Fractional viscoelastic-plastic constitutive model for frozen soil based on microcosmic damage mechanism

He, Junlin; Niu, Fujun; Jiang, Haiqiang; Jiao, Chenglong

doi:10.1016/j.mechmat.2022.104545

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…It was shown that the non-decaying creep process of a frozen silty clay can be reasonably described when the long-term strength is lower than the current stress level. Based on fractional calculus theory, fractional derivative multipliers were embedded into the Nishihara model to describe the non-decaying creep development due to microscopic damage accumulation under constant overloading [23,28].…”

Section: Introductionmentioning

confidence: 99%

A Modified Plastic Burgers Model for the Non-Decaying Creep of Frozen Soils

Yao,

Zhang,

Lin

et al. 2024

Applied Sciences

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A modified plastic Burgers model considering cohesion decay is proposed for frozen soils. A series of triaxial compression and creep tests were conducted on a kind of frozen silty clay for obtaining the model parameters. According to typical triaxial creep strain curves with only a decaying creep stage, a deformation parameter calibration method for a plastic Burgers model is proposed, and the validity of the method was further verified. When the original plastic Burgers model was incorporated with a cohesion decay function, it was shown that the successive development process of frozen soil creep strain from the decaying to non-decaying stage could be described reasonably. The modified model is applicable to frozen ground engineering cases with non-decaying creep involved.

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Section: Introductionmentioning

confidence: 99%

A Modified Plastic Burgers Model for the Non-Decaying Creep of Frozen Soils

Yao,

Zhang,

Lin

et al. 2024

Applied Sciences

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“…The commonly used creep models are mainly classified into empirical and component models (He et al, 2023). The empirical models are established by fitting the creep test data using power functions, logarithmic functions, and fractional linear functions , e.g., the Singh-Mitchell model (Singh and Mitchell,1968).…”

Section: Introductionmentioning

confidence: 99%

Stress-dependent creep behaviour of Neogene red clay in the Chinese Loess Plateau

Zhang,

Zhang

2023

Preprint

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Neogene red clay is a typical weak layer associated with the occurrence of many landslides in the Chinese Loess Plateau. Understanding and modelling the creep behaviour of Neogene red clay is crucial for revealing, forecasting, and preventing landslides. However, there is still a lack of appropriate descriptions for the stress-dependent creep behaviour of Neogene red clay. To remedy this issue, a series of direct shear creep tests for saturated Neogene red clay are performed. Test results show that saturated Neogene red clay exhibits apparent creep deformation and that its creep behaviour is closely associated with shear stress and normal stress. Based on the test observations, the parameters of the classic Burgers creep model are modified by considering the effect of normal stress, and a stress-dependent Burgers creep model is proposed. The proposed model includes eight parameters that can be conveniently calibrated using laboratory tests. A comparison of model predictions and test data for saturated Neogene red clay is performed to validate the model performance in describing the stress-dependent creep behaviour. The discussion provides an explanation for the creep mechanism of the loess–Neogene red clay landslide in terms of the stress-dependent creep behaviour of saturated Neogene red clay.

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“…Sun et al [25] proposed an elastoplastic damage constitutive model based on super/sub-loading yield surface and verified the model by observing the mechanical behavior of frozen soil and frozen saline soil through the triaxial compression test. He et al [26] established a new composite structure fractional constitutive model by establishing the creep relationship between the bonding unit and the friction unit based on the microscopic damage mechanism of frozen soil. The above research shows that scholars have limited research on the damage evolution of soil to only from a single direction, and there is almost no research on deep soil.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties of Deep Expansive Soil and Coupling Damage Model of Freeze–Thaw Action and Loading

Zhu,

Lin,

Chen

2023

Applied Sciences

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This study is primarily intended to present a damage constitutive equation under the combined action of confining pressures and freeze–thaw cycles by subjecting deep expansive clay to the consolidated undrained triaxial tests. We study the influence of the numbers of freeze–thaw cycles on various mechanical indexes of soil by using the TSZ-2 instrument (fully automatic triaxial instrument). As the number of freeze–thaw cycles increases, the ultimate peak stress of the soil decreases, and then, the effect of the freeze–thaw effect on the shear strength gradually weakened. By combining the expression method of the damage variable under the action of loading alone with the expression method under the action of freeze–thaw cycles alone, we brought in the damage evolution equation to obtain the damage constitutive equation under the combined action of confining pressures and freeze–thaw cycles. The stress values under three confining pressures (100 kPa, 200 kPa, and 300 kPa) can be determined by using the final damage constitutive model. The measured data with a water content of 17% and six freeze–thaw cycles were compared with the theoretical data. The actual strength values were 118.4 kPa, 152.3 kPa, and 184.1 kPa, and the theoretical strength values were 120 kPa, 150 kPa, and 186 kPa. The fitting degree of the strength value was as high as 99%, which verifies the feasibility of this model. This study can serve as an available reference for well wall construction and disaster prediction in deep coal mining.

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Fractional viscoelastic-plastic constitutive model for frozen soil based on microcosmic damage mechanism

Cited by 9 publications

References 41 publications

A Modified Plastic Burgers Model for the Non-Decaying Creep of Frozen Soils

A Modified Plastic Burgers Model for the Non-Decaying Creep of Frozen Soils

Stress-dependent creep behaviour of Neogene red clay in the Chinese Loess Plateau

Study on Mechanical Properties of Deep Expansive Soil and Coupling Damage Model of Freeze–Thaw Action and Loading

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