Influence of Thawing Conditions and Type of Testing on Deformation Characteristics of Thawing Soil

Kotov, P. I.; Roman, L. T.; Sakharov, I. I.; Paramonov, V. N.; Paramonov, Maxim

doi:10.1007/s11204-015-9337-5

Cited by 15 publications

(7 citation statements)

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“…Based on the elastic wave and axial deformation measurement results, the DT20-C100 specimen, which is thawed in the DT condition and restored to the initial stress conditions during the consolidation phase, exhibited less sample disturbance compared to the initial unfrozen specimens. Multidirectional thawing under compressive conditions may cause higher volume changes owing to the concentration and uneven stress distribution [ 8 ]. The results also suggest that a minimum confining stress is necessary to help the specimen stand-alone during thawing, and the remaining stress should be restored during the consolidation phase.…”

Section: Discussionmentioning

confidence: 99%

“…However, unidirectional thawing cannot be entirely maintained in the laboratory owing to the inevitable radial direction thawing [ 2 ]. Researchers proposed that multidirectional thawing causes greater deformation under compressive conditions owing to the frozen kernel behaving as a stress concentrator [ 8 ]; in cases where higher effective stress is applied to the multidirectional thawing specimens, a greater sample disturbance is expected. Therefore, more practical suggestions and evaluations of the thawing and stress restoration methods of frozen specimens for laboratory tests are required.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Thawing and Stress Restoration Method for Artificial Frozen Sandy Soils Using Sensors

Kim

Lee

Arnold

et al. 2021

Sensors

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Undisturbed frozen samples can be efficiently obtained using the artificial ground freezing method. Thereafter, the restoration of in situ conditions, such as stress and density after thawing, is critical for laboratory testing. This study aims to experimentally explore the effects of thawing and the in situ stress restoration process on the geomechanical properties of sandy soils. Specimens were prepared at a relative density of 60% and frozen at −20 °C under the vertical stress of 100 kPa. After freezing, the specimens placed in the triaxial cell underwent thawing and consolidation phases with various drainage and confining stress conditions, followed by the shear phase. The elastic wave signals and axial deformation were measured during the entire protocol; the shear strength was evaluated from the triaxial compression test. Monotonic and cyclic simple shear tests were conducted to determine the packing density effect on liquefaction resistance. The results show that axial deformation, stiffness, and strength are minimized for a specimen undergoing drained thawing, restoring the initial stress during the consolidation phase, and that denser specimens are less susceptible to liquefaction. Results highlight that the thawing and stress restoration process should be considered to prevent the overestimation of stiffness, strength, and liquefaction resistance of sandy soils.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Thawing and Stress Restoration Method for Artificial Frozen Sandy Soils Using Sensors

Kim

Lee

Arnold

et al. 2021

Sensors

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“…In all these cases with the freezing or subsequent thawing of soil the through cracks were formed in the frameworks of buildings (walls or columns), and the sheet pile walls were deformed with the break of anchors. In the case of occurrence of permafrost soils in the base of foundations their thawing in the process of operation led to the settlements amounts to tens of centimeters which made further functioning of objects impossible [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Forecast the Processes of Thawing of Permafrost Soils under the Building with the Large Heat Emission

2016

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Abstract. The paper describes a mathematical model of the soil experiencing freezing and thawing. The mathematical model is realized by the authors with the use of finite element method in the program «Termoground». The results of calculation the processes of the thawing of permafrost soil under the building with the large heat emission with various constructive measures for the conservation of frozen soil structure are given. Taking into account high costs of such measures it is recommended a combination of I and II principles of the design of foundations allowing partial thawing of soil, which requires the ability to predict the deformation of thawing soil.

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“…Методика исследования. Исследования выполняли на двух типах приборов [Kotov, 2015]. Прибор, обеспечивающий плоскопараллельное оттаивание, включал изоляцию боковой поверхности и нижнего торца нетеплопроводным материалом капролоном.…”

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“…Отличия обусловлены неравномерностью распределения напряжения в грунте в процессе оттаивания. Так, при всестороннем оттаивании грунта мерзлое ядро представляет собой концентратор напряжения, так как напряжение вокруг ядра превышает напряжение у стенок в 3 раза (по данным расчета в программе Termoground), что приводит к большему уплотнению образца в центре [Kotov, 2015]. Оттаивание в песке происходит быстрее, чем в глинистых грунтах, поэтому влияние мерзлого ядра здесь слабее.…”

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I mpact of compaction and thaw conditionson deformation characteristics of thawing soils

Kotov¹,

Roman²,

Tsarapov³

2017

Vestnik Moskovskogo universiteta. Seriâ 4, Geologiâ

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The results of laboratory studies of the effect of thawing conditions (plane-parallel or three dimensional) on the deformation characteristics (thawing and compression coefficients) thaw- ing soils (sand, sandy loam, clay loam) with desired physical properties of massive and layered cryogenic textures presented in the article. It was found that the values of the thawing coefficient bigger after three dimensional thawing, and compression coefficient after plane- parallel thaw- ing. The obtained data allowed to establish the applicability of the experimental determination of thawing soils deformation characteristics regardless of thawing conditions.

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Influence of Thawing Conditions and Type of Testing on Deformation Characteristics of Thawing Soil

Cited by 15 publications

References 0 publications

Evaluation of Thawing and Stress Restoration Method for Artificial Frozen Sandy Soils Using Sensors

Evaluation of Thawing and Stress Restoration Method for Artificial Frozen Sandy Soils Using Sensors

Forecast the Processes of Thawing of Permafrost Soils under the Building with the Large Heat Emission

I mpact of compaction and thaw conditionson deformation characteristics of thawing soils

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