Heat transfer and water migration in loess slopes during freeze–thaw cycling in Northern Shaanxi, China

Xu, Jian; Wang, Songhe; Wang, Zhangquan; Jin, Long; Yuan, Jian

doi:10.1007/s40999-018-0298-8

Cited by 15 publications

(9 citation statements)

References 33 publications

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“…Soil specimens with a moisture content of 9.0% were taken as an example. e strength at a normal stress of 200 kPa increased by 40.4% as the dry density increased from 1.9 g/cm 3 to 2.15 g/cm 3 . It was due to the compact initial structure of the soil specimen at large dry density.…”

Section: Effect Of Dry Density On the Shear Strengthmentioning

confidence: 96%

“…Figure 8 shows that the shear strength of freeze-thaw interface decreased with the increase in moisture content. e shear strength of interface at a dry density of 1.9 g/cm 3 and a normal stress of 200 kPa decreased by 19.7% with the increase in moisture content (from 9.0% to 14.0%). e reason was that the soil specimens near the optimum moisture content were easily compacted and had high shear strength, although the situation was the opposite when soil tended to be saturated.…”

Section: Effect Of Dry Density On the Shear Strengthmentioning

confidence: 97%

“…During the formation and shearing of the freeze-thaw interface, water migration always occurs in the interface of CGS. at is, the pore water moves to the freezing front when the soil sample freezes [3]. e final result is the variation of moisture content in different positions of soil specimens.…”

Section: Features Of Water Migration Of Freeze-aw Interface In Cgsmentioning

confidence: 99%

“…In cold regions, either freezing or thawing process, water migration always occurs near the freeze-thaw interface of soils [1,2]. It would result in the increase in the moisture content of interface and further reduces the effective stress of soil [3,4]. As a result, the freeze-thaw interface of soil is a weak plane of slopes owing to the reduction of the soil strength, which is easy to induce slope failure and other geological hazards [5,6].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Shear Properties and Mechanism of Freeze‐Thaw Interface in Unsaturated Coarse‐Grained Soil from Qinghai‐Tibet Plateau

Niu

et al. 2021

Advances in Civil Engineering

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Freeze-thaw interface in unsaturated coarse-grained soil (CGS) is a weak plane which can cause slope failures in cold regions. This study presents a series of large-scale direct shear tests on freeze-thaw interface in CGS through a temperature control system. The tested soil was taken from a high slope in the Qinghai-Tibet Plateau. It was remolded with three dry densities (1.9, 2.0, and 2.15 g/cm3) and three moisture contents (9.0%, 11.5%, and 14.0%). With testing results, direct shear curves mainly performed as hardening deformation, and they were affected considerably by specimen conditions. The shear strength increased with both the increasing dry density and normal stress, but it was opposite with moisture content changed. The cohesion and internal friction angle increased with the increase in dry density but decreased with the moisture content. The particle movement and water migration of freeze-thaw interface in CGS during the test were significant, and they had close relations with the shear properties of specimens. And, an empirical model was produced to express the effect of pore ice on the shear strength of interface during the shear test. The tests and analysis in this study may provide useful references for CGS slope stability analysis in high cold regions.

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Section: Effect Of Dry Density On the Shear Strengthmentioning

confidence: 96%

Section: Effect Of Dry Density On the Shear Strengthmentioning

confidence: 97%

Section: Features Of Water Migration Of Freeze-aw Interface In Cgsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shear Properties and Mechanism of Freeze‐Thaw Interface in Unsaturated Coarse‐Grained Soil from Qinghai‐Tibet Plateau

Niu

et al. 2021

Advances in Civil Engineering

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“…For instance, the phase change of unfrozen water to ice increases heat transport (thermal conductivities of ice and water are 2.2 and 0.6 W m −1 K −1 , respectively) [17,18], reduces hydraulic conductivity and permeability because ice impedes water flow [19], and increases soil strength [20]. Soil freeze-thaw dynamics result in a phase change between unfrozen water and ice [13,21], hydrothermal migration [22,23], release of greenhouse gas(es) [24], and salt accumulation [25,26] that alter energy and mass exchange at the soil-atmosphere interface. Frozen soil, therefore, impacts agricultural, engineering, and environmental practices and socio-economic development in cold regions [12,14,[27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

A Scientometric Review of Research Status on Unfrozen Soil Water

Feng

Zhang

et al. 2021

Water

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Unfrozen soil water affects the physical, chemical, hydrological, and mechanical properties of frozen soils, and climate change makes these relationships more complicated. The objective of this study was to investigate the research status of unfrozen soil water using scientometrics. Publications on unfrozen water in frozen soil (UWFS) retrieved from the Web of Science were analyzed with scientometric software tools including VOSviewer, CiteSpace, and HistCite Pro. The annual publication trend, co-authorship of authors, organizations, and countries, and the co-occurrence of keywords were analyzed. The most utilized journals and high-impact publications were identified. The results showed that 2007 (the year the “Bali Road Map” was released) represents a turning point (from slow to rapid) in the development of research on unfrozen water in frozen soil. Researchers and organizations from China and the United States are the major contributors, while Cold Regions Science and Technology is the most utilized journal for publishing research pertaining to UWFS. Currently, there is still a lack of reliable and user-friendly methods and techniques for measuring unfrozen water content. Future efforts are required to understand the mechanisms governing the magnitude of unfrozen water content and to develop new approaches to accurately and rapidly measure unfrozen water content in both laboratory and in situ.

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Study on thermal‐hydro‐mechanical coupling and stability evolution of loess slope during freeze–thaw process

Qin,

Li,

Yang

et al. 2024

Earth Surf Processes Landf

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Disasters occurring at loess slopes in seasonal frozen regions are closely related to changes in the thermo‐hydro‐mechanical (THM) state in loess by freeze–thaw (FT) action. Current research on FT‐induced soil slope failure focuses on frozen stagnant water effects, while the intrinsic connection between the FT‐induced stagnant water effect and soil strength deterioration remains unclear. In this study, by taking the FT‐induced loess slope failure as an example, field surveys, boreholes, exploratory wells, and 3D topographic mapping were used to reveal the landslide features and stratigraphic information; Furthermore, the temporal and spatial variation of water and heat in loess slope was revealed by on‐site monitoring data; A THM coupled model of frozen soil was established using COMSOL Multiphysics simulation software to reconstruct the frozen stagnant water process of shallow loess slope, as well as the influence of THM field on loess landslide. The results show that the effects of FT in the seasonally frozen region occurred in the shallow layer of the loess slope. The water‐ice phase transition during FT process broke the phase equilibrium of loess. Numerical calculations and field monitoring indicated a continuous migration of water to the freezing front, creating a water‐enriched zone inside the loess. Both the impact of the frozen stagnant water and changes in the stress field led to the degradation of loess structure and reduced the strength properties, thus threatening the stability of the loess slope. The study results can contribute to an in‐depth understanding of the mechanism underlying FT loess landslides in seasonal frozen regions, and provide a scientific basis for the evaluation and prevention of FT landslides.

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Heat transfer and water migration in loess slopes during freeze–thaw cycling in Northern Shaanxi, China

Cited by 15 publications

References 33 publications

Shear Properties and Mechanism of Freeze‐Thaw Interface in Unsaturated Coarse‐Grained Soil from Qinghai‐Tibet Plateau

Shear Properties and Mechanism of Freeze‐Thaw Interface in Unsaturated Coarse‐Grained Soil from Qinghai‐Tibet Plateau

A Scientometric Review of Research Status on Unfrozen Soil Water

Study on thermal‐hydro‐mechanical coupling and stability evolution of loess slope during freeze–thaw process

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