A Preliminary Study on the Long-Term Structural Stability of Ventilation Ducts in Cold Regions

Xuejun Chen, Lei Wang, Zhikui Liu, Yinghong Qin

Abstract


The construction of roadways in permafrost regions modifies ground-surface conditions and consequently, negatively varies thermal stability of the underlying frozen soils. To avoid the thawing of the permafrost layer under the scenario of global warming, roadways are usually laid on a built-up embankment, which not only disperses the traffic loads to underlying layers but also minimize the thermal disturbance. In the embankment, duct ventilation, or called air duct, can be embedded to further cool the underlying permafrost. While the thermal performance of duct ventilations has been well documented, the long-term structural stability of duct ventilation remains unknown. This study examines the structural stress of ventilation ducts that are placed in harsh weather such as the Qinghai-Tibet Plateau. The ducts are currently buried in the embankment filler, with the wind-outlet and -inlet ends exposed and cantilevered out of the embankment. Field studies found that the exposed parts have plagued cracking and even failures, especially at the fixed end of the cantilevered part. Damages of these concrete ducts are attributed to cyclic freezing-thawing attack, thermally-induced stresses, moisture-induced stresses, and concrete swelling. These physical attacks are caused by the harsh weather in the Qinghai-Tibet plateau. It is recommended to insulate the exposed part of the ducts and to fabricate durable and dense concrete ducts.


Keywords


Concrete; Freezing-Thawing; Thermal Stress; Swelling and Shrinkage; Cracking.

References


Thomson, S. “A Brief Review of Foundation Construction in the Western Canadian Arctic.” Quarterly Journal of Engineering Geology and Hydrogeology 13, no. 2 (May 1980): 67–76. doi:10.1144/gsl.qjeg.1980.013.02.01.

Cheng, Guodong, Zhizhong Sun, and Fujun Niu. “Application of the Roadbed Cooling Approach in Qinghai–Tibet Railway Engineering.” Cold Regions Science and Technology 53, no. 3 (August 2008): 241–258. doi:10.1016/j.coldregions.2007.02.006.

J. Nixon, “Geothermal aspects of ventilated pad design, Proceedings 3rd International Conference of Permafrost”, National research Council of Canada, Ottawa, 1978, pp. 841-846.

J. Zarling, B. Connor, D. Goering, “Air duct systems for roadway stabilization over permafrost areas”. Final report, University of Alaska, Fairbanks, AK, 1984, pp. 1-55.

D.C. Esch, “Road embankment design alternatives over permafrost, Proceeding of the conference on applied techniques for cold environments”, ASCE, New York, 1978, pp. 159-170.

D.C. Esch, “Embankment case histories on permafrost, in: E.D. Johnson (Ed.), Embankment design and construction in cold regions”, ASCE/Technical council on cold regions engineering monograph, New York, 1988, pp. 125-159.

Zhang, Mingyi, Xiyin Zhang, Shuangyang Li, Daoyong Wu, Wansheng Pei, and Yuanming Lai. “Evaluating the Cooling Performance of Crushed-Rock Interlayer Embankments with Unperforated and Perforated Ventilation Ducts in Permafrost Regions.” Energy 93 (December 2015): 874–881. doi:10.1016/j.energy.2015.08.059.

YU, Qihao. “The Application of Auto-Temperature-Controlled Ventilation Embankment in Qinghai-Tibet Railway.” Science in China Series D 47, no. 13 (2004): 168. doi:10.1360/04zd0019.

Qian, Jin, Qi-hao Yu, Qing-bai Wu, Yan-hui You, and Lei Guo. “Analysis of Asymmetric Temperature Fields for the Duct-Ventilated Embankment of Highway in Permafrost Regions.” Cold Regions Science and Technology 132 (December 2016): 1–6. doi:10.1016/j.coldregions.2016.09.002.

Y. Qin, J. Zhang, “A review on the cooling effect of duct-ventilated embankments in China”, Cold Regions Science and Technology 95(0) (2013) 1-10. doi: 10.1016/j.coldregions.2013.07.005.

Q. Yu, F. Niu, X. Pan, Y. Bai, M. Zhang, “Investigation of embankment with temperature-controlled ventilation along the Qinghai–Tibet Railway”, Cold Regions Science and Technology 53(2) (2008) 193-199. doi: 10.1016/j.coldregions.2007.07.002.

F. Niu, G. Cheng, Q. Yu, “Ground-temperature controlling effects of ductventilated railway embankment in permafrost regions”, Science in China Series D: Earth Sciences 47(0) (2004) 152-160. doi:10.1360/04zd0017.

M. Zhang, Y. Lai, Y. Dong, S. Li, “Laboratory investigation on cooling effect of duct-ventilated embankment with a chimney in permafrost regions”, Cold Regions Science and Technology 54(2) (2008) 115-119. doi: 10.1016/j.coldregions.2008.06.004.

