Evaluation of strain and stress states of a compacted highly expansive soil using a thin-walled oedometer

Abbas, Mohamed Farid; Elkady, Tamer Y.; Al‐Shamrani, Mosleh

doi:10.1016/j.enggeo.2015.04.012

Cited by 19 publications

(3 citation statements)

References 14 publications

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“…erefore, the LP caused by vertical stress would also increase with the decreased matric suction. Besides, the lateral swelling pressure of expansive soil produced during this wetting process, which also increased with the vertical pressure [20,30], so the double effect of lateral swelling pressure and the LP caused by vertical stress all led to the growth of LP with the increased NNS.…”

Section: Results Analysismentioning

confidence: 93%

“…A similar apparatus with lateral strain compensation was developed for testing compacted clay samples with different initial densities under constant vertical pressure; the results showed that the lateral swelling pressure increased as initial density increased. Avsar et al [13], Windal and Shahrour [18], Monroy et al [19], and Abbas et al [20] also used the same technique to investigate the lateral pressure and the axial strain. Besides, the hydraulic triaxial apparatus that the stress could be controlled in both axial and radial direction [21][22][23][24] and 3D swelling shrinkage apparatus that the boundary condition could be changed [25][26][27] were also commonly used to investigate the volume change behavior of expansive soil after hydration.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Liu

Zhang

Liu

et al. 2021

Advances in Materials Science and Engineering

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Evaluation of swelling behavior is important for designing structures in expansive soils areas, especially for highway that the swelling pressure generated upon pavement and retaining structures in both vertical and horizontal directions due to infiltration. In this study, modification was made on unsaturated consolidation oedometer to provide synchronized measurement of vertical swelling strain (VSS) and lateral pressure (LP) of expansive soil under constant net normal stress and controlled matric suction. Vertical swelling (VS) test and lateral swelling (LS) test were conducted to investigate the anisotropic swelling behavior. The influence of mean net stress and net stress ratio on VSS was investigated, and the anisotropic swelling behavior of unsaturated expansive soil was characterized using anisotropic swelling ratio. The results show that the VSS nonlinearly decreased as the mean net stress increased and increased as the net stress ratio increased. The expansive soil would rapidly enter the passive state due to lateral swelling pressure under relatively low surcharge, with major principal axis rotating from vertical direction to lateral direction, which advances the possibility of passive failure for light retaining structures. The anisotropic swelling behavior objectively exists and varies with matric suction and net normal stress, which should not be ignored for engineering application.

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Section: Results Analysismentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Liu

Zhang

Liu

et al. 2021

Advances in Materials Science and Engineering

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“…By using the modified oedometer apparatus, researchers have consistently found that measured lateral pressures exceed those in the vertical direction under inundation conditions. Additionally, the ratio of swelling pressure in the vertical and lateral directions varies with the surcharge, moisture, and density of the soil specimens [27,28]. This inherent material anisotropy is not fully considered in common isotropic constitutive formulations.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Test and Constitutive Model for Quantifying the Anisotropic Swelling Behavior of Expansive Soils

Liu,

Zhang,

Lan

et al. 2024

Applied Sciences

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Expansive soils exhibit directionally dependent swelling that traditional isotropic models fail to capture. This study investigates the anisotropic swelling characteristics of expansive soil with a medium swelling potential through the use of modified oedometric testing. Vertical swelling strains can reach up to 1.71 times that of the horizontal movements, confirming intrinsic anisotropy. A nonlinear elastic constitutive model incorporates vertical and horizontal elastic moduli with respect to matric suction to characterize anisotropy. Three elastic parameters were determined through the experiments, and predictive equations were developed to estimate the unsaturated moduli. The constitutive model and predictive techniques provide practical tools to better assess expansive soil pressures considering anisotropy, offering guidelines for utilization and design. The outcomes advance understanding of these soils’ directionally dependent behavior and stress–strain–suction response.

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Influence of Applied Boundary Condition During Wetting on Volume Change Characteristics of a Compacted Highly Expansive Soil

Abbas

Al‐Shamrani

Elkady

2017

Sustainable Civil Infrastructures

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Evaluation of strain and stress states of a compacted highly expansive soil using a thin-walled oedometer

Cited by 19 publications

References 14 publications

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Laboratory Test and Constitutive Model for Quantifying the Anisotropic Swelling Behavior of Expansive Soils

Influence of Applied Boundary Condition During Wetting on Volume Change Characteristics of a Compacted Highly Expansive Soil

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