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Laboratory Study on Cooling Effect of Crushed-Rock Embankment under Impermeable Boundary in Cold Regions
Crushed-rock embankment has been utilized as a method for avoiding thaw settlement of roadway in warm permafrost regions. Its cooling effect has been recognized. However, in field, the crushed-rock embankments are often covered by sand or snow. Therefore, to investigate the cooling effect of the crushed-rock embankment on the underlying soil in cold regions when it is fully covered, a case of porous media was examined through the laboratory test. The results show that the crushed-rock embankment with impermeable boundaries still has good cooling effect on the underlying soil, quality of alterable thermal conductivity, and thermal diode effect. Furthermore, by analyzing the changing correlation between the top temperature and the temperature difference through the top and bottom of the crushed-rock layer, taking consideration of the temperature fields in the crushed-rock embankments, we not only prove the existence of nature convection in the porous embankment but also find its convective law. Generally speaking, in highway/railway construction of permafrost regions, crushed-rock embankment can be an effective means for protecting the underlying permafrost even if it is covered by sand or snow.
Laboratory Study on Cooling Effect of Crushed-Rock Embankment under Impermeable Boundary in Cold Regions
Crushed-rock embankment has been utilized as a method for avoiding thaw settlement of roadway in warm permafrost regions. Its cooling effect has been recognized. However, in field, the crushed-rock embankments are often covered by sand or snow. Therefore, to investigate the cooling effect of the crushed-rock embankment on the underlying soil in cold regions when it is fully covered, a case of porous media was examined through the laboratory test. The results show that the crushed-rock embankment with impermeable boundaries still has good cooling effect on the underlying soil, quality of alterable thermal conductivity, and thermal diode effect. Furthermore, by analyzing the changing correlation between the top temperature and the temperature difference through the top and bottom of the crushed-rock layer, taking consideration of the temperature fields in the crushed-rock embankments, we not only prove the existence of nature convection in the porous embankment but also find its convective law. Generally speaking, in highway/railway construction of permafrost regions, crushed-rock embankment can be an effective means for protecting the underlying permafrost even if it is covered by sand or snow.
Laboratory Study on Cooling Effect of Crushed-Rock Embankment under Impermeable Boundary in Cold Regions
Zhang, I. M. (author) / Lai, Y. (author) / Li, S. (author)
13th International Conference on Cold Regions Engineering ; 2006 ; Orono, Maine, United States
2006-07-14
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2006
| British Library Conference Proceedings | 2006