B. Su, N. Li, X. Quan, “The numerical study on the ventilated embankment in permafrost regions in Qinghai–Tibet railway”, Cold Regions Science and Technology 38(2–3) (2004) 229-238. doi: 10.1016/j.coldregions.2003.11.003.

Y. Hou, Q. Wu, F. Niu, Y. Liu, “Thermal stabilization of duct-ventilated railway embankments in permafrost regions using ripped-rock revetment”, Cold Regions Science and Technology 120 (2015) 145-152. doi: 10.1016/j.coldregions.2015.10.002.

Sun, Hong, Xiurun Ge, Dongpeng Zhu, Fujun Niu, and Jianbing Chen. “Numerical Investigation of the Temperature Field of a New Convection-Intensifying Composite Embankment in Permafrost Regions.” Journal of Cold Regions Engineering 33, no. 1 (March 2019): 06018001. doi:10.1061/(asce)cr.1943-5495.0000174.

M. Zhang, Z. Wu, J. Wang, Y. Lai, Z. You, “Experimental and theoretical studies on the solar reflectance of crushed-rock layers”, Cold Regions Science and Technology 159 (2019) 13-19. doi: 10.1016/j.coldregions.2018.10.012.

Y. Qin, J. Luo, Z. Chen, G. Mei, L.-E. Yan, “Measuring the albedo of limited-extent targets without the aid of known-albedo masks”, Solar Energy 171 (2018) 971-976. doi: 10.1016/j.solener.2018.07.043.

Y. Qin, J. Liang, Z. Luo, K. Tan, Z. Zhu, “Increasing the southern side-slope albedo remedies thermal asymmetry of cold-region roadway embankments”, Cold Regions Science and Technology 123 (2016) 115-120. doi: 10.1016/j.coldregions.2015.12.006.

Darrow, Margaret M., and David D. Jensen. “Modeling the Performance of an Air Convection Embankment (ACE) with Thermal Berm over Ice-Rich Permafrost, Lost Chicken Creek, Alaska.” Cold Regions Science and Technology 130 (October 2016): 43–58. doi:10.1016/j.coldregions.2016.07.012.

Lebeau, Marc, and Jean-Marie Konrad. “Non-Darcy Flow and Thermal Radiation in Convective Embankment Modeling.” Computers and Geotechnics 73 (March 2016): 91–99. doi:10.1016/j.compgeo.2015.11.016.

W. Pei, M. Zhang, S. Li, Y. Lai, L. Jin, “Enhancement of convective cooling of the porous crushed-rock layer in cold regions based on experimental investigations”, International Communications in Heat and Mass Transfer 87(Supplement C) (2017) 14-21. doi: 10.1016/j.icheatmasstransfer.2017.06.019

M. Zhang, Y. Lai, Q. Wu, Q. Yu, T. Zhao, W. Pei, J. Zhang, “A full-scale field experiment to evaluate the cooling performance of a novel composite embankment in permafrost regions”, International Journal of Heat and Mass Transfer 95(Supplement C) (2016) 1047-1056. doi: 10.1016/j.ijheatmasstransfer.2015.12.067.

S. Mindess, J.F. Young, D. Darwin, “Concrete, Pearson Eduction”, Upper saddle River, New Jersey, 2002.

F. Niu, X. Liu, W. Ma, Q. Wu, J. Xu, “Monitoring study on the boundary thermal conditions of duct-ventilated embankment in permafrost regions”, Cold Regions Science and Technology 53(3) (2008) 305-316. doi: 10.1016/j.coldregions.2007.07.004.

T. Niu, L. Chen, W. Wang, “REOF analysis of climatic characteristic of winter temperature and humidity on Xizang-Qinghai plateau”, Journal of applied meteorogogical science 13(5) (2002) 560-570.

S. Coulombe, D. Fortier, E. Stephani, “Using Air Convection Ducts to Control Permafrost Degradation under Road” Infrastructure: Beaver Creek Experimental Site, Yukon, Canada, Cold regions engineering 2012: Sustainable infrastructure development in a changing cold environment, ASCE, Quebec City, Canada, 2012, pp. 21-31. doi: 10.1061/9780784412473.003.

X. Duan, G.F. Naterer, “Heat transfer in a tower foundation with ground surface insulation and periodic freezing and thawing”, International Journal of Heat and Mass Transfer 53(11–12) (2010) 2369-2376. doi: 10.1016/j.ijheatmasstransfer.2010.02.003.

X. Chai, F. Jiang, “Deformation Characteristics of Ventiduct Embankment on Qinghai-Tibet Railway”, Journal of Cold Regions Engineering 22(4) (2008) 124-133. doi: 10.f1061/(ASCE)0887-381X(2008)22:4(124).


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DOI: 10.28991/cej-2019-03091327

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