A Simple One-Scale Constitutive Model for Static Liquefaction of Sand-Silt Mixtures

Liu, Yang; Chang, Ching-Shung; Wu, She–Ching

doi:10.1590/1679-78251901

Cited by 6 publications

(3 citation statements)

References 60 publications

(48 reference statements)

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“…However, in recent years, more and more researchers also realized the severity of the failure caused by static liquefaction. One important aspect of liquefaction study is to predict the stress-strain relationship of granular materials that are susceptible to liquefaction [17].…”

Section: Static Liquefactionmentioning

confidence: 99%

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Leao

2018

CivileJournal

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This paper presents a case study of a static load induced liquefaction in a simple roadway widening project constructed in north eastern part of Ohio in 2008. The widening required an embankment fill, which moved nearly 4 feet vertically and 1 foot laterally after two days of installation. The main objective of the work is to demonstrate how a simple Constitutive model, in this case Nor Sand model, can represent the static liquefaction in loose sand layers under specific conditions. A set of parameters is assumed based on the soil properties and an Excel Spreadsheet is used for simulations of triaxial compression of sand. It was considered that the situation which led to the failure, and the situation after the solution adopted. Moreover, slope stability analysis is provided for validation of the original results using a commercial software. It was found that the model can represent through stress strain curves and stress paths the behavior of the soil layer which led to the embankment fill movement. As the original work considered only slope stability analysis to explain this phenomenon, the present study shows a different approach for the case study, and this is the main contribution of this research.

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Section: Static Liquefactionmentioning

confidence: 99%

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Leao

2018

CivileJournal

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“…Later several concepts such as "steady state line", "flow structure" were proposed to describe the liquefied deformation mechanism by several researchers (Poulos, 1982;Poulos et al, 1985;Prevost,1985;Lade and Pradel, 1990;Bazier and Dobry,1995). More recently, other researchers have carried out experimental research of the instability of sand under undrained conditions (Laouafa and Darve, 2002;Daouadji et al, 2009;Daouadji et al, 2011) and developed corresponding constitutive models to explain and predict this type of instability (Mr óz and Boukpeti, 2003;Desai et al, 2005;Rahman et al, 2014;Najma and Latifi, 2017;Chandrakant and Desai, 2016;Liu et al, 2016). These studies provide an important theoretical basis for the analysis of diffuse instability.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of diffuse instability in sandy soil using discrete element method under proportional strain path loading

Meng

Liu

Han

et al. 2018

Lat. Am. j. solids struct.

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The Loose sandy soil can manifest static liquefaction phenomenon under undrained condition, in which the onset of instability is within the failure line, and there is no obvious shear band. This type of failure mode, very different from localized instability that occurs in dense sand, is called the diffuse instability. In this paper, a series of proportional strain tests and fully drained tests under different initial void ratio were simulated using the discrete element method. The influence of strain increment ratio and the initial void ratio affecting the instability of sandy soil were discussed in detail. The development mechanism of pore water pressure in proportional strain tests was analyzed by comparing with the volumetric curve of fully drained test. Finally, a unified mechanism of diffuse instability of sandy soil in proportional strain tests was explained. Numerical results indicate that the strain increment ratio and the initial void ratio work together affecting the instability of specimen. The occurrence of diffuse instability is the result of effective stress reduction due to the development of pore water pressure, which depends on the difference of volumetric strain between fully drained tests and proportional strain tests. The increment of pore water pressure is determined by the difference of strain increment ratio, which can be used as an index to reflect the liquefaction potential of sandy soil.

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“…In addition, a few studies have been conducted to consider the effect of induced anisotropy by using constitutive models (Hareb and Doanh, 2012;Tang Tron Tran et al, 2014;Ye et al, 2012). Although various models have been presented to predict sandy soil behaviour in different loading conditions (Zang and Wang, 2012;Yang et al, 2008;Dafalias and Manzari, 2004;Lashkari, 2009;Liu et al, 2016;Wang and Xie, 2014;Li, 2002;, such models either have been used in restrictive anisotropic conditions and limited loading conditions or they have used a high number of material constants. Most models are not able to determine the parameters dependent on direction, such as fabric, by using stress and strain invariants.…”

Section: Introductionmentioning

confidence: 99%

Modification of a Constitutive Model in the Framework of a Multilaminate Method for Post-Liquefaction Sand

Dashti

Sadrnejad

Ganjian

2017

Lat. Am. j. solids struct.

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The estimation of the value and direction of post-liquefaction deformations is one of the most challenging issues in the modelling of liquefaction soil, due to the inherent and induced anisotropy. It is very important in the science of soil-constitutive models to present a simple and comprehensive model for the prediction of fabric anisotropy effects in pre-and post-liquefaction behaviour in granular soil. In the framework of the multilaminate method, 17 planes with predetermined directions are defined, instead of defining all occurrences depending on the direction in three planes perpendicular to each other in a Cartesian coordinate system. As a result, calculation accuracy is increased in the point due to the effectiveness of the behaviours in different directions. In the present study, after modifying an advanced model by removing constants related to the fabric effect and using lower constants, the precision of model performance after the removal of constants was studied and compared with experimental results in different monotonic, cyclic, drained, and undrained loading conditions. After this, the formation of stress and strain in 17 planes was evaluated in terms of pre-and post-liquefaction, with monotonic and cyclic loadings. The study of the curves shows induced anisotropy in different directions of sandy soil and thus proves the capability of the model in this regard.

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A Simple One-Scale Constitutive Model for Static Liquefaction of Sand-Silt Mixtures

Cited by 6 publications

References 60 publications

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Application of Nor Sand Constitutive Model in a Highway Fill Embankment Slope Stability Failure Study

Numerical investigation of diffuse instability in sandy soil using discrete element method under proportional strain path loading

Modification of a Constitutive Model in the Framework of a Multilaminate Method for Post-Liquefaction Sand

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