Cyclic Elastoviscoplastic Constitutive Model for Clay Considering Nonlinear Kinematic Hardening Rules and Structural Degradation

Kimoto, Sayuri; Shahbodagh, Babak; Mirjalili, Mojtaba; Oka, Fusao

doi:10.1061/(asce)gm.1943-5622.0000327

Cited by 39 publications

(23 citation statements)

References 13 publications

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“…The first is the traditional theoretical method, including the elasto-plastic [7,16] and elasto-visco-plastic models [30,31], where the deformation of each loading cycle is strictly counted. This method reveals the deformation mechanism of soils subjected to cyclic loading.…”

Section: Cyclic Loading Conditionmentioning

confidence: 99%

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

et al. 2015

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Many constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then a modified elastoplastic constitutive model is proposed for evaluating the long-term deformation of granular soils under cyclic loading by incorporating the concept of factional calculus. To describe the flow direction of granular soils under cyclic loading, a cyclic flow potential considering particle breakage is used. Test results of several types of granular soils are used to validate the model performance. Abstract Lots of constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then a modified elasto-plastic constitutive model is proposed for evaluating the long-term deformation of granular soils under cyclic loading by incorporating the concept of factional calculus. To describe the flow direction of granular soils under cyclic loading, a cyclic flow potential considering particle breakage is used. Test results of several types of granular soils are used to validate the model performance.

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Section: Cyclic Loading Conditionmentioning

confidence: 99%

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

et al. 2015

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“…We introduced the hydrate saturation dependency on the stress-strain behavior to a cyclic elasto-viscoplastic model based on overstress type viscoplastic theory with the nonelinear kinematic hardening rules and the structural degradation for solid skeleton (Kimoto et al 2013). The elastic behavior is given by a generalized Hooke type of law.…”

Section: Constitutive Equationsmentioning

confidence: 99%

Numerical analyses of dynamic behavior of seabed ground during methane hydrate production

Akaki¹,

Kimoto²

2017

JGS Special Publication

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Oceanic methane hydrates are now viewed as energy resource because they contain rich methane. However, they generally exist in relatively shallow and uncemented seabed ground layer, thus large deformation and degradation of seabed sediments may occur during gas production from methane hydrate bearing sediments. Moreover, because they are often found in seismically active regions, including the Nankai Trough area of Japan, there is a risk of large earthquakes during gas production. Seabed sediments damaged by gas production may become trigger of disasteres like seabed slides. Furthermore, effects of pore pressure change induced by earthquake on methane hydrate dissociation behavior are also curious problem. In the present study, we have shown a numerical method which can simulate the seismic and chemo-thermo-mechanical coupled behaviors of seabed grounds during gas production, such as phase changes from hydrates to water and gas, temperature changes, ground deformation and the flow of pore fluids. Numerical analyses are performed for the hydrate-bearing sediments at the Daini-Atsumi knoll, Eastern Nankai Trough, Japan, where the world's first offshore production test of methane hydrates was conducted using a predicted Nankai Trough Earthquake for investigating the earthquake-induced dynamic behavior during gas production. From the results, effects of gas production on mechanical behavior of seabed grounds during earthquake is small for this ground conditions. Small increase of the pore pressure due to methane hydrate dissociation during earthquake results in temporal stability of methane hydrates.

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“…The constitutive model adopted to express must be able to explain the deformation characteristics of the soil skeleton under cyclic loading conditions [11,[17][18].…”

Section: Constitutive Equationsmentioning

confidence: 99%

Effect of hydraulic hysteresis on dynamic response of unsaturated soils

2016

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Starting from the conservation laws, field equations governing the dynamic behaviour of unsaturated soils are presented. The coupling between solid and fluid phases is enforced according to the effective stress principle taking suction dependency and volume change of the effective stress parameters into account. The hydraulic hysteresis is accounted for through the effective stress parameter and the soil water characteristic curve. The spatial discretization of the governing equations is achieved using finite element method, whereas the time integration is conducted using the Newmark scheme. The numerical results are then presented, and the effect of hydraulic hysteresis on dynamic response of unsaturated soils is particularly emphasized.

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Cyclic Elastoviscoplastic Constitutive Model for Clay Considering Nonlinear Kinematic Hardening Rules and Structural Degradation

Cited by 39 publications

References 13 publications

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

Numerical analyses of dynamic behavior of seabed ground during methane hydrate production

Effect of hydraulic hysteresis on dynamic response of unsaturated soils

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