Modified State Surface Approach to Study Unsaturated Soil Hysteresis Behavior

Riad, Beshoy; Zhang, Xiong

doi:10.1177/0361198120937014

Cited by 4 publications

(8 citation statements)

References 58 publications

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“…Zhang & Lytton [5] extended the MSSA for the coupled hydro-mechanical behaviour of unsaturated soils. Riad & Zhang [17,29] further extended the MSSA to include the coupled hydromechanical hysteresis for unsaturated soils. In this paper, only the relationships for volume changes in soil structure are discussed.…”

Section: Modified State Surface Approachmentioning

confidence: 99%

Calibration of BBM Parameters using the Modified State Surface Approach

2023

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The Barcelona Basic Model (BBM) developed by Alonso et al. [1] is the first and the mostwidely used elasto-plastic model for unsaturated soils. The BBM successfully explained many key features of unsaturated soils and received extensive acceptance. However, there is lack of a well-establishedmethod for selecting parameter values for the BBM from laboratory tests, although a variety of methods have been recently developed for calibrating model parameters for the BBM. Concerns still exist on the correctness and robustness of such parameter value selection procedures. The above statements were evidenced by a recent benchmark exercise on selection of parameter values for the BBM organized within a "Marie Curie" Research Training Network on "Mechanics of Unsaturated Soils for Engineering"(MUSE)[2]. Experienced constitutive modelers in unsaturated soils from 7 prestigious teams were provided with the same experimental results on an unsaturated soil to calibrate the parameter values in the BBM. Theoretically, the calibrated parameters from different teams are expected to be the same or at leastvery close. However, the selected parameter values by the 7 teams are surprisingly widely different. This paper first discussed the limitations in the existing methods to calibrate the parameter values in the BBM. A novel approach was then proposed to calibrate the parameter values for the BBM. The approach takes advantage of the close-form solution of the BBM, which is derived based upon a newly proposed Modified State Surface Approach to study the unsaturated soils [3-6]. The same experimental data, used in the MUSE benchmark exercise, were reanalysed using the proposed approach to calibrate parameters for the BBM. The results were compared with those in the MUSE benchmark exercise from which thesimplicity, effectiveness, and robustness of the proposed method were evaluated.

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Section: Modified State Surface Approachmentioning

confidence: 99%

Calibration of BBM Parameters using the Modified State Surface Approach

2023

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“…Recently, Riad and Zhang ( 42 ) further extended the MSSA to study the hydro-mechanical hysteresis behavior of unsaturated soils under isotropic conditions. The main goal was to consider the cyclic traffic mechanical loads and the hydraulic behavior as a result of seasonal climatic changes.…”

Section: Modified State Surface Approach: An Overviewmentioning

confidence: 99%

“…The soil mechanical and hydraulic hysteresis behavior can be easily considered by adopting the approach proposed by Riad and Zhang ( 42 ) and expressed incrementally in Equations 28 and 29. Three additional model parameters will be added to account for the hysteresis behavior ( H u = 2 , A = 3 . 0 , and B = 0 . 92 ).…”

Section: Model Validation Under Isotropic Conditionsmentioning

confidence: 99%

“…The calibrated parameters used in this simulation are listed in Table 1(bentonite-kaolinite mixture used by Sharma [ 40 ]). To consider the hysteresis behavior, the approach proposed by Riad and Zhang ( 42 ) and expressed incrementally in Equations 28 and 29 is considered. Three additional model parameters will be added to account for the hysteresis behavior ( H u = 668 . 15 , A = 0 . 47 , and B = 2 . 56 ).…”

Section: Model Validation Under Isotropic Conditionsmentioning

confidence: 99%

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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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“…The original MSSA (69)(70)(71) was based on critical state soil mechanics in which the soil hysteresis behavior was neglected. Recently, Riad and Zhang (73) extended the MSSA to account for coupled hydro-mechanical behavior considering both hydraulic and mechanical hysteresis. It is worth noting that mechanical hysteresis is neglected by most of the existing models.…”

mentioning

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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Modified State Surface Approach to Study Unsaturated Soil Hysteresis Behavior

Cited by 4 publications

References 58 publications

Calibration of BBM Parameters using the Modified State Surface Approach

Calibration of BBM Parameters using the Modified State Surface Approach

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

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

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