Characterization and constitutive modeling of red clay contaminated with ammonium carbonate

Li, Shanmei; Riad, Beshoy; Zhang, Xiong; Liu, Zhikui

doi:10.1002/nag.3146

Cited by 9 publications

(3 citation statements)

References 53 publications

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“…where superscripts “ e ” and “ p ” refer to the elastic and plastic strains, respectively. Equation 19 can be used to derive a solution for K 0 corresponding to any critical state soil model ( 85, 86 ). Using the volumetric and shear strain equations in the BBM (similar to Equations 6, 8, 9, and 13 in this paper), Zhang et al ( 19 ) derived Equations 20 and 21 for K 0 in the elastic and plastic zones, respectively.…”

Section: Theoretical Analysis Of Test Resultsmentioning

confidence: 99%

Characterizing and Modeling the Coupled Hydro-Mechanical Cyclic Behavior of Unsaturated Soils Using Constant Water Content Oedometer and Direct Shear Tests

Riad

Zhang

2022

Transportation Research Record: Journal of the Transportation R

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Most transportation infrastructures are constructed on compacted soils that are typically unsaturated above the groundwater table. The soils are subjected to cyclic traffic loadings and seasonal wetting–drying cycles. Although problems associated with unsaturated soils are ubiquitous in the US, coupled hydro-mechanical analysis is rarely included in the design/analysis of transportation geosystems. This can be attributed to two main reasons: (a) there are no simple devices/methods which can be used to rapidly characterize stress–strain behavior for unsaturated soils, and (b) there is a lack of a constitutive model to study coupled hydro-mechanical cyclic behavior for unsaturated soils in a consistent way. This paper takes advantage of the recent advancements in suction measurement and constitutive modeling to overcome these limitations. In this paper, conventional oedometer and direct shear tests for saturated soils are modified to characterize stress–strain behavior of unsaturated soils under cyclic undrained loading conditions. Then, series of constant water content cyclic oedometer and direct shear tests are performed to characterize the hydro-mechanical behavior of a silty soil. Moreover, methods are developed to use results from both tests to calibrate parameters for a recently proposed hydro-mechanical constitutive model. The paper also compares the model predictions with the measured results. Results indicate that the model is able to satisfactorily predict the hydro-mechanical hysteresis behavior of the soil. With developments in equipment, constitutive models, and analysis, it is now possible to fully characterize the hydro-mechanical behavior of unsaturated soils in a more efficient manner.

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Section: Theoretical Analysis Of Test Resultsmentioning

confidence: 99%

Characterizing and Modeling the Coupled Hydro-Mechanical Cyclic Behavior of Unsaturated Soils Using Constant Water Content Oedometer and Direct Shear Tests

Riad

Zhang

2022

Transportation Research Record: Journal of the Transportation R

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“…However, the at-rest earth pressure and lateral stress can be calculated using the formulation provided by Zhang et al ( 50 ). It worth notice that the MSSA was also used to provide a rigorous elasto-plastic interpretation of K o loading conditions for both saturated and unsaturated soils ( 51 – 53 ). After the lateral stress is determined, the mean net stress ( p ) and deviatoric stress ( q ) can be calculated, and then the triaxial equations apply.…”

Section: Model Validation Under Triaxial Conditionmentioning

confidence: 99%

Consistent Three-Dimensional Elasto-Plastic Model to Study Unsaturated Soil Behavior with Considerations of Coupled Hydro-Mechanical Hysteresis

Riad

Zhang

2021

Transportation Research Record: Journal of the Transportation R

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This paper presents a consistent three-dimensional elasto-plastic model to study unsaturated soil behavior with consideration of coupled hydro-mechanical hysteresis. The model was first formulated under isotropic conditions with special consideration to the non-linearity of the hydraulic behavior. Only one yield curve is used to represent the yielding of both mechanical and hydraulic behaviors (i.e., the occurrence of plastic water content changes and mechanical strains). Later, the model is extended to general three-dimensional stress conditions. It was formulated in a way that a smooth transition between the saturated and unsaturated soil states is guaranteed. The model provides consistent predictions for different soil phases that is considered a significant limitation in many existing models. One of the characteristic features of the proposed model is the ability to represent the hydro-mechanical coupling during shearing. Moreover, the model is able to represent the degree of saturation increase or decrease during shearing that is closely related to the soil’s contractive or dilative behavior, respectively. The model is validated through the prediction of several hydro-mechanical behavioral features. The paper also compares the model predictions with published experimental results performed under different loading conditions. The response of the model is satisfactory in relation to both mechanical and hydraulic behaviors.

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“…For the mechanical properties of red clay in the Guilin region, Zeng et al [22] investigated the effect of water content on the shear strength of red clay and determined and classified the content and type of adsorbed bound water in red clay, which elucidated the microscopic mechanism by which bound water affects the strength properties of red clay. Li et al [23] studied the shear strength and compressibility of red clay in different concentrations of a (NH 4 ) 2 CO 3 solution. In summary, scientists at home and abroad have studied one-dimensional and three-dimensional creep tests of soil and established creep models.…”

Section: Introductionmentioning

confidence: 99%

Creep Properties and Creep Modelling of Guilin Red Clay

Wei,

Gu,

Liu

et al. 2023

Applied Sciences

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In order to explore the creep characteristics of red clay under different pressures, the stress–strain curve and stress–strain–time curve of red clay under different pressures were obtained, and the triaxial shear and creep characteristics of red clay under different pressures were analysed. A triaxial shear test and creep test were carried out on red clay from Guilin as the research object under different pressures. The results show that: ➀ the cohesion and the angle of internal friction of red clay from Guilin, obtained from a triaxial shear test, are 57.20 kPa and 22.47°, respectively; ➁ according to the physical meaning of the parameters of the Burgers creep model, a simple and practical parameter inversion method is proposed, which can be used to obtain the parameters of the Burgers model for red clay under different perimeter pressures and differing deviatoric stress; and ➂ when comparing the calculation results with the test results, the correlation coefficients R2 of the two are above 0.9, with a good fitting effect, so the model can accurately describe the creep characteristics of red clay from Guilin. This study can provide a theoretical basis and technical support for engineering construction in the red clay area of Guilin.

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Characterization and constitutive modeling of red clay contaminated with ammonium carbonate

Cited by 9 publications

References 53 publications

Characterizing and Modeling the Coupled Hydro-Mechanical Cyclic Behavior of Unsaturated Soils Using Constant Water Content Oedometer and Direct Shear Tests

Characterizing and Modeling the Coupled Hydro-Mechanical Cyclic Behavior of Unsaturated Soils Using Constant Water Content Oedometer and Direct Shear Tests

Consistent Three-Dimensional Elasto-Plastic Model to Study Unsaturated Soil Behavior with Considerations of Coupled Hydro-Mechanical Hysteresis

Creep Properties and Creep Modelling of Guilin Red Clay

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