Constitutive Modeling Including Creep- and Rate-Dependent Behavior and Testing of Glacial Tills for Prediction of Motion of Glaciers

Desai, C. S.; Sane, S. M.; Jenson, John W.

doi:10.1061/(asce)gm.1943-5622.0000091

Cited by 26 publications

(7 citation statements)

References 14 publications

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“…This continuing undrained creep may often result in a collapse of the clay foundation, which implies that the undrained shear strength can be significantly reduced with time, as investigated through undrained triaxial creep tests by various researchers (Casagrande and Wilson 1951;Walker 1969;Holzer et al 1973;Vaid and Campanella 1977;Adachi and Oka 1982;Yin et al 2002;Hinchberger and Rowe 2005;Yin and Hicher 2008;Yin et al 2010bYin et al , c, 2011Desai et al 2011;Taechakumthorn and Rowe 2012). Therefore, it is important to capture the undrained-creep behavior to estimate the long-term stability of geotechnical structures.…”

Section: Introductionmentioning

confidence: 99%

Stress Dilatancy of Natural Soft Clay under an Undrained Creep Condition

Wang

Yin

2015

Int. J. Geomech.

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The stress-dilatancy relationship is a key point to capture the evolution of both strains and excess pore pressure during an undrained creep of natural soft clay. This paper focuses on investigating the stress dilatancy of natural soft clay during an undrained creep. Undrained triaxial creep tests are performed on K 0 -consolidated and isotropically consolidated samples of a typical Chinese soft marine clay with different stress levels. A unique stress-dilatancy curve is obtained from all test results. Several typical stress-dilatancy relations for soils are discussed, comparing them with experimental results. A common modification method for the stress dilatancy of sand is adopted and discussed for clay. All comparisons demonstrate that modified dilatancy equations can describe the stress-dilatancy relationship during an undrained creep. The modified dilatancy equation with the inclination of a potential surface seems to better describe the whole trend, and is suitable for natural soft clay.

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Section: Introductionmentioning

confidence: 99%

Stress Dilatancy of Natural Soft Clay under an Undrained Creep Condition

Wang

Yin

2015

Int. J. Geomech.

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“…From the aspect of the stress path, the mechanical properties of soft soil can be divided into loading mechanical properties and unloading mechanical properties. During early research, axial loading strength and deformation parameters were widely obtained and used in the numerical analysis of unloading engineering, resulting in large errors in theoretical calculation results and engineering accidents [8]. Currently, theoretical research shows that, in addition to the initial consolidation pressure, the mechanical properties of soft soil are closely related to the stress path [9,10]; therefore, in the study of the unloading excavation process in soft soil areas, it has become a research consensus for scholars to consider the influence of the unloading stress path on the mechanical properties of the soft soil.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Soft Soil considering the Influence of Unloading Stress Paths

Huang

et al. 2021

Advances in Civil Engineering

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The mechanical properties of soft soil are crucial for the design and construction of underground space excavation; however, the current design and numerical analysis of underground spaces consider the loading mechanical parameters, ignoring the influence of the unloading stress path resulting in frequent construction accidents in practice. Here, soft soil in Shenzhen, China, is taken as the research subject, and a series of consolidated-undrained unloading tests are performed. First, K0 consolidation is conducted. Then, unloading tests are performed with different unloading ratios to simulate different unloading stress paths. The test results show that the soft soil deformation characteristics are closely related to the stress path and unloading ratio. Under different unloading ratios, soft soil will undergo compression deformation or rebound deformation. Under unloading conditions, the deviator stress-strain curve satisfies a hyperbolic function and can be normalized with the average consolidation confining pressure. With the increase in the unloading ratio, the initial tangent modulus first decreases and then increases, the cohesion decreases, and the internal friction angle does not change significantly. The loading mechanical parameters are not suitable for numerical calculation in unloading engineering. In this paper, more unloading paths are considered, such as UU1.0 and UU0.5. The results of the study provide a theoretical basis for the calculation of the numerical analysis of the soil body at different depths in rich soft soil pits.

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“…According to its stress path, the creep constitutive model of soft soil can be divided into the loading creep constitutive model and the unloading creep constitutive model [7]. e creep constitutive models under loading were studied previously, and research results were applied to the numerical analysis of unloading excavation of the underground space in soft soil, resulting in a large gap between the calculated results and the actual situation [8,9]. erefore, it had become a common practice among scholars to study unloading excavation of the underground space of soft soil by constructing the unloading creep constitutive model based on the unloading stress path.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model of Lateral Unloading Creep of Soft Soil under Excess Pore Water Pressure

Huang

Wen

Deng

et al. 2020

Mathematical Problems in Engineering

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Presented in this paper is a study on the lateral unloading creep tests under different excess pore water pressures. The marine sedimentary soft soil in Shenzhen, China, was selected in this study. The results show that the excess pore water pressure plays a significant role in enhancing the unloading creep of soft soil. Higher excess pore water pressure brings more obvious creep deformation of soft soil and lower ultimate failure load. Meanwhile, the viscoelastic and the viscoplastic modulus of soft soil were found to exponentially decline with creep time. A modified merchant model and a combined model of the modified merchant model and plastic elements are used to simulate the viscoelastic and the viscoplastic deformation, respectively. Therefore, a lateral unloading creep model of soft soil is developed based on the modified merchant model. The accuracy and applicability of this model were verified through identifying the parameters in the model. Research results are of particular significance to the numerical simulation of underground space excavation in soft soil areas which considers the effects of excess pore water pressure.

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Constitutive Modeling Including Creep- and Rate-Dependent Behavior and Testing of Glacial Tills for Prediction of Motion of Glaciers

Cited by 26 publications

References 14 publications

Stress Dilatancy of Natural Soft Clay under an Undrained Creep Condition

Stress Dilatancy of Natural Soft Clay under an Undrained Creep Condition

Mechanical Properties of Soft Soil considering the Influence of Unloading Stress Paths

Constitutive Model of Lateral Unloading Creep of Soft Soil under Excess Pore Water Pressure

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