Influences of initial anisotropy and principal stress rotation on the undrained monotonic behavior of a loose silica sand

Fakharian, Kazem; Kaviani-Hamedani, Farzad; Imam, Reza

doi:10.1139/cgj-2020-0791

Cited by 14 publications

(3 citation statements)

References 66 publications

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“…Casagrande and Carillo [15] rst pointed out the importance of anisotropy in soil mechanics, and from the formation reasons of soil anisotropy, anisotropy can be divided into inherent anisotropy and stressinduced anisotropy. In recent years, researchers have gradually realized the importance of anisotropy in many aspects of geotechnical engineering, and a large number of research work has been carried out in the laboratory on the anisotropy of saturated soil [7,17,21, 46,47,54], which has increased the understanding of the mechanism of anisotropic soil mechanics characteristics. Currently, there are two common research methods: one is to collect undisturbed soil samples and study the inherent anisotropy of clay by using direct shear test [31,32,42], conventional triaxial test [23,27,55], hollow cylinder…”

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confidence: 99%

WITHDRAWN: Effect of matric suction on stress-induced anisotropy behavior of unsaturated clay

Su,

Cai,

et al. 2024

Preprint

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Lots of geotechnical engineering problems are closely related to the anisotropic behavior of unsaturated soils. In this paper, suction-controlled, consolidated, drained triaxial shear tests were conducted on clay under unsaturated conditions. For unsaturated clay, the effects of matrix suction (suctions of 30 kPa, 100 kPa, and 200 kPa), initial stress ratio (R1 = 0.5 and 1) and subsequent stress ratio (R2 = 1, 2 and 3) on the hydro-mechanical behavior were studied, and the evolution of water retention, stress-induced anisotropy characteristics and critical state parameters under different stress paths were obtained. The stress path exerted a substantial influence on the water retention capacity of the clay, and the initial stress ratio was found to be the determining factor for the air entry value of the clay. Under identical initial stress ratio conditions, the water retention capacity of the clay was observed to diminish commensurately with an increase in the subsequent stress ratio. As suction increases and subsequent stress ratios escalate, the specimen transitions from a state of shear shrinkage to dilatancy, the peak shear strength (qf) and initial stress ratio change from negatively to positively correlated, while the critical state volumetric strain (\(\varepsilon _{{\text{v}}}^{{\text{c}}}\)) and initial stress ratio are positively to negatively correlated, and the anisotropy of unsaturated clay undergoes a transformation from negative correlation to positive correlation with the subsequent stress ratio. The critical state saturation (\(S_{r}^{{\text{c}}}\)) exhibits a negative correlation with the initial stress ratio and subsequent stress ratio. Under the same stress path and different matrix suctions, there exists a unique critical state line in the p'-q plane passing through the origin, with its slope is critical state effective stress ratio (M'). The initial stress ratio determines the range of variation for the M' value, which is positively correlated with the subsequent stress ratio.

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confidence: 99%

WITHDRAWN: Effect of matric suction on stress-induced anisotropy behavior of unsaturated clay

Su,

Cai,

et al. 2024

Preprint

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“…Many experiments show a considerable dependence of the soil stiffness and strength on the loading direction under identical stress states [21][22][23]. Specifically, in the case of triaxial compression, horizontally deposited soil often exhibits a greater yield strength when the major principal stress is vertical (σ z > σ x = σ y , where the z-axis is along the vertical direction, while the xand y-axes are horizontal in the physical space) than when the major principal stress is horizontal (σ z = σ x < σ y ).…”

Section: Basic Ideamentioning

confidence: 99%

A Multiscale Method to Develop Three-Dimensional Anisotropic Constitutive Model for Soils

Tian,

Chen,

Yao

et al. 2024

Buildings

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A multiscale method is presented to develop a constitutive model for anisotropic soils in a three-dimensional (3D) stress state. A fabric tensor and its evolution, which quantify the particle arrangement at the microscale, are adopted to describe the effects of the inherent and induced anisotropy on the mechanical behaviors at the macroscale. Using two steps of stress mapping, the deformation and failure of anisotropic soil under the 3D stress state are equivalent to those of isotropic soil under the triaxial compression stress state. A series of discrete element method (DEM) simulations are conducted to preliminarily verify this equivalence. Based on the above method, the obtained anisotropic yield surface is continuous and smooth. Then, a fabric evolution law is established according to the DEM simulation results. Compared with the rotational hardening law, the fabric evolution law can also make the yield surface rotate during the loading process, and it can grasp the microscopic mechanism of soil deformation. As an example, an anisotropic modified Cam-clay model is developed, and its performance validates the ability of the proposed method to account for the effect of soil anisotropy.

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“…Several other applications of the CSSM framework are available in the literature. For instance, studies on effects of frictional angle, particle breakage, and deformation on the CS properties of soils (De Bono, 2018;Kang, 2019;Nie, 2022;Taiba, 2023;Wang, 2020;Yang, 2018;Yu 2017); effects of fabric anisotropy vs isotropy (Kazem, 2022;Kolapalli et al 2023;Papadimitriou, 2019;Rahman & Dafalias 2022); the role of principal stress rotation on the critical state line Kazem, 2022); the influence of polymer on the critical state of sand (Liu, 2020), and the impact of plastic and non-plastic fines on the critical state of sand (e.g., Mahmoudi et al 2018;Papadopoulou & Tika 2008Rahman & Dafalias 2022;Talamkhani & Naeini 2018). In the domain of numerical modeling of soils, the CSSM has also proved to be accurate in predicting a wide range of soil engineering characteristics.…”

Section: Introductionmentioning

confidence: 99%

The critical state characterization of east coast sand (ECS) and calibration for use with an advanced critical state soil constitutive model

Bolarinwa

Kalatehjari

Safuan

2022

Preprint

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This paper outlines the findings of a laboratory-based study to investigate the properties and undrained flow failure behavior of East Coast Sand (ECS). ECS is a commonly encountered coastal deposit from the upper North Island of New Zealand. This work aims to derive soil parameters for an advanced constitutive soil model (NORSAND) to enable predictive analyses of flow failure potential using the critical state framework. The emphasis in the study is placed on the undrained strength behavior under static, triaxial compressive loading conditions at confining pressures in the range of typical engineering interest and for a range of soil densities considered in loosely deposited sands common to nearshore marine and estuarine environments. The research objective of establishing the basic soil properties and intrinsic advanced geomechanical properties of ECS from Auckland was achieved through laboratory experiments and matching simulations for five different aspects of its undrained behavior under static loads. It was shown that loosely deposited ECS within mean effective stresses ranging between 50kPa and 200kPa can be susceptible to expensive flow failures of structures built on or with them. Therefore, the re-engineering of ECS by adequate soil improvement is required when used in earthworks.

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Influences of initial anisotropy and principal stress rotation on the undrained monotonic behavior of a loose silica sand

Cited by 14 publications

References 66 publications

WITHDRAWN: Effect of matric suction on stress-induced anisotropy behavior of unsaturated clay

WITHDRAWN: Effect of matric suction on stress-induced anisotropy behavior of unsaturated clay

A Multiscale Method to Develop Three-Dimensional Anisotropic Constitutive Model for Soils

The critical state characterization of east coast sand (ECS) and calibration for use with an advanced critical state soil constitutive model

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