Influence of bimodal structure on the soil freezing characteristic curve in expansive soils

Kong, Lingming; Yu, Aolin; Liang, Ke; Qi, Jilin

doi:10.1016/j.coldregions.2021.103437

Cited by 17 publications

(5 citation statements)

References 31 publications

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“…The soil type (SLS or SS) defines the residual water content -the liquid water left that does not freeze (or freezes extremely slowly) -as temperature continues to decrease (Jin et al, 2020). For example, studies of clays have found substantial liquid water fractions on the order of 20 m 3 /m 3 at temperatures as low as -25 • C (Bittelli et al, 2004b;Kong et al, 2022).…”

Section: Constructing An Sfccmentioning

confidence: 99%

A Repository of 100+ Years of Measured Soil Freezing Characteristic Curves

Devoie

Gruber

McKenzie

2022

Preprint

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Abstract. Soil freeze-thaw processes play a fundamental role in the hydrology, geomorphology, ecology, thermodynamics and soil chemistry of a cold-regions landscape. In understanding these processes, the temperature of the soil is used as a proxy to represent the soil ice content through a soil freezing characteristic curve (SFCC). This mathematical construct relates the soil ice content to a specific temperature for a particular soil. SFCCs depend on many factors including soil properties (e.g., porosity, composition, etc.), soil pore water pressure, dissolved salts, (hysteresis in) freezing/thawing point depression, and degree of saturation, all of which can be site-specific and time varying. SFCCs have been measured using various methods for diverse soils since 1921, and to date this data has not been broadly compared, in part because it has not previously been compiled in a single data set. The dataset presented in this publication includes SFCC data digitized or received from authors, and includes both historic and modern studies. The data is stored in an open-source repository, and an R package is available to facilitate its use. Aggregating the data has pointed out some data gaps, namely that there are few studies of coarse soils, and comparably few in-situ measurements of SFCCs in mountainous environments. It is hoped that this dataset will aid in the development of SFCC theory, and improve SFCC approximations in soil freeze-thaw modelling activities.

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Section: Constructing An Sfccmentioning

confidence: 99%

A Repository of 100+ Years of Measured Soil Freezing Characteristic Curves

Devoie

Gruber

McKenzie

2022

Preprint

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“…Weakly consolidated rocks, such as mudstone, claystone, and expansive softrock, in water-rich regions, are susceptible to structural degradation due to F-T cycles in seasonally frozen environments. Extensive experimental studies, which include unconfined compressive tests [13], triaxial shear tests [14], Brazilian tensile tests [15], point loading tests [16], and split Hopkinson pressure bar tests [17] on weakly consolidated rocks, have consistently demonstrated a noteworthy decline in its mechanical properties with an increasing number of F-T cycles. Hong et al (2021) proposed a predictive model for uniaxial compressive strength of expansive soft rock that integrates F-T cycles, based on the elastic-plastic theory, and fatigue damage mechanics [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Freeze–Thaw Cycles on Microstructure and Hydraulic Characteristics of Claystone: A Case Study of Slope Stability from Open-Pit Mines in Wet Regions

Liu,

Xiang,

Liu

et al. 2024

Water

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The action of freeze–thaw (F–T) cycles of claystone exerts a profound impact on the slope stability of open-pit mines in water-rich regions. Microstructural changes are observed as a crucial factor in determining the hydraulic characteristics and mechanical behaviors of claystone. The present work integrates a micro-X-ray computed tomography (Micro-CT) scanner, equipped with image processing and three-dimensional (3D) reconstruction capabilities, employed to observe the microstructure of claystone under varying numbers of F–T cycles (0, 10, 20, 30, and 50). Furthermore, seepage numerical simulations based on Micro-CT measurements are conducted to evaluate the hydraulic characteristics. Through meticulous microscopic observation and mechanical analysis, the damage mechanism induced by F–T cycles is revealed and the evolutionary characteristics are analyzed. The two-dimensional (2D) images of 3D reconstructed models unveil the gradual initiation propagation and coalescence of an intricate fissuring network in claystone during the F–T cycles. As the number of F–T cycles increases from 0 to 50, the 3D porosity exhibits exponential growth. Additionally, the influence of F–T cycles substantially enhances the connectivity of fissures. The seepage numerical simulations demonstrate that the evolutionary progression of fissures substantially augments the number of flow paths and enhances permeability. The increase in permeability follows an exponential trend, reflecting the distribution and evolution of fissures under F–T cycles. The impact on permeability arises from a combination of micromechanical properties and the microstructure of claystones. The present research tries to elucidate the microscopic evolution of fissures and their corresponding hydraulic properties in water-saturated claystone, offering significant insights for investigating the slope stability of open-pit mines in regions.

