Fractional derivative-based creep constitutive model of deep artificial frozen soil

Li, Dongwei; Zhang, Chaochao; Ding, Guoyu; Zhang, Hua; Chen, Junhao; Cui, Hao; Pei, Wansheng; Wang, Shengfu; An, Lingshi; Li, Peng; Yuan, Chang

doi:10.1016/j.coldregions.2019.102942

Cited by 28 publications

(17 citation statements)

References 21 publications

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“…According to the elastic theory of porous materials, He et al 13 developed a statistical constitutive damage model to investigate the rock damage characteristics under water pressure. Li et al 14 carried out Laplace transform on the basis of the Nishihara model, established the fractional derivative creep constitutive model of artificial frozen soil, and deduced the flexible parameter matrix of the model by Newton iteration method. After a large number of creep tests, Wei et al 15 analyzed the creep characteristics of columnar jointed basalt rock mass.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Ya-feng

Cheng

Lin

et al. 2021

Sci Rep

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The creep characteristics of frozen rock and soil are crucial for construction safety in cases of underground freezing. Uniaxial compression tests and uniaxial creep tests were performed at temperatures of − 10, − 15, − 20, and − 25 °C for silty clay used in Nantong metro freezing construction to investigate the effect law of the stress–strain curves and creep curves. However, owing to the complex effects of factors such as temperature and ground pressure, the mechanical properties of underground frozen silty clay are uncertain. The Burgers creep damage model was established by using an elastic damage element to simulate the accelerated creep stage. The traditional particle swarm optimization algorithm was improved using the inertia weight and the fuzzy random coefficient. The creep parameters of the Burgers damage model were optimized using the improved fuzzy random particle swarm algorithm at different temperatures and pressure levels. Engineering examples indicated that the optimized creep model can more effectively characterize the creep stages of frozen silty clay in Nantong metro freezing construction. The improved fuzzy random particle swarm algorithm has wider engineering applicability and faster convergence than the traditional algorithm.

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Section: Introductionmentioning

confidence: 99%

Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Ya-feng

Cheng

Lin

et al. 2021

Sci Rep

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“…The depth of the permafrost in the Arctic can exceed one kilometer [12], but the deep permafrost is difficult to be drilled and sampled [13], which restricts the process of related scientific investigation. To solve these problems, the mechanics experiments of deep frozen soil [14][15][16] and frozen rock [17][18][19] have been widely studied, whereas little attention has been paid to the coupling problems of icesoil and ice-rock and the mechanical characteristics of the ice in deep environment are the basis of the above problems. Compared with the shallow layer conditions, the formation pressure of deep underground surges dramatically; coupled with the ground restrictions imposed on frost heave, the freezing pressure of deep underground water may be above 10 MPa.…”

Section: Introductionmentioning

confidence: 99%

Freezing Pressurized Water into a Standard Cylindrical Ice Sample in a Triaxial Cell

et al. 2021

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The mechanical characteristics of high-pressure frozen ice are a basis for the design of deep underground frozen walls, the drilling of thick permafrost and ice sheets, and the probing of extraterrestrial ice. The continuous control of the sample stress state from freezing to testing is essential for the experimental study of in situ mechanical response of high-pressure frozen ice. In the context, we developed a preparation technique for freezing pressurized water into a standard cylindrical ice sample in a triaxial cell. Through theoretical analysis, a cylindrical water sample with precise dimensions and strong sealing was fabricated using heat shrinkable tubing, sectional end caps, and an assembly cylinder. A mounting device was designed to insert the water sample into the triaxial cell without deformation. In order to deal with the lateral surface irregular of the resulting ice sample caused by freezing expansion, we proposed a pressurization method in which the volume of the confining medium is controlled to restrict the radial deformation of the sample, and the axial pressure on the sample is kept constant; thus, the freezing expansion will develop along the height direction through releasing the expansion pressure. Based on the analysis of sample deformation and finite element numerical simulations, the control method of the temperature fields of the sample and the confining medium was obtained, and the standard cylindrical ice sample which satisfies the geometric accuracy requirements was produced. The comparison of ice samples frozen by different freezing methods showed that the control of the confining medium mean temperature and the sample unidirectional freezing is necessary to improve the dimensional precision of the ice sample.

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“…Li et al proposed a fractional derivative constitutive model of deep artificial frozen soil which was established based on the Nishihara model. is fractional derivative constitutive model was verified to describe the nondecaying creep deformation characteristics of deep artificial frozen soil under high confining pressures [23]. Yao et al proposed a three-dimensional model for clays adopting a unified hardening parameter independent of stress paths, and it can be used to well simulate stress-strain relationships, shear dilatancy, strain-hardening and softening, and stress path dependence behaviour of overconsolidated clays [24].…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Turfy Soils under Confining and Axial Pressure Increases Stress Paths in Jilin Province, Northeast China

Huang

Liu

et al. 2021

Advances in Civil Engineering

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In recent years, highways have been built rapidly in China’s turfy swamp areas to accommodate economic development. Turfy soil is a type of special soil with high humus and incompletely decomposed plant contents, so its properties are complex and unique. Both the axial and confining pressures of turfy soil increase during embankment filling. Therefore, in this study, three soil tests for analysing the decomposition degree, organic matter content, and triaxial compression under confining and axial pressure increases stress paths were performed to achieve insights into the stress-strain properties of turfy soil. The volumetric and deviatoric strains of turfy soil were summarised to reveal the inner mechanisms of turfy soil, culminating in the establishment of a constitutive model for turfy soil. The results of the constitutive model were compared with the experimental test results to verify the accuracy of the constitutive model. The results showed that the stress-strain and strength of turfy soil are closely related to the organic matter content and decomposition degree. The calculated stress and strain results are also consistent with the experimental results, indicating that this constitutive model can be used to better indicate the original deformation state and strength characteristics of the turfy soil.

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Fractional derivative-based creep constitutive model of deep artificial frozen soil

Cited by 28 publications

References 21 publications

Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Freezing Pressurized Water into a Standard Cylindrical Ice Sample in a Triaxial Cell

Physical and Mechanical Properties of Turfy Soils under Confining and Axial Pressure Increases Stress Paths in Jilin Province, Northeast China

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