Study on thaw consolidation of permafrost under roadway embankment

Qi, Jilin; Yao, Xiang; Yu, Fan; Liu, Yongzhi

doi:10.1016/j.coldregions.2012.04.007

Cited by 60 publications

(27 citation statements)

References 17 publications

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“…In addition, during the cold seasons, "residual consolidation" induced by water migrating to freezing front and occurring in the post-thawed permafrost layer is another source of embankment settlement . According to the previous studies Qi et al, 2007Qi et al, , 2012Wang et al, 2013;Yu et al, 2013), the settlements in different seasons of a year are due to different thermal mechanical processes occurring in different seasons and the settlement caused by thaw consolidation of permafrost is only a part of the total settlement. This is why the calculated thaw settlement result is smaller than the monitored data for section No.…”

Section: Seasonal Thaw Settlement Of Permafrost Embankmentmentioning

confidence: 98%

“…Furthermore, during the warm seasons when permafrost embankments stay in a post-thawed state each year, thaw settlement usually occurs only between August and November Yu et al, 2002). The method proposed by Qi et al (2012) cannot simulate it reasonably. A more efficient method needs to be employed to examine the thaw consolidation behaviours of permafrost embankment more comprehensively.…”

Section: Introductionmentioning

confidence: 93%

“…For the permeability of underlying layers, a uniform value was assigned (Tables 2a and 2b). As pointed out by Qi et al (2012) when a sample begins thawing, the drainage ability of the soil sample depends on the permeability of the top layer as it post-thaws downwards. For the permafrost embankment engineering cases in this analysis, the drainage rate of underlying layers is also controlled by the permeability of top natural ground layer (i.e., the silty clay layer for both cases (Fig.…”

Section: Description Of Working Sites and Instrumentationmentioning

confidence: 98%

“…This is obviously unreasonable. To avoid this problem, Qi et al (2012) proposed a concept of effective consolidation time to simplify the numerical implementation as if it is a constant thermal problem. However, in this way thermal and consolidation processes were calculated separately, which could not reflect thermal and consolidation interactions.…”

Section: Numerical Implementation Strategymentioning

confidence: 99%

“…To improve the understanding of this problem, an equivalent simulation method based on large strain thaw consolidation theory was proposed by Qi et al (2012) and the general development of embankment thaw settlement was studied. It was shown that high ice content and thawing rate may not lead to a large settlement immediately due to the continuous decrease in thaw consolidation degree caused by an increase in the drainage path and decrease of effective consolidation time.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thaw consolidation behaviours of embankments in permafrost regions with periodical temperature boundaries

Wang

Yu³

2015

Cold Regions Science and Technology

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Section: Seasonal Thaw Settlement Of Permafrost Embankmentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 93%

Section: Description Of Working Sites and Instrumentationmentioning

confidence: 98%

Section: Numerical Implementation Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thaw consolidation behaviours of embankments in permafrost regions with periodical temperature boundaries

Wang

Yu³

2015

Cold Regions Science and Technology

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Analytical solution for one‐dimensional thaw consolidation model with double moving boundaries

Han,

Zhou,

Zhao

et al. 2024

Num Anal Meth Geomechanics

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A one‐dimensional thaw consolidation model considering the density change from pore ice to pore water is established, and the model describes a special type of moving boundary problem with double moving boundaries. An analytical solution for the model under a time‐varying external load is developed using certain form of superposition principle and the similarity type of general solution. Some known solutions in literature can be recovered as special cases of the analytical solution once the density change from pore ice to pore water is neglected. If the thawing front was to cease at certain time, consolidation of thawed soil in a fixed region is then encountered, and an analytical solution for the post‐thawing consolidation problem is developed using the Green's function method. Computational examples of the analytical solutions are presented. First, comparison between our model and classical model of Morgenstern and Nixon (MN model) is conducted, showing the error caused by neglecting the density change from pore ice to pore water. The MN model overestimates the excessive pore water pressure at locations near the soil surface, while underestimates it at locations near the thawing front; the error caused by neglecting the density change becomes more pronounced with increasing ice content of frozen soil. Second, comparison between the thaw consolidation process under an instant load and that under a corresponding exponential load is made. The difference in thaw consolidation behavior between the two situations mainly displays during the early stage, when there is obvious discrepancy between the two external loads; the degree of consolidation and thaw consolidation settlement are more sensitive to the discrepancy in external load than the excessive pore water pressure is.

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Ground temperature and deformation analysis for an expressway embankment in warm permafrost regions of the Tibet plateau

Liu

Tai

Fang

2019

Permafrost & Periglacial

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The physical and mechanical processes relating to infrastructure are strongly intertwined in subgrades of road or railway in warm permafrost regions, where the evolution of these processes may influence the functionality of infrastructure. Thus, this study analyzed the embankment thermal regime and thaw settlement behavior based on monitored data for three sections of the newly constructed Gonghe–Yushu expressway (GYE) in a warm permafrost area of Tibet. The efficiencies of crushed rock, ventilated, and insulated embankments in maintaining permafrost temperature were evaluated in relation to the permafrost table (PT) and the annual warming rate of the permafrost. The deformation characteristics of three embankments for different soil layers are summarized, along with analysis of heat balance. The results show that: (a) the permafrost thaw rate has a positive linear correlation with mean annual ground temperature; (b) the permafrost displays a warming trend regardless of whether PT increases or decreases; (c) the total deformation of a given embankment shows a tendency toward settlement; and (d) subgrade peak thaw settlement occurs later than its maximum seasonal thaw depth.

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Study on thaw consolidation of permafrost under roadway embankment

Cited by 60 publications

References 17 publications

Thaw consolidation behaviours of embankments in permafrost regions with periodical temperature boundaries

Thaw consolidation behaviours of embankments in permafrost regions with periodical temperature boundaries

Analytical solution for one‐dimensional thaw consolidation model with double moving boundaries

Ground temperature and deformation analysis for an expressway embankment in warm permafrost regions of the Tibet plateau

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