Calibration of a Comprehensive Hypoplastic Model for Granular Materials

Bauer, Erich

doi:10.3208/sandf.36.13

Cited by 423 publications

(309 citation statements)

References 6 publications

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“…The particular hypoplastic model for sand used here has been proposed in [22,23] and includes the extensions of [24,25] to account for limit states and the mechanical behavior under cyclic loading. For completeness, the full mathematical expressions of the constitutive functions are attached in Appendix A.…”

Section: Constitutive Equationsmentioning

confidence: 99%

An ALE method for penetration into sand utilizing optimization-based mesh motion

Aubram

Rackwitz

Wriggers

et al. 2015

Computers and Geotechnics

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Section: Constitutive Equationsmentioning

confidence: 99%

An ALE method for penetration into sand utilizing optimization-based mesh motion

Aubram

Rackwitz

Wriggers

et al. 2015

Computers and Geotechnics

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“…While the initial hypoplastic model [10] required 8 parameters, those incorporating the intergranular concept and cyclic features [11] can go up to 13. That number contrasts with the more manageable 2 or 3 parameters necessary to understand what are believed to be the essentials of pile response used in the remainder of this invited lecture.…”

Section: More Advanced Modelsmentioning

confidence: 99%

Axial Non-linear Dynamic Soil-Pile Interaction - Keynote

Holeyman

Whenham²

2014

MATEC Web of Conferences

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Abstract. This keynote lecture describes recent analytical and numerical advances in the modeling of the axial nonlinear dynamic interaction between a single pile and its embedding soil. On one hand, analytical solutions are developed for assessing the nonlinear axial dynamic response of the shaft of a pile subjected to dynamic loads, and in particular to vibratory loads. Radial inhomogeneity arising from shear modulus degradation is evaluated over a range of parameters and compared with those obtained by other authors and by a numerical radial discrete model simulating the pile and soil movements from integration of the laws of motion. New approximate non linear solutions for axial pile shaft behaviour developed from general elastodynamic equations are presented and compared to existing linear solutions. The soil non linear behaviour and its ability to dissipate mechanical energy upon cyclic loading are shown to have a significant influence on the mechanical impedance provided by the surrounding soil against pile shaft movement. The limitations of over-simplified modelling of pile response are highlighted.

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“…The basic hypoplastic theory (Kolymbas 1988, Bauer 1996, von Wolffersdorf 1996, Herle 1997) is expanded by Niemunis and Herle (1997) to model realistically the accumulation effects and the hysteretic material behaviour under cyclic loading. An additional state variable, which is the intergranular strain, is introduced to consider the influence of changing direction of deformation on the mechanical behaviour of soil.…”

Section: Hypoplastic Constitutive Lawmentioning

confidence: 99%

Serbest Ve Ri̇ji̇t Başli Açik Deni̇z Teki̇l Kazik Temelleri̇ni̇n Tekrarli Yatay Yükler Etki̇si̇ Altindaki̇ Davranişi

Taşan¹

2017

Uludağ University Journal of the Faculty of Engineering

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Offshore piles are subjected to cyclic lateral loads due to environmental loads, such as wind and waves. These loads can lead to an accumulation of permanent soil deformations and excess pore water pressures in saturated soils. Finite element analyses are performed to investigate the behaviour of cyclic laterally loaded free-head and fixed piles embedded in sandy saturated soil while considering such accumulation effects. A three-dimensional fully coupled two-phase finite element is developed and implemented on the basis of a two-phase model to consider the pore water pressure development in saturated soil. In addition, a hypoplastic constitutive model is used to describe the material behaviour of sandy soil under cyclic loading. In the numerical analyses, special attention is dedicated to interactions between the pile, the saturated soil and the pore water. The results have shown that the pile displacements caused by cyclic lateral loads are significantly underestimated for both pile head conditions by approaches which do not take into account the impact of the pore water pressure development in saturated sandy soil of the pile response.Keywords: Offshore piles, cyclic lateral loading, finite element method, fixed-head pile, free-head pile, sandy soil, accumulation, permanent displacement, pore water pressure, two-phase model Serbest ve Rijit Başlı Açık Deniz Tekil Kazık Temellerinin Tekrarlı Yatay Yükler Etkisi Altındaki DavranışıÖz: Açık deniz tekil kazık temelleri rüzgar ve dalga kaynaklı ağır tekrarlı yatay yüklere maruz kalmaktadır. Bu yükler nedeniyle kalıcı zemin deplasmanları ve suya doygun zeminde aşırı boşluk suyu basıncı birikimi gerçekleşebilmektedir. Çalışmada serbest ve rijit başlı tekil kazık temellerinin tekrarlı yatay yükler altındaki davranışı sonlu elemanlar yöntemi ile zeminde aşırı boşluk suyu basıncı gelişimi ve deplasman birikimi dikkate alınarak incelenmiştir. Üç boyutlu sonlu elemanlar analizlerinde, zeminde aşırı boşluk suyu basıncı gelişiminin belirlenmesi amacıyla iki fazlı modele dayanan üç boyutlu elemanlar geliştirilmiştir. Böylelikle kazığın çevresindeki zeminde boşluk suyu basıncı gelişiminin elde edilmesi mümkün olmuştur. Kumlu zemin, tekrarlı yükler altındaki davranışının modellenmesine uygun olan bir hipoplastik malzeme modeli ile tanımlanmıştır. Nümerik analizlerde özellikle kazık, suya doygun zemin ve boşluk suyu basıncı etkileşimi üzerine odaklanmıştır. Analiz sonuçları, tekrarlı yatay yük etkisindeki serbest ve rijit başlı kazıkların deplasmanlarının tahmininde, suya doygun zeminde aşırı boşluk suyu basıncı gelişimini dikkate almayan mevcut modellerin yetersiz kaldığı göstermiştir.Anahtar Kelimeler: Tekil kazık, açık deniz, tekrarlı yatay yükleme, sonlu elemanlar yöntemi, serbest başlı tekil kazık, rijit başlı tekil kazık, kumlu zemin, kalıcı deformasyon, aşırı boşluk suyu basıncı

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Calibration of a Comprehensive Hypoplastic Model for Granular Materials

Cited by 423 publications

References 6 publications

An ALE method for penetration into sand utilizing optimization-based mesh motion

An ALE method for penetration into sand utilizing optimization-based mesh motion

Axial Non-linear Dynamic Soil-Pile Interaction - Keynote

Serbest Ve Ri̇ji̇t Başli Açik Deni̇z Teki̇l Kazik Temelleri̇ni̇n Tekrarli Yatay Yükler Etki̇si̇ Altindaki̇ Davranişi

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