucht. Aufgrund der zyklischen Belastungen findet eine Akkumulation der Bodenverformungen und gleichzeitig auch der bleibenden Pfahlverschiebungen statt, die derzeit mit einem praxistauglichen Verfahren zuverlässig nicht quantifiziert werden können. Im vorliegenden Aufsatz wird ein anwendungsorientiertes Bemessungsmodell vorgestellt, welches unter Verwendung von statischen und zyklischen Triaxialversuchen eine Prognose der Verschiebungen von Monopiles unter zyklischen Horizontallasten mit variierenden Belastungsamplituden ermöglicht. Die Verifikation des vorgestellten Modells erfolgt durch eine Reihe von Monopileversuchen, die in der Geotechnischen Versuchsgrube der TU Berlin durchgeführten wurden. Die Anwendbarkeit des Modells zur Ermittlung der über die Nutzungsdauer einer OWEA zu erwartenden Verschiebungen der Monopilegründung wird anhand einer Beispielrechnung gezeigt.A design model for monopile foundations under cyclic horizontal loads. Monopiles are used and planned for foundations of offshore wind power turbines in the Northern and Baltic Sea. Besides the static loads, these piles are also subjected to high numbers of cyclic horizontal loads due to wind and water waves. The accumulation of soil deformations and pile displacements due to cyclic loads can not be reliably calculated based on current design methods. The paper presents a practical design approach for the prediction of monopile displacements due to irregular cyclic horizontal loads which can be suitably calibrated by means of static and cyclic triaxial test results. The design approach has been validated with results from monopile load tests. The practical application of the proposed method demonstrates its usefulness for the prediction of monopile displacements over the service lifetime of an offshore wind power turbine.

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Laterally Loaded Piles and the Pressuremeter: Comparison of Existing Methods

Cited by 49 publications

References 9 publications

A continuum-based model for analysis of laterally loaded piles in layered soils

A continuum-based model for analysis of laterally loaded piles in layered soils

A finite difference soil-structure interaction study of a section of the Bonneville Navigation Lock buttress diaphragm wall utilizing pressuremeter test results

Ein Bemessungsmodell für Monopilegründungen unter zyklischen Horizontallasten

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