A thermodynamically consistent framework for visco-elasto-plastic creep and anisotropic damage in saturated frozen soils

Sun, Yongkui; Weng, Xiaolin; Wang, Weilong; Niu, Haoshuang; Li, Hao; Zhou, Rongming

doi:10.1007/s00161-020-00885-1

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…On short term behaviour, extensive laboratory investigations have shown that the mechanical behaviour of clay rocks can be characterised by coupled plastic damage 11 . Concerning long term behaviour, time‐dependent creep deformation constitutes another important feature of clay rocks 3,12–15 . Classically, the time‐dependent inelastic deformation of a material is described by phenomenological viscoplastic models (e.g., Bui et al 16 …”

Section: Introductionmentioning

confidence: 99%

“…11 Concerning long term behaviour, time-dependent creep deformation constitutes another important feature of clay rocks. 3,[12][13][14][15] Classically, the time-dependent inelastic deformation of a material is described by phenomenological viscoplastic models (e.g., Bui et al 16 ; Sun et al 17 ). Although these models provide efficient mathematical tools for the long-term analyses of structures, the physical mechanisms of creep deformation are not explicitly considered.…”

Section: Introductionmentioning

confidence: 99%

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Modelling the time‐dependent mechanical behaviour of clay rocks based on meso‐ and micro‐structural viscous properties

Sun,

Pardoen,

van den Eijnden

et al. 2023

Num Anal Meth Geomechanics

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Clay rocks are multiphase porous media having a complex structure and behaviour characterised by heterogeneity, damage and viscosity, existing on a wide range of scales. The mesoscopic scale of mineral inclusions embedded in a clay matrix has an important role in the mechanisms of deformation under mechanical loading by cracking and creeping. This study introduces a micromechanical approach to model the time‐dependent mechanical behaviour of clay rocks. A heterogeneous clay rock is represented at the mesoscopic scale as a composite material consisting of rigid elastic mineral inclusions (quartz, calcite and pyrite) embedded in a clay matrix. To describe the damageable rock behaviour and its failure modes at the small scale, interfaces between different mineral phases and within the clay matrix are considered. Viscous effects are incorporated inside the clay aggregates, with intergranular microfractures propagating in the clay matrix, in order to investigate their contribution to the creep behaviour of clay rock at the macroscale. The mesostructure of the clay rock is represented in digital 2D Representative Elementary Areas (REAs). The overall mesoscale behaviour of the clay rock under mechanical solicitation is numerically obtained from the REA by computational homogenisation within a two‐scale finite element squared framework. Then, the model is validated at mesoscale against experimental data. The variability of the material response and the time evolution of the mineral interfacial damage state are investigated in relation to the small‐scale properties and failure, while considering mesostructure variability. The results can give some valuable insights into creep behaviour of the clay rock from a small‐scale perspective.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling the time‐dependent mechanical behaviour of clay rocks based on meso‐ and micro‐structural viscous properties

Sun,

Pardoen,

van den Eijnden

et al. 2023

Num Anal Meth Geomechanics

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“…As a typical representative of deep foundation, pile foundation stand out as a quintessential choice and find wide applications in multifarious complex foundation scenarios. In challenging geological areas, such as collapsible soil 2 , expansive soil 3 , frozen soil 4 , the stress relationship between pile and soil will change with the change of soil engineering properties. Frozen soil, in particular, represents an anisotropic, heterogeneous, multiphase complexity, which is composed of solid soil particles, liquid water, gas and ice.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Yu,

Cao,

Zhao

2023

Sci Rep

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The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test piles, each with a length of 15 m and a diameter of 1.0 m, were poured based on the actual bridge construction project in the permafrost region of Daxing'an Mountains in China. Based on the temperature data between the piles and soil, the refreezing state of the pile foundation was comprehensively judged. Subsequently, the static method was employed to assess the friction resistance values and single pile bearing capacity of each soil layer on the pile side under different freezing states before and after the pile foundation refreezing. Building upon these findings, the restrictive parameters for soil elastic limit $$q_{(i)}$$ q ( i ) , soil resistance $$R_{U} (i)$$ R U ( i ) and other parameters in the pile-soil model of high-strain dynamic test method are clarified. The test and analysis results indicate that under the condition that the ground temperature of frozen soil is about − 1.9 °C, the pile-soil refreezing takes about 120 days, and the pile-soil refreezing is a slow process; In CAPWAPC calculation program, after the values of soil parameters were constrained by the results of static-load test, the calculated curve is in satisfactory agreement with the measured curve, and the parameters of the pile-soil model are reliable, which can be used for the rapid detection of the ultimate bearing capacity of piles in permafrost regions; In the process of pile-soil refreezing, the change of temperature field affects the freezing strength between pile and soil, the process of pile-soil refreezing is positively correlated with the increase of pile foundation bearing capacity.

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A novel creep-damage constitutive model of clay–gravel composite considering the effect of water content and saturation-undersaturation cycles and its engineering application

Zhang,

Chen,

Zhang

et al. 2024

Bull Eng Geol Environ

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A thermodynamically consistent framework for visco-elasto-plastic creep and anisotropic damage in saturated frozen soils

Cited by 10 publications

References 34 publications

Modelling the time‐dependent mechanical behaviour of clay rocks based on meso‐ and micro‐structural viscous properties

Modelling the time‐dependent mechanical behaviour of clay rocks based on meso‐ and micro‐structural viscous properties

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

A novel creep-damage constitutive model of clay–gravel composite considering the effect of water content and saturation-undersaturation cycles and its engineering application

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