Heat stability analysis of embankment on the degrading permafrost districtin the East of the Tibetan Plateau, China

Citation
Dq. Li et al., Heat stability analysis of embankment on the degrading permafrost districtin the East of the Tibetan Plateau, China, COLD REG SC, 28(3), 1998, pp. 183-188
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
COLD REGIONS SCIENCE AND TECHNOLOGY
ISSN journal
0165-232X → ACNP
Volume
28
Issue
3
Year of publication
1998
Pages
183 - 188
Database
ISI
SICI code
0165-232X(199812)28:3<183:HSAOEO>2.0.ZU;2-I
Abstract
The heat stability of embankment in the degrading permafrost district of Ch ang Shitou Mountain in Hua Shixia Valley is modeled. Critical heights of em bankment for asphalt, concrete and gravel road surface along the National R oad of Qinghai-Sichuang are figured out by computers, according to the natu ral geographical and geological conditions of Hua Shixia Valley. The modele d results are in good agreement with the field data on the Qinghai-Xizang H ighway. The heat-stable critical heights of embankment for asphalt, concret e and gravel roads are figured out as 4.30, 1.40 and 1.00 m, in the 20th ye ar following construction from regression analysis. Besides according to th e calculation results, when the height of embankment is more than 5.0 m for asphalt road, there is an upper thawed core above the artificial permafros t table in embankment after more than 10 years following construction, alth ough the artificial permafrost table under the road is located above the na tural permafrost table in the whole process of road running. So the frost d eformation of embankment would be increased and could not reach the require ment of deformation designing. But for concrete and gravel road, there is n o upper thawed core in embankment (the heights of embankment are less than 5.0 m. Finally, the authors think that it is important that the running tim e after construction is introduced into the determination of the critical h eights of embankment in cold regions, particularly more important in degrad ing permafrost regions. (C) 1998 Elsevier Science B.V. All rights reserved.