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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Numerical analysis on thermal regime of wide embankment in permafrost regions of Qinghai-Tibet Plateau
MA Tao(马涛)1, TANG Tao(汤涛)1, HUANG Xiao-ming(黄晓明)1, WANG Hao(汪浩)2

1. School of Transportation, Southeast University, Nanjing 210096, China;
2. Department of Civil and Environmental Engineering, Rutgers, the State University of New Jersey, NJ08854, USA

Abstract:This study investigated the temperature field and thawing depth of wide embankment for expressway in permafrost regions based on numerical analysis by using finite element method (FEM). According to specific embankment section of Qinghai-Tibet highway, computational region for numerical analysis was defined. And numerical model was developed through FEM software named as ABAQUS and was verified by field observed data. The effects by width and height of embankment on the thermal regime of computational region were analyzed based on FEM modeling. Numerical analysis showed that embankment construction has serious disturbance on the thermal stability of ground permafrost showing as annual average ground temperature and the maximum thawing depth keeps increasing with service time increasing. And larger embankment width leads to poorer thermal stability and more serious uneven temperature field of embankment. Raising embankment height can improve the thermal stability; however, the improvement is restricted for wide embankment and it cannot change the degradation trend of thermal stability with service life increasing. Thus, to construct expressway with wide embankment in permafrost regions of Qinghai-Tibet Plateau, effective measures need to be considered to improve the thermal stability of underlying permafrost.

 

Key words: permafrost region; thermal stability; expressway; embankment

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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