Disturbed state concept and non-isothermal shear strength model for unsaturated soils

Pham, Tuan A.; Sütman, Melis

doi:10.1007/s10064-022-02688-x

Cited by 11 publications

(2 citation statements)

References 70 publications

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“…The volume of soil particles is supposed to expand with increasing temperature, and therefore, the particle radius is also changed [54,58,59]. The volumetric thermal expansion of a solid particle is considered by the equation below:…”

Section: Temperature-dependent Function Of Particle Sizementioning

confidence: 99%

“…Finally, most published research is devoted separately to the effect of density or temperature on the hydro-mechanical behavior of unsaturated soils. However, there is now broad scope where soils are exposed to both deformations and thermal conditions [24,25,34,58,65,99]. It is therefore necessary to propose an SWCC model considering the combined effect of initial density and temperature to be able to quantify the change in the behavior of unsaturated soils under both mechanical and thermal conditions.…”

Section: Introductionmentioning

confidence: 99%

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Modeling the combined effect of initial density and temperature on the soil–water characteristic curve of unsaturated soils

Pham

Sütman

2023

Acta Geotech.

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The soil–water characteristic curve (SWCC) plays an important role in solving the stability and deformation problems of unsaturated soils. In many practical situations, soils are usually experienced by both deformations and thermal conditions. In this interest, the paper proposes a simple and effective model to predict the combined effect of initial density and temperature on the SWCC and to be able to quantify the changes in thermal-hydro-mechanical behavior of unsaturated soils. In the first step, an initial density-dependent SWCC model is presented using the translation principle between particle-size distribution curve and soil–water characteristic curve. In the second part, a non-isothermal model is proposed to predict the effect of temperature on the SWCC. The key to the non-isothermal model is considering five different temperature-dependent functions, which are surface tension, contact angle, particle-size expansion, void ratio, and water density. On the basis of 22 data sets of thermal volume change, this study also developed further a theoretical correlation between void ratio and temperature that is directly related to soil plasticity. It was observed that the value of the thermal void ratio increases as soil plasticity increases, and there is a nonlinear relationship between the plasticity index and the void ratio. Because of this, soils with high plasticity are more susceptible to volume changes caused by temperature fluctuations than soils with low plasticity. A coupled mechanical–thermal model is then produced which is capable to predict separately or simultaneously the effect of temperature and initial density on SWCC. The proposed model is validated against several test data sets available in the literature. The results show that the proposed model has a good performance in predicting the variation in SWCC with arbitrary temperature and initial density.

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Section: Temperature-dependent Function Of Particle Sizementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling the combined effect of initial density and temperature on the soil–water characteristic curve of unsaturated soils

Pham

Sütman

2023

Acta Geotech.

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Validation, Reliability, and Performance of Shear Strength Models for Unsaturated Soils

2023

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Soil shear strength is the most fundamental property when designing structures in the ground and should be carefully assessed and understood. Several empirical models were introduced to predict the shear strength of unsaturated soils. However, there is uncertainty regarding the applicability and sensitivity of these prediction models. This paper presents a comprehensive verification study to assess the reliability and validity of the existing theoretical models. The results obtained from the prediction models are compared to measured data using thirty experimental data sets. A performance classification program is also conducted to assess the suitability of the analytical models for different soil types as well as over a wide range of matric suctions, saturation degrees, soil densities, soil plasticity, and clay activity. The impact of each single parameter is clarified by the microstructure studies, which also provides insight into the mechanics of unsaturated soils. The results indicated that the applicability of models is more appropriate for sandy soils rather than for clayey ones. The performance of shear strength models tends to decrease with an increase in matric suction, initial density, plasticity index, and clay activity. It is, therefore, recommended that the shear strength estimation models should be carefully selected depending on the soil type and properties. Besides, the analysed results pointed out that the choice to assume the factor $$\chi$$ χ in the equation of Bishop equals the saturation degree is only suitable for medium-dense soils with low matric suction. This assumption is particularly not effective for clayey soils, or dense soils with high matric suction.

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Critical Review of Physical-Mechanical Principles in Geostructure-Soil Interface Mechanics

Pham,

Nadimi,

Sutman

2024

Geotech Geol Eng

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Due to the relatively different mechanical and physical properties of soils and structures, the interface plays a critical role in the transfer of stress and strain between them. The stability and safety of geotechnical structures are thus greatly influenced by the behavior at the soil–structure interface. It is therefore important to focus on the unique characteristics that set the interface apart from other geomaterials while examining the interface behaviour. Understanding the physical mechanism and modelling principles of these interfaces becomes a crucial step for the secure design and investigation of soil-structure interaction (SSI) issues. Moreover, to deal with this soil-environment interaction problem, the classical soil mechanics formulation must be progressively generalised in order to incorporate the effects of new phenomena and new variables on SSI behaviour. Considering the variety of energy geostructures that are emerging nowadays, it is crucial to comprehend the thermo-hydro-mechanical (THM) behaviour of the interface. The objective of this study is to fill this information gap as concisely as possible. A critical review is provided along with the state-of-the-art information on the thermo-hydro-mechanical behaviour of the soil-structure interface, including testing tools and measurement methods, basic principles and deformation mechanisms, constitutive models, as well as their applications in numerical simulations. This study explains how loading influences the mechanisms at the interface and critically examines the effects of boundary conditions, soil properties, environmental factors, and structure type on the THM behaviour of interface zones between soils and structural elements. The validity and reliability of the interface shear stress-displacement models are also covered in this paper. Lastly, the trends and recent advancements are also recommended for the interface research.

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Disturbed state concept and non-isothermal shear strength model for unsaturated soils

Cited by 11 publications

References 70 publications

Modeling the combined effect of initial density and temperature on the soil–water characteristic curve of unsaturated soils

Modeling the combined effect of initial density and temperature on the soil–water characteristic curve of unsaturated soils

Validation, Reliability, and Performance of Shear Strength Models for Unsaturated Soils

Critical Review of Physical-Mechanical Principles in Geostructure-Soil Interface Mechanics

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