Numerical analysis for critical thickness of crushed rock revetment layer on Qinghai–Tibet Railway

Sun, Bo; Yang, Lijun; Liu, Qi; Wang, Wei; Xu, Xuezu

doi:10.1016/j.coldregions.2009.02.005

Cited by 20 publications

(11 citation statements)

References 29 publications

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“…Finally, to prevent thawing of the underlying foundation soils during construction, ACE should be built during winter by placing the aggregate material in a frozen state (Goering, 2001). In order for adaptation methods based on natural convection to be effective, a temperature differential resulting in air density instability is required to initiate air movement and thus convective heat transfer within the ACE (Goering and Kumar, 1996;Sun et al, 2005;Sun et al, 2009). This activation temperature differential needs to be considered in relation to the site's predicted climate warming and design life.…”

Section: Heat Extraction Methodsmentioning

confidence: 99%

Adaptation Methods for Transportation Infrastructure Built on Degrading Permafrost

Doré

Niu

Brooks

2016

Permafrost & Periglacial

141

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Climate warming since the second half of the 20th century has begun to significantly impact infrastructure integrity in permafrost environments and has already resulted in expensive maintenance operations. Engineers in countries with permafrost are actively working to adapt the design of structures to degrading permafrost conditions. Here, we review permafrost degradation processes and their geotechnical impacts. We also summarise mitigation techniques for protecting transportation infrastructure built on permafrost and for preventing permafrost degradation near these facilities based on the results of field and laboratory tests, numerical simulations and engineering practices on such infrastructure. We draw four conclusions: (1) climate warming and local surface changes have caused permafrost degradation, and resulted in instability and damage leading to infrastructure maintenance and repair; (2) passive cooling methods, including high‐albedo surfacing, sun‐sheds, air convection embankments, air ducts, heat drains and thermosyphons, have shown consistent cooling effects, if designed appropriately; (3) mitigation and adaptation methods are more expensive than conventional construction techniques as shown by construction cost data for a test site in Canada; and (4) the influence of continued climate warming on permafrost and infrastructure design must be considered within the design of new or rehabilitated infrastructure and within the context of the infrastructure's service life. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Heat Extraction Methodsmentioning

confidence: 99%

Adaptation Methods for Transportation Infrastructure Built on Degrading Permafrost

Doré

Niu

Brooks

2016

Permafrost & Periglacial

141

View full text Add to dashboard Cite

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“…(2) and 3, respectively, and the effect of the temperature intervals of phase change has been considered. The equations can be expressed [17,18]:…”

Section: The Governing Differential Equationsmentioning

confidence: 99%

Numerical simulation of the temperature fields in the shielding walls of frozen soil with multi-circle-pipe freezing in shaft sinking

Yang

Liao²,

Cai

et al. 2019

Therm sci

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In this study, the temperature fields of frozen soil wall were calculated by using numerical method, and were analyzed after the soil was actively frozen with different freezing time. The results showed that the temperature field evolved from the freezing pipes, and then formed into frozen soil cylinders. After a certain freezing duration, the cylinders of frozen soil began to connect, and frozen soil walls started to form. At initial freezing stage, the thickness of frozen soil wall was mainly determined by the freezing pipes of the inner two circles. Then, connections were found to have occurred between the inner and outer frozen soil walls. Finally, the temperature fields of the unfrozen and frozen soils reached a state of stability. The results also showed that it was feasible to use numerical method to simulate the temperature fields of frozen soil walls during shaft sinking process, and potentially provided important references for the design and construction of deep alluvium shaft.

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“…The construction of the Qinghai-Tibet Express Highway was proposed after the Qinghai-Tibet Railway has been constructed and been officially operational on July 1st, 2007 [1]. However, the successful construction of the proposed Express Highway has still many problems, such as location of the express highway, width and height of embankment, and applicability of various adjusting techniques of cooling ground temperature, etc [2][3][4][5][6][7][8][9][10]. The factors affecting the express highway embankment stability in cold regions mainly include the climatic, geological, geographical and engineering ones, etc [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Crushed Rock Layer Width on Natural Convection Cooling of Highway Embankment in Permafrost Regions

Yang

Sun

Wang

et al. 2012

AMM

Self Cite

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For the construction of the proposed Qinghai-Tibet Express Highway in permafrost regions, it will be necessary to use the new technique of cooling the ground temperature by the coarsely crushed rock layer with a low fines content. The heat convection governing equations based on airflow function in variable permeability porous crushed rock layer are derived. Comparison of the cooling capability of winter-time natural convection in the crushed rock highway embankments with various widths of crushed rock layer and an air-permeable side slope surface were studied using a finite element method. The result indicates that the cooling capability of natural convection within the crushed rock highway embankment with a crushed rock layer width of 12 m is stronger than that with a crushed rock layer width of 10 m. Under the same temperature and pressure boundaries, the storage of cold energy in the foundation soils below the wider crushed rock highway embankment due to natural convective heat transfer is larger than that below the narrower one.

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Numerical analysis for critical thickness of crushed rock revetment layer on Qinghai–Tibet Railway

Cited by 20 publications

References 29 publications

Adaptation Methods for Transportation Infrastructure Built on Degrading Permafrost

Adaptation Methods for Transportation Infrastructure Built on Degrading Permafrost

Numerical simulation of the temperature fields in the shielding walls of frozen soil with multi-circle-pipe freezing in shaft sinking

Effect of Crushed Rock Layer Width on Natural Convection Cooling of Highway Embankment in Permafrost Regions

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