Influence of Cyclic Freezing-Thawing on the Strength and Deformability of Frozen Soils: A State-of-the-Art Review

Boldyrev, G. G.; Idrisov, I. H.

doi:10.25296/1993-5056-2017-3-6-17

Cited by 1 publication

(2 citation statements)

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“…Soils undergo various transformations under the influence of processes associated with freezing and thawing water phase transitions, resulting in changes in their properties [1][2][3][4][5][6]. The combination of these processes is referred to as cryogenesis [7].…”

Section: Introductionmentioning

confidence: 99%

“…To date, the main regularities of such changes have been established for most soil types having rigid structural bonds of crystallisation or cementation type (such soils defined as rocky according to the classification system adopted in the Russian Federation are characterised by a uniaxial compression strength of at least 5 MPa [8]) under laboratory conditions. As a rule, these studies are based on determining the physical and strength characteristics of soil samples after repeated cycles of freezing and thawing [1,[9][10][11][12][13][14][15][16][17]. Very little work has been carried out to describe the mechanisms (physico-chemical, mineralogical, structural, including the nature of water migration and ice formation) and material transformations that occur during phase transitions of water, i.e., freezing and thawing.…”

Section: Introductionmentioning

confidence: 99%

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Carbonate Soil Cryogenesis in South Yakutia (Russia)

et al. 2021

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The present study investigates changes occurring in the material composition and properties of the South Yakutian carbonate soils during cryogenesis. The nature of the transformations of certain limestone varieties composing the surfaces of rock massifs was determined using scanning electron microscopy, 3D X-ray tomography, as well as lithological–mineralogical and optical–petrographic studies, over a 10-year period. The areas in carbonate rock massifs with increased clay content, pyritisation, dolomitisation, and baritisation, as well as zones of calcite and dolomite junction, were found to be least resistant to the effects of processes associated with water phase transitions, i.e., freezing and thawing. The mineral proportion of limestone on the surface of soil massifs chemically processed over a 10-year period reached 5–7% of the volume of the weathered rocks. In the process of transformation, not only the composition of the rocks changed, but also the nature of the structural bonds that significantly influence their mechanical strength properties. The number of cracks for weathered soil samples increased by 9–16%; their opening increased by 13–18%. For rocks initially having uniaxial compression strength in the range of 33–46 MPa, this strength was reduced by 19–27%. Laboratory experiments on 1000-fold cyclic freezing and thawing of carbonate rock samples (which corresponds to an 8–10-year period of weathering on the surface of a mountain outcrop under the natural conditions of South Yakutia) demonstrate the similarity of these changes with those observed in samples taken from the sides of open pits 10 years ago. In general, soils are influenced by a wide range of environmental factors under natural conditions. The significant influence of alternating temperatures on the changes in the composition and structure of limestones in South Yakutia is characterised in detail.

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