In Situ Test on Cooling Effectiveness of Air Convection Embankment with Crushed Rock Slope Protection in Permafrost Regions
Publication: Journal of Cold Regions Engineering
Volume 19, Issue 2
Abstract
An experimental air convection embankment (ACE) was constructed in Beiluhe on the Qinghai-Tibet Plateau during 2001–2003, using coarse (5–8 and 40–50 cm), poorly graded crushed rock fill material on the slope of embankment with thick ground ice permafrost foundation, which should be called the air convection embankment with crushed rock slope protection (ACE–CRSP). The highly permeable ACE–CRSP installation was designed to test the cooling effectiveness of ACE–CRSP concept in an actual railway project. Ground temperature data were collected from test sections on the railway with thermistor sensor strings. The results showed that the mean ground temperature under the layer of the crushed rock with coarse particle diameter of 40–50 cm was lower than that under one with finer particle diameter of 5–8 cm, and the fluctuating range of temperature under the former was bigger than that under the latter. It was obvious that the maximum thaw depth was raised under the layer of crushed rock with coarse particle diameter of 40–50 cm, which resulted from the stronger cooling effectiveness of air convection during the winter. The amount of heat exchange also showed that the absorbed cooling energy of the foundation, under the layer of the crushed rock with coarse diameter, was larger than that with finer diameter.So, we believe that the cooling effectiveness of the crushed rock layer with coarse diameter was stronger than that one with finer diameter.
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Acknowledgments
This work was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX1-SW-04) and the National Natural Science Foundation of China (Grant No. 90102006) and the National Key Basic Research and Development Foundation of the Ministry of Sciences and Technology of China (Grant No. 2002CB412704).
References
Cheng, G. D. (2003). “Construction of Qinghai-Tibet railway with cooled roadbed.” China Railway Sci., 24(3), 1–4.
Goering, D. J. (1998). “Experimental investigation of air convection embankments for permafrost-resistant roadway design.” Proc., 7th Int.Conf. on Permafrost, Yellowknife, N.W.T., Canada, Laval Univ., Québec, Canada, 319–326.
Goering, D. J. (2003). “Passively cooled railway embankments for use in permafrost areas.” J. Cold Reg. Eng., 17(3), 119–133.
Goering, D. J., Instanes, A., and Knudsen, S. (2000). “Convective heat transfer in embankment ballast.” Ground freezing, Balkema, Rotterdam, The Netherlands, 31–36.
Goering, D. J., and Kumar P. (1996). “Winter-time convection in open-grade embankments.” Cold Regions Sci. Technol., 24(1), 57–74.
He, G. S., Ding, J. K., and Li, Y. Q. (2000). “Heat transmission properties and application of the dump filling crushed stone layer.” J. Glaciology Geocryology, 22(Supp.), 33–37.
Lai, Y. M., Li, J. J., Niu, F. J., and Yu, W. B. (2003a). “Nonlinear thermal analysis for Qing-Tibet Railway embankments in cold regions.” J. Cold Reg. Eng., 17(4), 171–184.
Lai, Y. M., Zhang, S. J., and Mi, L. (2004). “Effect of climatic warming on the temperature fields of embankments in cold regions and a countermeasure.” Numer. Heat Transfer, Part A, 45, 191–210.
Lai, Y. M., Zhang, L. X. and Zhang, S. J.(2003b). “Cooling effect of the ripped-stone embankment of the Qinghai-Tibet Railway under the condition of the global air temperature rising.” Chin. Sci. Bull., 48(3), 292–297.
Niu, F. J., Zhang, J. M., and Zhang, Z. (2002). “Engineering geological characteristics and their evaluations of permafrost in Beiluhe testing field of Qinghai-Tibet Railway.” J. Glaciology Geocryology, 24(3), 264–269.
Qin, D. H. (2002). Assessment on environment in west China, Science Press, Beijing, 55–60.
Rooney, J. W. (1997). “Rock fill embankment application for convective foundation cooling on the BAM Railway system.” Proc., 5th Int. Symp. on Cold Region Development, Alaska, 399–402.
Wang, G. S., Lin, Q., and Jin, H. J. (1996). “Experimental study on the quarried rock ventilated embankment in cold regions engineering.” Proc., 5th Chinese Conf. on Glaciology and Geocryology, Gansu Culture Press, Lanzhou, China, Vol. 1, 377–382.
Wu, Q. B., Liu, Y. Z., and Zhang, J. M. (2002). “A review of recent soil engineering in permafrost regions along Qinghai-Tibet Highway, China.” Permafrost Periglacial Processes, 13(3), 199–205.
Xu, X. Z., Wang, J. C., and Zhang, L. X. (2001). Frozen soil physics, Science, Beijing, 105–107.
Yang, H. R. (1985). “Measures for preventing thaw settlement of roadbed and improving its stability in permafrost regions.” J. Glaciology Geocryology, 7(1), 86–86.
Yu, W. B., Lai, Y. M., and Zhang, X. F. (2004). “Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions.” Cold Regions Sci. Technol., 38(1), 31–42.
Information & Authors
Information
Published In
Journal of Cold Regions Engineering
Volume 19 • Issue 2 • June 2005
Pages: 38 - 51
Copyright
© 2005 ASCE.
History
Received: Apr 12, 2004
Accepted: Jul 27, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
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