Analysis of temperature controlled ventilated embankment

Yu, Qihao; Shi, Conghui; Niu, Fujun; He, Ning; Roth, Kurt

doi:10.1016/j.coldregions.2004.11.004

Cited by 24 publications

(4 citation statements)

References 4 publications

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“…Heat pipe technology has also been successfully applied to the TPAS and CRCOP in the prevention of freeze damage. The temperature-controlled ventilation pipe can quickly decrease the temperature in the embankment and roadbed and increase the stability of the permafrost soil below and hence of the engineering structure itself, so it played a good role in the prevention of freezing and thawing disasters on the Qinghai-Tibet Railway [128][129][130][131][132]. Although the temperature-controlled ventilation pipe has not been applied in pipeline engineering, researchers have found through numerical simulation that it also has a beneficial effect on slowing down the melting pipeline foundation soil [21] (5) comprehensive measures.…”

Section: Mitigative Measuresmentioning

confidence: 99%

Stability of the Foundation of Buried Energy Pipeline in Permafrost Region

Jin

Wen

et al. 2021

Geofluids

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During operation, a buried pipeline is threatened by a variety of geological hazards, particularly in permafrost regions, where freezing-thawing disasters have a significant influence on the integrity and safety of the buried pipelines. The topographical environmental conditions along the pipeline, as well as the influence of frost heave and thaw settlement on the pipeline’s foundation soil, must be considered in the design and construction stage. Theoretical analysis, numerical modeling, field testing, and mitigation measures on vital energy pipelines in permafrost have been widely documented, but no attempt has been made to review the freezing-thawing disasters, current research methodologies, and mitigation strategies. This article reviews the formation mechanisms and mitigation measures for frost hazards (e.g., differential frost heave, thaw settlement, slope instability, frost mounds, icing, river ice scouring, and pipeline floating) along buried pipelines in permafrost regions and summarizes and prospects the major progress in the research on mechanisms, analysis methods, model test, and field monitoring based on publications of studies of key energy pipelines in permafrost regions. This review will provide scholars with a basic understanding of the challenging freezing-thawing hazards encountered by energy pipelines in permafrost regions, as well as research on the stability and mitigation of pipeline foundation soils plagued by freezing-thawing hazards in permafrost regions under a warming climate and degrading permafrost environment.

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Section: Mitigative Measuresmentioning

confidence: 99%

Stability of the Foundation of Buried Energy Pipeline in Permafrost Region

Jin

Wen

et al. 2021

Geofluids

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“…To minimize or eliminate the influences of these factors, a geotextile has been laid on highways in permafrost regions in Alaska, USA to enhance the mechanical stability of the roadbed (Savage, 1991). Meanwhile, related measures, such as the application of duct-ventilated embankment, crushed-rock revetment, sunshields, and heat pipes, have been used to maintain roadbed stability by adjusting the temperature fields of embankment slopes, embankments, or roadbeds (Niu et al, 2003;Sun et al, 2006;Yu et al, 2005Yu et al, , 2007aHayley et al, 1983;Lepage et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Analysis of asymmetric temperature fields for the duct-ventilated embankment of highway in permafrost regions

Qian

et al. 2016

Cold Regions Science and Technology

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The heat capacity and polythermal effect of highway roadbeds with wide asphalt pavements have become increasingly significant, which causes their influences on engineering and permafrost issues to become prominent. A duct-ventilated embankment is a potential mean to proactively cool ground temperatures. This method is applied experimentally in a highway for the first time. According to a field testing in the Tibetan Plateau Highway Pilot Project, a duct-ventilated embankment has excellent cooling effect. The mean annual ground temperature reduction at the embankment/natural ground surface interface is 1.62 C. The mean annual temperature difference between the south-and north-facing slopes reaches 2.39 C. This difference results in the asymmetry of the underlying temperature field and longitudinal roadbed cracking. The asymmetric distribution of the duct-ventilated embankment temperature field is caused by differential sun exposure and the heat transfer process and intensity within the duct. Differential sun exposure is a major factor between the south-and north-facing sides, accounting for 84%, whereas the remaining 16% is ascribed to the different heat transfer processes within the duct. The amount of asymmetry is increased to 20% by the duct and slightly accentuated by the ventilation duct. To avoid this effect, future projects should focus on solving problems related to roadbed direction and the effect of slope temperature difference on ground temperature. Measures are recommended to be taken to regulate both slope temperature adjustment

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“…Several laboratory and field studies have shown that some sort of ventilation of the embankment can reduce the warming of the ground (Goering and Kumar, 1996;Wu et al, 2002;Lai et al, 2004a;Lai et al, 2004b;Cheng, 2005;Liu and Lai, 2005;Yu et al, 2005;Ma et al, 2006). The insulating effect of the embankment ventilation with air is a result of a combination of the low air thermal conductivity and convective air fluxes.…”

Section: Introductionmentioning

confidence: 99%

The use of a convective heat flow model in road designs for Northern regions

Arenson

Sego

Newman

2006

2006 IEEE EIC Climate Change Conference

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Roads and highways in northern environments are exposed to harsh climatic conditions. In particular, changes in temperature of several tens of degrees centigrade between the seasons, and substantial precipitation as well as permafrost conditions are common. These environmental conditions result in significant damages to the infrastructure that requires extensive maintenance. Road damage is directly related to problems associated with the foundation, frequently resulting in differential settlements. Significant increase in these problems is expected as a result of changing climate, thus reducing the expected service life of various roads in arctic regions. The highway system within the permafrost region is extremely vulnerable to these climate changes because the mechanical property of the soil changes dramatically with temperature increases and as ice within the frozen soil thaws. This paper presents a numerical investigation of a novel approach for an improvement of road foundations resulting from convective heat flow. The proposed foundation is capable of compensating for some of the expected warming of the permafrost by storing and maintaining the cold winter temperatures through the summer months. The numerical model demonstrated the importance of considering convective heat flows to optimize the design of the foundation with a focus on minimizing the effect of climate warming.

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Analysis of temperature controlled ventilated embankment

Cited by 24 publications

References 4 publications

Stability of the Foundation of Buried Energy Pipeline in Permafrost Region

Stability of the Foundation of Buried Energy Pipeline in Permafrost Region

Analysis of asymmetric temperature fields for the duct-ventilated embankment of highway in permafrost regions

The use of a convective heat flow model in road designs for Northern regions

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