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“…The empirical model treating the accumulation of strains under repeated cyclic loading is similar to the problem of creep under constant loading (Wang J.H., et al, 2018 andWang S.H., et al, 2014). Many investigators just considered the weakening effect but lost sight of the strengthening effect when they formulated the creep models, but it is necessary to consider (Hou F., et al, 2016 andKong L.M., et al, 2022). While, after thawing, the soil structural distribution of ice generally caused soil full of water, the creep property is generally denoted by the rheological principle model.…”

Section: Introductionmentioning

confidence: 99%

“…The condition of water content at 17.5% and the temperature at -1.3℃ brought the soil to freezing at the transverse path (Li X., Zheng S. F. , Wang M., 2023;Bing H., Ma W., 2011 andKozlowski T., 2009). The supercooling is the state with ultimate value of water content and temperature, then the stable-frozen stage gradually occurring (Kong L.M., et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, significant changes in temperature and moisture could made the creep curve changed from a decaying type to a non-decaying type (Li Q.L. et al, 2016;Li X., et al, 2023;Bing H., Ma W., 2011;Kozlowski T., 2009 andKong L.M., et al, 2022). So aiming to make the creep properties clear, the elementary rheological modeling such as Maxwell, Kelvin, and Bingham could effectively descript the characteristic with Hookean Spring, Newtonian Dashpot and Saint Vernant's Slider.…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation of the pile-soil interface characteristics in cold region under varying exposure temperature and accumulated permanent deformation under freezing-thawing cycles

Liu,

Niu

2023

Preprint

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The creep behavior of the frozen soil-structure interface as the research point in this paper subjected to mechanism theory principles of water-thermal coupling cycle was exhibited. There are mainly three situations, one is pile uplifting in the freezing heave period owing to frost heave force, then soil melt, and the pile would keep stable which the skin friction supported the pile at interface, three is both cases acting as stated above, the positive frozen cohesive is not enough to support the pile in frozen soil combined the negative friction at the same time. The frost heave with creep effect analysis was given the mainly concern. The emphasis of the frost heave phenomenon considering inner shear behavior under different geometric parameters in Freezing-Thawing cycle pointed that creep effect of the soil-pile interface played a domain role in the total deformation of interface due to common source of the settlement and uplift in cold regions. It reveals that the actual strain rate was sensitive at deeper soil layer by layer towards ground, according to the good agreement between the relaxation data and secondary creep conditions. The best fit regression was occurred in the period of approximate 65 th day to 200 th day accordingly. The strain mainly presents promoted when the temperature are below-2℃ in freezing transmission period, while it shows reduction trend with water content increase to ice-rich soil. It is taken for that with flow rate varying with stress conditions which exceed a yield stress level. And it shown the relationship of stress and strain at various depths with diminished lay-up character distribution. The numerical calculated result was shown that the high cohesion concentration zone be in the position of-2m depths of pile. And the mechanism model can be described by Kelvin-Voigt model, with validating by experimental simulation and published literature. Above all, it can be seen the temperature and moisture were the most significant effects for interface frost heave, which is indicated by the shear creep response analyzing. The combination of factors closely associated with the cohesion leading the pile continuously uplifting. The creep effect worked on the interface separated by three stage of primary creep stage, secondary creep stage and tertiary creep stage in frozen and thawing period by different cohesion force. So the characteristics of creep combined the Kelvin Voigt model was presented in this paper.

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Influence of bimodal structure on the soil freezing characteristic curve in expansive soils

Cited by 17 publications

References 31 publications

A Repository of 100+ Years of Measured Soil Freezing Characteristic Curves

A Repository of 100+ Years of Measured Soil Freezing Characteristic Curves

Effect of Freeze–Thaw Cycles on Microstructure and Hydraulic Characteristics of Claystone: A Case Study of Slope Stability from Open-Pit Mines in Wet Regions

An experimental investigation of the pile-soil interface characteristics in cold region under varying exposure temperature and accumulated permanent deformation under freezing-thawing cycles

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