Multiaxial creep of frozen loess

Zhou, Zhiwei; Ma, Wei; Zhang, Shujuan; Du, Haimin; Mu, Yanhu; Li, Guoyu

doi:10.1016/j.mechmat.2015.11.020

Cited by 150 publications

(48 citation statements)

References 24 publications

(32 reference statements)

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“…However, conventional polyolefin separators are intrinsically poorly compatible with electrolytes, due to their hydrophobic surface character and low surface energy, which result in low electrolyte uptake and poor lithium ion conductivity [11][12][13][14]. In addition, many external conditions also affect the performance of materials, such as freezing, heat, physical design, and chemical corrosion [7,11,[15][16][17]. To overcome the poor hydrophilicity of polyolefin separators, many efforts have been made to characterize the electrochemical performances and mechanical properties, such as the plasma modified graft [18], ultraviolet irradiation [19], and electron beam irradiation [20].…”

Section: Introductionmentioning

confidence: 99%

Self-Polymerized Dopamine Nanoparticles Modified Separators for Improving Electrochemical Performance and Enhancing Mechanical Strength of Lithium-Ion Batteries

et al. 2020

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Separators in lithium-ion batteries (LIBs) play an important role for battery safety, so stable electrochemical performance and high mechanical strength of separators will always be of interest. On the basis of the fact that polydopamine (PDA) nanoparticles found in mussel have a strong adhesion ability, biomaterial surface nanoparticles modification methods are developed to increase electrochemical performance and enhance mechanical strength of polypropylene (PP) and polypropylene/polyethylene/polypropylene (PP/PE/PP) separators. The electrolyte uptake performance, ionic conductivities, discharging rate capabilities, yield stresses, and failure strains of PP and PP/PE/PP separators are all enhanced remarkably by PDA modification. Thermal shrinkage results show that thermal stabilities and the shrinkage percentage of PDA-modified separators are improved. The electrochemical testing results conclude that the discharging capacities of PP (increased by 3.77%~187.57%) and PP/PE/PP (increased by 2.31%~92.21%) separators increase remarkably from 0.1 C to 5.0 C. The ionic conductivities of PDA-modified PP and PP/PE/PP separators are 1.5 times and 6.1 times higher than that of unmodified PP and PP/PE/PP separators, which in turn increase the electrolyte uptake and ionic migration. In addition, mechanical properties of PP (yield stresses: 17.48%~100.11%; failure stresses: 13.45%~82.71%; failure strains: 4.08%~303.13%) and PP/PE/PP (yield stresses: 11.77%~296.00%; failure stresses: 12.50%~248.30%; failure strains: 16.53%~32.56%) separators are increased greatly.

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Section: Introductionmentioning

confidence: 99%

Self-Polymerized Dopamine Nanoparticles Modified Separators for Improving Electrochemical Performance and Enhancing Mechanical Strength of Lithium-Ion Batteries

et al. 2020

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“…e honeycomb structure of loess soil accompanied with a large amount of micropores has not weakened the characteristics of high shear strength of loess soil [25][26][27][28][29]. Its structural characteristics of incomplete consolidation and water sensitivity are closely related to the collapsibility [30][31][32][33][34]. Under the effects of external load and water, loess soil exhibits crushing, rolling, and sliding, which causes change in loess particle distribution, number, shape, size, and arrangement.…”

Section: Introductionmentioning

confidence: 99%

Disturbance Evolution Behavior of Loess Soil under Triaxial Compression

Guo

2020

Advances in Civil Engineering

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This paper presents an investigation into the evolution law of the structural effects of Xi’an loess soil, based on the disturbed state concept. First, a series of consolidated and drained triaxial compression tests were performed on undisturbed and remoulded loess samples prepared at five different moisture contents and tested at four different confining pressures. Second, two disturbance functions with different parameters were proposed to quantify mathematically the structural effects of loess. Finally, the proposed disturbance functions were validated against documented test results by other researchers. The results indicated that the single-parameter disturbance function, with the deformation modulus as its parameter, provides convenience for application but takes no account of the respective contributions of deviatoric stress and mean stress to the disturbance evolution behavior of loess. The double-parameter disturbance function, with the shear and bulk moduli as its parameters, is capable of distinguishing these respective contributions and reflects well the disturbance evolution behavior of loess under various moisture contents and confining pressures. The effects of moisture content and confining pressure on the parameters of the disturbance functions were found to be unsteady. The proposed disturbance functions lay the foundation for establishing a constitutive model for loess accounting for the structural effect.

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“…As a result, the ice-soil wall could significantly deform under rock pressure [2]. A lot of experimental studies have been carried out to study time-dependent deformation of frozen soil under uniaxial and multiaxial compression tests [1][2][3][4][5][6][7][8][9][10]. Creep deformation of frozen soil depends on long-term strength limit [3].…”

Section: Introductionmentioning

confidence: 99%

“…In [4] from uniaxial creep tests of warm ice-rich sand it has been established that creep characteristics are affected by small temperature variation. In [5,6] on the basis of triaxial tests it has been shown that a decrease of temperature leads to an improvement of strength properties. In [7] a study of an influence of thermal gradient on the frozen sand has been carried out.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of application limits of Vyalov’s formula for an ice-soil thickness

Zhelnin

Kostina²,

Plekhov³

et al. 2019

Frattura Ed Integrità Strutturale

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Artificial ground freezing is an efficient technique which allows one to sink the mine shafts under complex hydrogeological conditions. The aim of artificial ground freezing is a creation of a temporary wall of frozen soil around the intended excavation. To estimate an optimal thickness of an ice-soil wall, the Vyalov's formula is widely used by engineers. The article is devoted to analysis of Vyalov's formula on the basis of the numerical simulation. The numerical simulation has been conducted by the finite element method. For the simulation of a stress-strain state of an ice-soil wall a new computational scheme has been proposed. The scheme is based on Vyalov's design layout for a vertical shaft sinking and takes into account a soil layer beyond the excavation bottom. A mechanical behavior of frozen soil is described by Vyalov's constitutive relations. As a result, it has been shown that values of the wall thickness given by Vyalov's formula do not agree with the ones obtained by the numerical simulation. In order to conform results given by Vyalov's formula and the numerical simulation, two modifications of the formula have been proposed.

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Multiaxial creep of frozen loess

Cited by 150 publications

References 24 publications

Self-Polymerized Dopamine Nanoparticles Modified Separators for Improving Electrochemical Performance and Enhancing Mechanical Strength of Lithium-Ion Batteries

Self-Polymerized Dopamine Nanoparticles Modified Separators for Improving Electrochemical Performance and Enhancing Mechanical Strength of Lithium-Ion Batteries

Disturbance Evolution Behavior of Loess Soil under Triaxial Compression

Numerical analysis of application limits of Vyalov’s formula for an ice-soil thickness

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